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Cyrano4747 posted:Here's my question: What is it that allows steam pipes to develop (apparently) pin hole leaks that will create an invisible pressure cutting blade? I've heard this before about how hosed up those can be. How do you end up with high pressure gas blasting through a small gap like that without the whole thing just grenading? To my uneducated mind that's the sort of situation that should probably be a very small, very violent leak for about a millisecond after which it erodes the break, things start fracturing quickly, until it becomes two very large pipe-shaped leaks on either end of a rapidly expanding cloud of used-to-be-pipe shrapnel. Steam + C02 = Carbonic Acid, in addition to high temp high pressure water vapor just wrecking poo poo in general. Most steam systems still use standard NPT pipe threads and good 'ol black iron pipe, so you get leaks in the threads. The thickness of the fittings and pipe ensure nothing "grenades", but steam will still work its way down the spiral.
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Jun 1, 2017 00:18
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| # ? May 25, 2024 07:59 |
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The solution to electronic aircraft launching is obvious! Treadmills! 
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Jun 1, 2017 00:20
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brains posted:that's never stopped navy planes from launching gondolas. Not sure whether I'm annoyed that it was a Marine plane or if I appreciate that this is an acknowledgement that "blue money" from the Navy purchases all Marine planes...
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Jun 1, 2017 00:22
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feedmegin posted:Not operations, but the expense of fitting them despite the design in theory allowing for it, but that would have been EMALS sooo. Steam catapults are literally a Royal Navy invention along with angled flight decks. Once you stop doing something operationally, you forget how really, really quickly. The last catapult equipped British carrier was before the Falