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Taerkar
Dec 7, 2002

kind of into it, really

Myoclonic Jerk posted:

In it, the author said that, even if the US had lost Midway, the war was destined to end in Japanese defeat, just not as quickly. The US advantage in production of hulls and planes was so overwhelming, that the Japanese would have succumbed eventually. The author envisions a northern Pacific route through Canada and Alaska (:psyduck:) to support an invasion of Japan from the north, in which atomic bombs were not used, because production was diverted into building an even larger army and navy. IIRC, the invasion of Japan involved Soviet troops, resulting in a divided Japan and Tokyo, a la Germany.

IIRC most of the US Navy shipbuilding, especially of the large displacement hulls, was limited to the Eastern Seaboard and not the West Coast. If the US Pacific Fleet was crippled and Pearl Harbor isolated, then the IJN could have potentially struck the Panama Canal, resulting in the need for all USN ships to go around South America to get to the Pacific.

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ArchangeI
Jul 15, 2010

Taerkar posted:

IIRC most of the US Navy shipbuilding, especially of the large displacement hulls, was limited to the Eastern Seaboard and not the West Coast. If the US Pacific Fleet was crippled and Pearl Harbor isolated, then the IJN could have potentially struck the Panama Canal, resulting in the need for all USN ships to go around South America to get to the Pacific.

The Japanese had very severe fuel problems all throughout the war, sending KB to the Panama Canal would probably have been a one way trip.

Shattered Sword is really the best account of the battle, because it goes into ridiculous detail and disspells a great many myths about the battle. Like the battle being anywhere near close, or the Myth of Japanese superiority. There is even a part in about the decisiveness of the battle (spoiler: it wasn't all that decisive).

The whole battle was a clusterfuck for the Japanese from start to finish, and even taking midway wouldn't have improved their overall strategic position at all. The entire premise was flawed, with the Japanese plan basically assuming that the Americans would behave in the most stupid way possible. Hell, when they wargamed the operation beforehand, they ran through a scenario similar to the one that actually happened, and suffered crippling loses there as well. But they handwaved it away because "the Americans won't do that, seriously, now let me show you how we defeat their fleet in a nighttime surface action".

Nebakenezzer
Sep 13, 2005

The Mote in God's Eye

Acebuckeye13 posted:

Hey, I remember that book! I should dig it out and read it again sometime.

As to Japan, there's a good article by one of the authors of Shattered Sword as to how hosed Japan really was in regards to production disparity. The most telling statistic is merchant ship production-in the first four and a half months of 1943, the US built more merchant shipping than Japan did throughout the entire war. It's absolutely ridiculous.

Many of the sunk Midway carriers the IJN had (like the Akagi) started as merchant ship hulls, and where later converted to carriers. Carrier doctrine for the Japanese emphasized speed and firepower, at the cost of damage control.

John Ford was mentioned by iyaayas. Dude was actually on Midway Island during the battle, and was actually wounded there. He was up in a water tower getting footage of a IJN air attack when he was hit by shrapnel. I mention this because he was one of the biggest directors in Hollywood, who I think had already won academy awards, and, well, I can't really picture most Hollywood types today volunteering to go to the Island where the Japanese were about to invade.

Taerkar posted:

IIRC most of the US Navy shipbuilding, especially of the large displacement hulls, was limited to the Eastern Seaboard and not the West Coast. If the US Pacific Fleet was crippled and Pearl Harbor isolated, then the IJN could have potentially struck the Panama Canal, resulting in the need for all USN ships to go around South America to get to the Pacific.

The Japanese already had a plan to do this. They were going to build a small fleet of submarine aircraft carriers to attack the eastern portion of the Panama canal. They had good intelligence as to where to strike as well; a captured marine told them about the lightness of the defenses on the eastern side. The target would have been a specific loch that would have drained an artificial lake, rendering the canal unusable for 6 months to a year.

Since I'm already kinda king sperg in the other thread, let me just say the I-400 series of submarines was really cool and in some ways groundbreaking, and here's a PBS documentary on them.

Phanatic
Mar 13, 2007

Please don't forget that I am an extremely racist idiot who also has terrible opinions about the Culture series.

quote:

Also, I'd be extremely leery of any claims being made wrt RPG-7s scoring penetrating kill shots on M1s. I've only read of a few M1s being disabled by shots to the rear.

There was a big report on the one I mentioned. RPG went in one side, and out the other, it left a smear of copper across the gunner's jacket, he said it felt like someone thumped him from behind with a sledgehammer. Here's a reprint of the Army Times article:

http://www.rense.com/general44/what.htm

Consensus since then is that it's not that much of a mystery, it's just an advanced RPG warhead like the 7VL, not the older PG-7. The M1's frontal armor's supposed to be like 1600mm RHA-equivalent vs. HEAT, but there's still plenty of area that's protected by basically RHA backed up by a Kevlar spall liner.

KYOON GRIFFEY JR
Apr 12, 2010



Runner-up, TRP Sack Race 2021/22

Snowdens Secret posted:

I understand it was the first battle fought beyond line of sight, and this question is obvious nonsense along the lines of "who would win a fistfight between Napoleon and Hitler", but why would you say Midway was more significant than Salamis, Lepanto or Trafalgar?

Lepanto was not all that significant in some ways because it did not fundamentally alter the balance of power in the Med. It prevented one immediate invasion, but Ottoman naval strength recovered in an incredibly short period of time.

Zorak of Michigan
Jun 10, 2006


Nebakenezzer posted:

Many of the sunk Midway carriers the IJN had (like the Akagi) started as merchant ship hulls, and where later converted to carriers. Carrier doctrine for the Japanese emphasized speed and firepower, at the cost of damage control.

They were converted from warships, not merchant ships. IIRC Akagi was a battlecruiser and Kaga a battleship as laid down. The point is valid, though, and the descriptions of Japanese damage control and survivability features in Shattered Sword make it clear that the IJN just didn't get it.

priznat
Jul 7, 2009

Let's get drunk and kiss each other all night.
By taking damage you are a failure and should just die of shame.

SgtMongoose
Feb 10, 2007

My favorite is how the IJN thought ASW was just something those cowards and failures in England and the US did, and was totally unnecessary and beneath their brave samurai sailors.

Nebakenezzer
Sep 13, 2005

The Mote in God's Eye

Zorak of Michigan posted:

They were converted from warships, not merchant ships. IIRC Akagi was a battlecruiser and Kaga a battleship as laid down. The point is valid, though, and the descriptions of Japanese damage control and survivability features in Shattered Sword make it clear that the IJN just didn't get it.

Oops, yeah, my mistake.

mikerock
Oct 29, 2005

SgtMongoose posted:

My favorite is how the IJN thought ASW was just something those cowards and failures in England and the US did, and was totally unnecessary and beneath their brave samurai sailors.

What? Didn't the US lose a lot of subs to the Japanese?

LP97S
Apr 25, 2008

Cyrano4747 posted:

poo poo, T34s, even up-gunned and armored ones like the 34/85, were easy prey for Panzerfausts in WW2, and those were just way early generation disposable RPGs. Soviet armor losses from all the Panzerfausts being cranked out and dispersed among infantry and Volksturm were really, really terrible. Read any account of soviet tankers from '44-45 and they all mention how their buddies were getting killed off left and right by random assholes popping up out of bushes and rubble with those things.

As for the "who the gently caress still uses the T34?" argument, they saw some limited use in the Yugoslavian Civil War as well. There are tons of ex-warsaw pact nations that had them on 2nd line detail as of the collapse of the Soviet Union, although I imagine by now most of those have been sold off or turned into monuments or whatever.

They're basically the m91/30 of the tank world. If you want to own real-deal armor a decommissioned T34 is one of the cheaper ways to do it. THere's a reason why half the time you see a non-American tank in any movie it's either a T34 variant or a T34 with a body kit slapped onto it. Remember the Tiger from Saving Private Ryan? T34.

The T-34/85 was improved over the years and saw two major refurbishing programs in 1960 and 1969 from the Soviet Union and the Warsaw Pact. According to wikipedia, these were the major changes in the 60/69 refurbishments:

Model 1960 - A refurbishing program introduced a new V-2-3411 engine and an improved air cleaner, a cooling and lubrication system, a battery generator, new BDSh smoke canisters, an infrared headlight, a driver's sight and a 10-RT radio set instead of the old 9-R.

Model 1969 (also called T-34-85M) - This was a refurbishing program introducing the new R-123 radio set, 'starfish' roadwheels from the T-54 tank, night driving equipment, drivetrain improvements, repositioned or removed smoke canisters to make a space for additional 200-litre external fuel tanks and a ditching beam at the rear. An external fuel pump was added to ease refueling.

Those are significant additions to a tank that is 20-29 years old and has easily been out-classed by current production. The Soviets expected to get hit hard and they wanted every thing that could be thrown at the enemy with a reasonable chance of surviving.

As for use outside of the Soviet Union, the tanks were used by the Cypriot National Guard during the Greek backed Coup and ensuing Turkish Invasion of Cyprus.







Six years later, they were used by Vietnam to try to slow the Chinese during the Sino-Vietnamse War where they were not that successful with just the T-34.

Vietnamese T-34/85 for example.


One that was destroyed by Chinese forces


As mentioned earlier, the T-34 (in addition to the M4 Sherman for complete lunacy) was used during the Yugoslav Wars.





And an possible attempt to slow down HEAT and RPG rounds.

LGD
Sep 25, 2004

SgtMongoose posted:

My favorite is how the IJN thought ASW was just something those cowards and failures in England and the US did, and was totally unnecessary and beneath their brave samurai sailors.

Given how unimaginably lovely the US torpedoes were before about mid 1943 I think it is understandable that it wasn't a real point of emphasis.

Invalido
Dec 28, 2005

BICHAELING

LP97S posted:

And an possible attempt to slow down HEAT and RPG rounds.
I could see it done as and act of desperation, but in realiy rubber mats would probably only add any real crew protection on the inside inside of the tank as an anti-spalling liner.
In the context of the war in question this might have been a non-issue, but that actually looks pretty well suited for masking the infrared signature of the vehicle.
edit:looked again, saw the tires. It's probably to mess with the standoff distance of the RPG warheads, making them less effective...

Invalido fucked around with this message at 22:33 on Jun 4, 2012

SgtMongoose
Feb 10, 2007

LGD posted:

Given how unimaginably lovely the US torpedoes were before about mid 1943 I think it is understandable that it wasn't a real point of emphasis.

Here's some wiki concerning this.

Wikipedia posted:

In 1942 and early 1943, US submarines posed little threat to Japanese ships, whether warships or merchant ships. They were initially hampered by poor torpedoes, which often failed to detonate on impact, ran too deep, or even ran wild. As the US submarine menace was slight in the beginning, Japanese commanders became complacent and as a result did not invest heavily into ASW measures or upgrade their convoy protection to any degree to what the Allies in the Atlantic did. Often encouraged by the Japanese not placing a high priority on the Allied submarine threat, US skippers were relatively complacent and docile compared to their German counterparts, who understood the "life and death" urgency in the Atlantic.

However, US Vice Admiral Charles A. Lockwood pressured the ordnance department to replace the faulty torpedoes; famously when they initially ignored his complaints, he ran his own tests to prove the torpedoes' unreliability. He also cleaned out the "deadwood", replacing many cautious or unproductive submarine skippers with younger (somewhat) and more aggressive commanders. As a result, in the latter half of 1943, US subs were suddenly sinking Japanese ships at a dramatically higher rate, scoring their share of key warship kills and accounting for almost half of the Japanese merchant fleet. Japanese naval command was caught off guard, as they had not the anti-submarine technology or doctrine, nor did the production capability to withstand a tonnage war of attrition, nor did they develop the organizations needed (unlike the Allies in the Atlantic).

Japanese antisubmarine forces consisted mainly of their destroyers, with sonar and depth charges. However, Japanese destroyer design, tactics, training, and doctrine emphasized surface nightfighting and torpedo delivery (necessary for fleet operations) over anti-submarine duties. By the time Japan finally developed a destroyer escort which was more economical and better suited to convoy protection, it was too late; coupled to incompetent doctrine and organization,[23] it could have had little effect in any case. Late in the war, the Japanese Army and Navy used Magnetic Anomaly Detector MAD) gear in aircraft to locate shallow submerged submarines. The Japanese Army also developed two small aircraft carriers and Ka-1 autogyro aircraft for use in an antisubmarine warfare role.

The Japanese depth charge attacks by its surface forces initially proved fairly unsuccessful against U.S. fleet submarines. Unless caught in shallow water, a U.S. submarine commander could normally escape destruction, sometimes using temperature gradients (thermoclines). Additionally, IJN doctrine emphasized fleet action, not convoy protection, so the best ships and crews went elsewhere.[24] Moreover, during the first part of the war, the Japanese tended to set their depth charges too shallow, unaware U.S. submarines could dive below 150 feet (45m). Unfortunately, this deficiency was revealed in a June 1943 press conference held by U.S. Congressman Andrew J. May, and soon enemy depth charges were set to explode as deep as 250 feet (76m). Vice Admiral Charles A. Lockwood, COMSUBPAC, later estimated May's revelation cost the navy as many as ten submarines and 800 crewmen.[25][26]

LGD
Sep 25, 2004

Yeah, I'm not saying that Japanese ASW doctrine wasn't very flawed. But you're not giving them enough credit by ascribing those shortcomings to some sort of cultural blindness- the Allied ASW doctrine and capabilities weren't at all good at the war's outset and only turned German submarines into total deathtraps by the later years of the war through a long process of refinement. And that refinement only happened because German submarines were a real and obvious threat to shipping in the Atlantic. On the other hand, Japan never really had to confront or re-examine any deficiencies in their ASW doctrine or capabilities for the first few years of the war because the initial Mark 14 torpedo design was so bad that a USN submarine unloading what should have been an egregious amount of ordnance in ideal conditions was very unlikely to do more than superficial damage to any target. Now with hindsight it was clearly something that they should have taken much more seriously, but given the extreme ineffectiveness of American submarines for the first couple years of the war in the Pacific there really doesn't seem to be anything surprising or unusual about the Japanese not pouring a ton of resources into improving their ASW capabilities.

KYOON GRIFFEY JR
Apr 12, 2010



Runner-up, TRP Sack Race 2021/22

SgtMongoose posted:

My favorite is how the IJN thought ASW was just something those cowards and failures in England and the US did, and was totally unnecessary and beneath their brave samurai sailors.

The US sucked at ASW initially as well, and in the face of much more effective opposition, so it's not like the IJN had a unique complex regarding ASW at least at the initial stages of the war. Note Adm. Ernest King.

edit: LGD you mother fucker

NerdyMcNerdNerd
Aug 3, 2004
There is a fairly interesting book titled Take Her Deep that goes into American submarine warfare during WW-2. The author covers his own submarine service from August 1943 to November 1944. The book does a great job of talking about the tactics, equipment, and events of the US submarine war without getting dry or boring.

wkarma
Jul 16, 2010

Veins McGee posted:

Bradleys MIGHT have killed a few t-55s at close range with the 25mm but, more likely, they were TOW kills. T-34s wouldn't be much of a challenge for Bradley; the armor is thin enough to be penetrated by 25mm, the armor is inferior, and the firecontrol is obsolete.

Also, I'd be extremely leery of any claims being made wrt RPG-7s scoring penetrating kill shots on M1s. I've only read of a few M1s being disabled by shots to the rear.

I've had a bradley gunner specifically tell me that T-72's were engaged and destroyed with APDS (M791 I believe) 25mm in Gulf 1. Quick internet sleuthing seems to support this statement of several T-72 kills by 25mm to the side hull armor, and all aspect kills (especially to the turret ring on the front) to T-55/65, even from medium ranges. OIF saw the introduction of M919 APFDS which is supposedly even better.

wkarma fucked around with this message at 00:03 on Jun 5, 2012

Nebakenezzer
Sep 13, 2005

The Mote in God's Eye

The carrier Taiho was the first carrier the Japanese constructed during WW2, and apparently was the first carrier designed by them to 'take damage and continue fighting.' Anyhoo, at the battle of the Philipeene Sea in '44 Taiho takes a single torpedo hit. The hit fractures the aviation fuel tank, and flooded the forward elevator well with a mixture of water and gasoline. Other than that, the hit was superficial, and Taiho continued operations.

An Osprey book on Jap Aircraft carriers posted:

However, the single torpedo had cracked the aviation fuel tanks in the area of the
forward elevator and caused gasoline to mix with water in the elevator well. The crew's response demonstrated the uneven standard of damage-control training in the Imperial Navy. All hangar doors and hatches were opened, increasing the
spread of vapor fumes. The damage-control officer switched on all fans
throughout ship, turning the ship into a floating bomb.Just over six hours
after being torpedoed, a huge explosion took place that buckled the flight
deck upwards and blew out the sides of the hangar. The explosion also
ruptured the hull and caused a loss of power. Unable to fight the fires, the
ship became a raging inferno and sank with a third of its crew.

vains
May 26, 2004

A Big Ten institution offering distance education catering to adult learners

wkarma posted:

I've had a bradley gunner specifically tell me that T-72's were engaged and destroyed with APDS (M791 I believe) 25mm in Gulf 1. Quick internet sleuthing seems to support this statement of several T-72 kills by 25mm to the side hull armor, and all aspect kills (especially to the turret ring on the front) to T-55/65, even from medium ranges. OIF saw the introduction of M919 APFDS which is supposedly even better.

25mm penetrates, at most, <90mm of RHA. M919 penetration values aren't released AFAIK but its probably not going to push that penetration number up too much further. I feel like if 25mm could reliably kill T-72s, I would have heard about it at some point.

"There have even been reports of kills against Iraqi T-72 tanks at close range.[citation needed]"-wikipedia

Frozen Horse
Aug 6, 2007
Just a humble wandering street philosopher.

LGD posted:

Given how unimaginably lovely the US torpedoes were before about mid 1943 I think it is understandable that it wasn't a real point of emphasis.

To help you imagine:

wikipedia posted:

...Inexplicably, no live fire trial was ever done. ... A service manual for the exploder "was written—but, for security reasons, not printed—and locked in a safe."

In 1923, Congress made NTS Newport the sole designer, developer, builder and tester of torpedoes in the United States. No independent or competing group was assigned to verify the results of Mark 14 tests. NTS produced only 1½ torpedoes a day in 1937, despite having three shifts of three thousand workers working around the clock. Production facilities were at capacity and there was no room for expansion. Only two thousand submarine torpedoes were built by all three Navy factories in 1942. This exacerbated torpedo shortages; the Pacific Fleet Submarine Force had fired 1,442 torpedoes since war began.

The Mark 14 was central to the torpedo scandal of the US Pacific Fleet Submarine Force during World War II. Due to inadequate Depression-era peacetime testing of this torpedo and its Mark VI exploder, it had defects that tended to mask each other. Indeed, much of the blame commonly attached to the Mark 14 correctly belongs to the Mark VI exploder. These defects, in the course of fully twenty months of war, were exposed, as torpedo after torpedo either missed, prematurely exploded, or struck targets (sometimes with an audible clang) and failed to explode.

The Mark 14 had four major flaws.

It tended to run about 10 feet (3.0 m) deeper than set.
The magnetic exploder often caused premature firing.
The contact exploder often failed to fire the warhead.
It tended to run "circular", failing to straighten its run once set on its prescribed gyro-angle setting, and instead, to run in a large circle, thus returning to strike the firing ship.

This is truly the worst torpedo, but it couldn't have gotten there without near-criminal levels of incompetence and arrogance from the Bureau of Ordinance, which kept insisting that it was adequately tested and a good design.

Insert name here
Nov 10, 2009

Oh.
Oh Dear.
:ohdear:

Frozen Horse posted:

To help you imagine:


This is truly the worst torpedo, but it couldn't have gotten there without near-criminal levels of incompetence and arrogance from the Bureau of Ordinance, which kept insisting that it was adequately tested and a good design.
From the same link:

quote:

Uniquely, Lieutenant Commander John A. Scott in Tunny on 9 April 1943 found himself in an ideal position to attack aircraft carriers Hiyo, Junyo, and Taiyo. From only 880 yd (800 m), he fired all ten tubes, hearing all four stern shots and three of the bow's six explode. No enemy carrier was seen to diminish its speed, though Taiyo was slightly damaged in the attack. Much later, intelligence reported each of the seven explosions had been premature; the torpedoes had run true but the magnetic feature had fired them too early.
Dude must have been pissed to see an opportunity like that slip away.

Acebuckeye13
Nov 2, 2010
Ultra Carp
American Torpedoes during the early part of the war were just a never-ending string of failure and misery. Every time they "Fixed" a problem, it just revealed more issues, to the point where dropping one from a crane didn't trigger the detonator. The whole process was just absolutely insane.

Edit: Actually, I'm just going to copy a post I made in the Military History thread in A/T (Which itself was just a copy of two posts made by others in the old GBS History thread)

gradenko_2000 posted:

I could write a book on faulty WW2 torpedoes.

The gyroscope thing is actually a two-stage series of mishaps:

The first is a circular-running torpedo. As you described, torpedoes would have gyroscopes fitted to them so that subs could make off-angle torpedo shots. You'd program a certain heading for the torpedo to take, and the torp would turn to the new angle a few seconds after being shot out the tube.

The problem was that sometimes the gyroscope would not work correctly and so would never tell the torpedo to stop turning, hence being called a circular running torpedo since it would go around in circles. Since submarines tend to move rather slowly (at least relative to the torpedo) when submerged and making attacks, this can be deadly.

Here's where my content begins: In order to solve the problem of circular running, designers attached a SECOND gyroscope to torpedoes. If the second gyro measured a heading that exceeded the programmed turn by 15 degrees or more, the torpedo would self-destruct.

That would solve the problem completely, right? It would, except for the fact that sometimes, torpedoes would fail to shoot from their tubes correctly. Whenever this happened, the sub captain would just order the torpedomen to not touch the tube at all until the end of the patrol.

However, another US submarine was lost after the introduction of the second self-destruct gyro because one of their torpedoes failed to eject from the tube properly during a spread shot, and the submarine then began a turn for evasive action. Since the torpedo was still in the sub, and the sub turned 15 degrees beyond its original heading, the second gyro thought it was in a circular run and triggered the self-destruct, while it was still inside the torpedo tube.

And then of course the problems with magnetic detonators would have to take up a few chapters themselves:

In the beginning, most torpedoes used contact detonators. They'd have a 'pin' at the very front tip of the torpedo that would depress when the torpedo hits a solid object (preferably at a right angle), and the torpedo would explode. In fact, this is how most movies depict torpedo hits.

The problem with this approach is that it's wasteful. So much of your energy is being wasted as it channels 'up' out of the water, as in the big splash of water during when you see those movie-torpedoes.

The solution was to exploit the unique property of water. It's incompressible. If you exert force on a sponge, it shrinks. If you exert force on water, it just moves out of the way. If it can't move out of the way, something else has to.

Therefore, if you detonate a torpedo BELOW a ship, then the water, being incompressible, will instead 'push' the ship. Since your explosion is small relative to the ship, only a small part of the ship will be pushed up. As it gets pushed up, the weight of the opposite ends of the ship will bear down on the small portion affected by the torpedoes explosion. In effect, the ship breaks its own back.

Only, how do get a torpedo to detonate BELOW a ship? Answer: Magnets! Rig a magnet to the head of a torpedo, and when it passes under the great metal mass of a ship, the magnet should detect a great change in the magnetic field. Attune the detonator to the magnet, and you'll theoretically have something that blows up when it passes under a ship.

The problem was that both the German and American Navies did their testing without taking into account the effect of the magnetic field exerted by the EARTH. The Americans tested theirs in Narangasett Bay in Rhode Island, which meant that when they were fighting in the equatorial areas of the Pacific Theater, the magnetic influence was only half as powerful as it was relative to the tests. As a result, most of the torpedoes either detonated early, or never detected a sufficient change and just sailed right under the ships.

The Germans had a slightly different problem - when they deployed their U-Boats to interdict British ships during their invasion of Norway, they found that their torpedoes kept detonating early, even though it seemed to work just fine everywhere else. The issue? Iron deposits. In the shallow waters of the Norwegian Sea, clumps of iron below the sea floor exerted a powerful enough change in the magnetic field that it caused the torpedoes to detonate as it sailed above them. It got so bad that even the best U-Boat aces just up and refused to take shots during the 1940 campaign until the kinks in the system were worked out.

quote:

I cannot believe there's no youtube video of the Konovalov being struck by her own torpedo. "You arrogant rear end in a top hat! You've killed us!"

A similar situation actually happened with the German's first-generation acoustic-homing torpedoes. They were supposed to travel straight for about 400 meters, then turn towards the noisiest target it could hear.

The problem was that if you're shooting at bunch of transports plodding along at 7 to 10 knots nearly a klick away, and your own sub is making waves taking evasive action, the torpedo is going to recognize YOU as the noisier target. The results are rather obvious.

The Germans then determined that it was only prudent to use these particular torpedoes against the faster running convoy escorts such as Destroyers or Corvettes, and even then only when they're moving faster than 15 knots.

http://en.wikipedia.org/wiki/HMS_Gotland_(Gtd)#cite_note-9

As a final note, there's also the story of the HMS Gotland, a Swedish diesel-electric submarine that managed to get close enough to the USS Ronald Reagan to snap some pictures of it through its periscope, effectively signifying that the carrier could have been sunk if it was a live-fire exercise.

Maybe next time I'll post about the problems the US Navy had with its contact detonators.

Phanatic posted:

It's amazing to me that nobody went to jail over how awful American torpedoes were in WWII. The air-dropped Mark 13 mentioned above was consistently miserable until late in the war; one exercise in 1941 dropped 10 torpedoes, only one of which worked properly (four out of the ten just sank). A survey done in 1943 found that of 105 dropped at speeds > 150 knots, only 31% worked properly; 36% of them didn't even run. And the Mark 13 wasn't the worst torpedo.

The really really lovely one was the Mark 14/Mark 15 (basically the same design, the 14 was sub-launched, the 15 was launched from destroyers. This was a new! and improved! design replacing the old WWI-era Mark 10. It had a fancy-schmancy magnetic detonator, so that it could explode under the keel of the target ship, doing much more damage than one that runs straight into the side and explodes in contact. And it was totally loving useless. Seriously, not an exagerration, the thing didn't work at all.

See, the same government base, the Newport Torpedo Station, was by act of Congress the only developer, manufacturer, and tester of torpedoes in the entire country, with no third-party evaluation of testing processes or results whatsoever. No full live-fire test of the mark 14 was ever performed; there were trial firings, but none involved actual warheads.

Then we went to war, and then all the sub commanders started to realize that the torpedoes were poo poo almost immediately. In December of '41, USS Sargo fires 8 at two Japanese merchantmen, none hit. The captain finds another two merchantmen, spends an hour making sure the targeting computer's results match perfectly with the pencil-and-paper trigonometry results, and fires four more torpedoes, none hit. A few days later he fires another one at a big-rear end slow-as-hell tanker, another miss. USS Seadragon has an almost identical experience: 8 torpedoes fired, only one hit. In 1943, the USS Tunny sets up an attack on three Japanese carriers, firing 10 torpedoes. 7 of them actually explode, but none of the carriers are damaged.

Probably the single most egregious example was when USS Tinosa tried to sink a Japanese factory whaling ship. They hit the thing with two fish (out of 4), stopping it dead in the water. Then the captain maneuvered to only 800 yards off her beam, and methodically fired 9 more torpedoes, tracking each one through the periscope. Every single one was a dud. He saved his last torpedo so it could be analyzed, and sailed back to base pissed as gently caress. In another almost-identical experience, USS Haddock stops a big tanker with 2 hits, and then puts another 11 torpedoes into her, all of which fail to explode.

The unanimous opinion of sub commanders that the things didn't loving work led eventually to an Bureau of Ordnance investigation. Sort of.

The design actually had several different problems, but each problem made it harder to find the other. First problem is that the thing ran too deep; remember, there were no true live-fire tests done, and during testing the torpedo had a dummy warhead made of concrete, which was lighter than the actual warhead. And then later on, the warhead was replaced with a heavier one. Bottom line was that the thing would just run too far under the target ship for the magnetic detonator to sense the hull and detonate the warhead. Sub skippers just started setting the things to run at zero depth so that at *least* they'd run shallow enough to hit the target, and the Bureau of Ordnance concluded that the testing and design of the depth mechanism was inadequate. So subs started getting more hits.

But not getting more *kills*. Fixing the depth problem just revealed more problems. The magnetic detonator on the Mark VI fuse was also screwy, typically being too sensitive, so the warhead would explode too early and do minimal or no damage to the target. The Navy flat-out refused to believe that anything could possibly be wrong with this high-tech $10,000 device. During that investigation, the government investigator sabotaged one of the loving torpedoes that was used during the trial! He reversed its gyroscope, which meant it wouldn't run straight, and then blamed that fault on the maintenance crew on the sub it came from. Sub skippers started ordering the magnetic feature deactivated on all their torpedoes, so now at *least* they'd run straight into the sides of the target and detonate using the conventional contact fuse. But then they started getting more duds.

Because the contact fuse also sucked. In one test, they dropped 10 torpedoes from a 90' crane, and 7 of them failed to go off. The firing mechanism of the Mark VI was so massive and had so much inertia that a straight-on hit (which everyone was trained to try to achieve) resulted in it bending, jamming, and otherwise failing to fire. Once this was discovered, they started aiming for lower-angle hits, and the fuses began to be remanufactured with lighter, aluminum components.

By the end of the war, it was a fairly-reliable design. So was the Mark 13. The planned replacement for the Mark 14, the Mark 18, was an all-electric design that *also* sucked. It was a copy of a German design, and had the promised advantage of not leaving a bubble trail, so it would be harder to spot and not point the way back to the launch point. But the batteries were weak and had to be recharged frequently, it was slow, it tended to damage itself just being launched, and had no mechanism to protect against a circular run; the USS Tang, the most successful US sub ever, was sunk by one of its own Mark 18s.

Here's a lot more depth on how hosed-up the Mark 14 really was and why:

http://www.ibiblio.org/hyperwar/USN/Admin-Hist/BuOrd/BuOrd-6.html

Acebuckeye13 fucked around with this message at 04:08 on Jun 5, 2012

Party Plane Jones
Jul 1, 2007

by Reene
Fun Shoe

Acebuckeye13 posted:

Edit: Actually, I'm just going to copy a post I made in the Military History thread in A/T (Which itself was just a copy of two posts made by others in the old GBS History thread)

Here's what Oberleutenant had to say about the German magnetic detonators:

quote:

As expected, the Norwegian seas were filled with Allied ships. Almost immediately, the U-boats began attacking. Every day and every hour, U-boats were attacking warships or were being attacked themselves. Day in, day out, night after night, the U-boats fired their torpedoes one after another, relentlessly against their targets. Not one of them exploded. Their efforts remained completely fruitless. Worse yet, when the data was analyzed back at BdU, it was found that four attacks were launched on the battleship HMS Warsprite, fourteen on cruisers, ten on destroyers, and a further ten on transports – yet only one transport was sunk. Discounting marginal attacks, Donitz concluded that had the torpedoes not failed, the U-boats would have “probable sinkings” of one battleship, seven cruisers, seven destroyers, and five transports. In summary, about twenty enemy warships had escaped certain destruction because of torpedo failures.

By the end of the Norwegian campaign, the men of the U-boat Force had lost all faith in their torpedo and had not much heart to resume the fight. On April 19, Prien refused to attack when he spotted a convoy of ten transports and several destroyers. He still had four torpedoes left, but had so little faith in them that he sailed away silently. Upon his return, in explaining his refusal to attack, he told Donitz that he “could hardly be expected to fight with a dummy rifle”.

Owing to torpedo failures, on April 26, Grand Admiral Raeder released the U-boat Force from Norwegian operations. Meanwhile, design flaws were being discovered back at the Torpedo Directorate. Often times, when a problem was discovered and corrected, other new problems were uncovered as a result of the fix. Problems fell into three main categories: contact detonator, magnetic detonator and depth keeping ability.

The contact detonator used during the First World War was simple and reliable. After the war, the detonator had been completely redesigned to transfer the impact of the blow backwards through a series of complicated levers. In theory, it was supposed to provide a wide impact angle of 69 degrees to perpendicular. However, in practice, this was closer to 40 degrees. The new design had been tested only twice and that too with mixed results. As a result, the contact detonator was replaced with a much simpler design, mainly influenced by British technology captured from the submarine HMS Seal.

The magnetic detonator however proved to be immune to simple fixes. It was supposed to detonate when it passed underneath a ship’s keel, as it was triggered by a sudden change in magnetic fields. This did not work as intended as the British had found a way to reduce a ship’s magnetic field by degaussing. Additionally, the earth’s magnetic fields also varied at different geographical locations and were influenced by iron ore deposits beneath the sea bed. Only when the completely redesigned Pi2 detonator had been introduced in December 1942, the problems of magnetic detonator continued to plague the U-boat Force.

But even if the detonators had been working flawlessly, problems with depth keeping meant that torpedoes were running two to three meters too deep. The depth keeping device worked by using an atmospheric chamber which controlled running depth. The Torpedo Directorate conducted new tests and could not discover any flaws. This occurred because the test torpedoes were launched from normal atmospheric conditions. But since atmospheric pressure inside a U-boat varied greatly, especially after prolonged submerged activity, air would leak into the torpedo chamber, effectively recalibrating the depth sensor.

Years would pass before a fairly reliable torpedo design could be developed. By then, advances in Allied technology had made it far more difficult to deliver torpedoes to their target.

As a result of the torpedo scandal, several top officials of the Torpedo Directorate were court martialed for negligence in duties. Donitz would write in his memoirs, “For the lessons one fails to learn during peacetime, one pays a high price in war”.

“I do not believe that ever in the history of war, men have been sent against the enemy with such a useless weapon” - Karl Donitz

Basically, the only nation that started the war with a world-class fully functioning torpedo were the Japanese. But that was hampered by how incredibly deadly and volatile they were. A single 5 inch shell from the Samuel B. Roberts, a destroyer escort, hit the torpedoes on the heavy cruiser Chokai, causing enough damage that it had to be scuttled the following day.

iyaayas01
Feb 19, 2010

Perry'd

Zorak of Michigan posted:

They were converted from warships, not merchant ships. IIRC Akagi was a battlecruiser and Kaga a battleship as laid down. The point is valid, though, and the descriptions of Japanese damage control and survivability features in Shattered Sword make it clear that the IJN just didn't get it.

Similar to the Lady Lex and Sara in that the Washington Naval Treaty is what drove the conversion, since each signatory was allowed to convert two in-construction capital ship hulls to carriers instead of scrapping them.

Party Plane Jones posted:

A single 5 inch shell from the Samuel B. Roberts, a destroyer escort, hit the torpedoes on the heavy cruiser Chokai, causing enough damage that it had to be scuttled the following day.

Well, she was the destroyer that fought like a battleship...

Snowdens Secret
Dec 29, 2008
Someone got you a obnoxiously racist av.

Party Plane Jones posted:

Basically, the only nation that started the war with a world-class fully functioning torpedo were the Japanese. But that was hampered by how incredibly deadly and volatile they were. A single 5 inch shell from the Samuel B. Roberts, a destroyer escort, hit the torpedoes on the heavy cruiser Chokai, causing enough damage that it had to be scuttled the following day.

I thought the ones surface ships used, particularly the PT boat torpedos (British Mk 8s?) were supposed to be pretty good.

In all honesty torpedos are not troublefree weapons, the Mk 37 would hot run / catch fire (sinking the Scorpion), the Spearfish sucked. Although reading in this thread about the reliability of AMRAAMs and other A-A missiles has been a bit of an eye opener in terms of the reliability of guided weapons in general.

quote:

A similar situation actually happened with the German's first-generation acoustic-homing torpedoes. They were supposed to travel straight for about 400 meters, then turn towards the noisiest target it could hear.

The problem was that if you're shooting at bunch of transports plodding along at 7 to 10 knots nearly a klick away, and your own sub is making waves taking evasive action, the torpedo is going to recognize YOU as the noisier target. The results are rather obvious.

We had a range torpedo do this to us, it was disconcerting

daskrolator
Sep 11, 2001

sup.
For better or worse the saga of the mark 14 is still used as a prime example of the caution of reverting back to an arsenal model.

evil_bunnY
Apr 2, 2003

Cyrano4747 posted:

edit: it also helps that Midway is a battle where, on paper, the US should have had it poo poo shove in. I don't know how true this is or not, but I've heard from more than one source that it's a favored scenario at USN tabletop wargames and that the side assigned the US has yet to win it since the actual battle.
On paper before you consider crypto failures maybe. Once you take that into account, you have the US basically knowing what where and when to expect from the imperial fleet, who was advancing blind as a bat.

Phanatic
Mar 13, 2007

Please don't forget that I am an extremely racist idiot who also has terrible opinions about the Culture series.

evil_bunnY posted:

On paper before you consider crypto failures maybe. Once you take that into account, you have the US basically knowing what where and when to expect from the imperial fleet, who was advancing blind as a bat.

They knew *generally* where, the little cryptography trick that let them identify Midway as the focus of the Japanese force isn't anywhere near enough to let you launch a raid against the carriers. *Finding* the Japanese fleet was actually a very close thing.

Crypto's nice, but take a look at the Battle of Crete. The German invasion plans were an open book. The British knew exactly when and where they'd be attacking with what forces, and still managed to gently caress up enough to lose.

Keegan's got a good treatment of this: http://www.amazon.com/Intelligence-War-value-limitations-military/dp/0375700463/ref=pd_sim_b_1

iyaayas01
Feb 19, 2010

Perry'd

evil_bunnY posted:

On paper before you consider crypto failures maybe. Once you take that into account, you have the US basically knowing what where and when to expect from the imperial fleet, who was advancing blind as a bat.

To expand on what Phanatic said a little bit, early carrier engagements (Coral Sea, Midway, Eastern Solomons, Santa Cruz Islands) involved sending up search planes, gathering VERY incomplete data (if any data at all) from those, and then sending your bombers up in the general direction of the enemy and hoping you found him before he found you, because there was no such thing as SIGINT/ELINT precise enough to allow you to home in on enemy emissions or anything close to reliable and effective surface search radar (obviously that changed a little as the war progressed). Even if your scout planes found the actual enemy fleet (not always a guarantee, as these battles are rife with examples of scout planes located the "main body" which turns out to be a screening force of cruisers and destroyers with the main body of carriers several miles away) but by the time your scouts reported back and your bombers were launched and flew the hundreds of miles to attack the enemy fleet you had to guess based on projections where the enemy fleet was going to be since it's not like the fleet would sit still once you found it. At Midway this haphazard method of combat is revealed in several instances...a simple navigation error of a little over 10 degrees resulted in Hornet's Air Wing completely missing the Japanese fleet during the first U.S. attack (which is why Torpedo 8 attacked alone and unescorted, because its commander broke away from the formation); the only reason the Enterprise's dive bomber formation detected the Japanese carrier fleet and struck their decisive blow is that a) its commander, Wade McClusky, pushed his search beyond his bingo fuel limits and b) during that additional push he spotted the wake of a Japanese destroyer that was lingering behind the formation after depth charging an American submarine; and the initial U.S. attack only targeted 3 of the 4 Japanese carriers, leaving the 4th, Hiryu, untouched...this left the Japanese capable of launching attacks that resulted in the eventual sinking of the Yorktown.

While there is definitely a case to be made that Midway wasn't the popular myth of this literal David vs Goliath story of the heroic plucky underdog Americans taking on the invincible Japanese armada, at the tactical level the battle was a very very close run thing.

large hands
Jan 24, 2006

Phanatic posted:

Crypto's nice, but take a look at the Battle of Crete. The German invasion plans were an open book. The British knew exactly when and where they'd be attacking with what forces, and still managed to gently caress up enough to lose.

Hell, they knew about pearl harbor beforehand and that didn't do anyone any good :twisted:

zoux
Apr 28, 2006

wdarkk posted:

This at least is probably not true. The authors of Shattered Sword did an analysis, and basically it comes down to the fact that Japanese naval landing doctrine was atrocious when it came to landing on a beach occupied by the enemy. They had no radios to coordinate support, and never trained in doing it.

Additionally the troops on midway would likely have enjoyed a very high margin of superiority in terms of firepower, due to the Japanese having to wade several hundred feet through the surf from their disembarkation point to get to the island.

Also the IJA commander for the invasion was ill-starred.

Is Shattered Sword the best book on the Battle of Midway? I know almost nothing about the battle so is there a better "beginner-tier" book, for lack of a better term?

MagnumHB
Jan 19, 2003

zoux posted:

Is Shattered Sword the best book on the Battle of Midway? I know almost nothing about the battle so is there a better "beginner-tier" book, for lack of a better term?
Sure is. Shattered Sword dispels many of the myths perpetuated in pretty much any of the older books such as Prange's Miracle at Midway to the point where they are no longer worth reading.

Zorak of Michigan
Jun 10, 2006


I agree that Shattered Sword adds a lot, but it also under-emphasizes some crucial points about how poor American doctrine was in favor of a focus on sheer weight of war machinery and Japanese mistakes. In that way it reminds me of another book I like, Mosier's The Myth of the Great War. Both were written to challenge prevailing wisdom, and so both assume that the reader knows the prevailing wisdom. Reading either one in isolation will give you a limited perspective on the subject. Edit: And the Prange Midway book is still a good read.

fuf
Sep 12, 2004

haha

Phanatic posted:

Crypto's nice, but take a look at the Battle of Crete. The German invasion plans were an open book. The British knew exactly when and where they'd be attacking with what forces, and still managed to gently caress up enough to lose.

Keegan's got a good treatment of this: http://www.amazon.com/Intelligence-War-value-limitations-military/dp/0375700463/ref=pd_sim_b_1

The story I've heard about Crete is that the British intentionally didn't act on the intelligence they had because they didn't want the Germans to suspect they could crack Enigma codes. Is that true?

MagnumHB
Jan 19, 2003
Fair point. I'll also add that Lundstrom's The First Team goes very in-depth on American air operations specifically.

tangy yet delightful
Sep 13, 2005



Snowdens Secret posted:

I understand it was the first battle fought beyond line of sight, and this question is obvious nonsense along the lines of "who would win a fistfight between Napoleon and Hitler", but why would you say Midway was more significant than Salamis, Lepanto or Trafalgar?
:911:


This is somethingawful.us son!

Zorak of Michigan
Jun 10, 2006


MagnumHB posted:

Fair point. I'll also add that Lundstrom's The First Team goes very in-depth on American air operations specifically.

I loved The First Team so much that I felt really disappointed when I realized his books on carrier aviation didn't cover the entirety of the war. The two First Team books show a lot of technical and human detail. Any Midway book will tell you that the Wildcat couldn't dogfight a Zero and a Buffalo couldn't even stay in the sky with one, but Lundstrom gets into the nitty gritty of why the pilots preferred the F4F-3 to the F4F-4 and how Jimmy Thach deserves to be a household name. If you love this stuff, you must buy those books.

wdarkk
Oct 26, 2007

Friends: Protected
World: Saved
Crablettes: Eaten

Zorak of Michigan posted:

I agree that Shattered Sword adds a lot, but it also under-emphasizes some crucial points about how poor American doctrine was in favor of a focus on sheer weight of war machinery and Japanese mistakes.

Well, it's supposed to mostly cover the Japanese side.

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Alaan
May 24, 2005



Kind of a crappy picture from the local newspaper's site, but a neat car. Guy designed it off the P-40 Warhawk schematics.

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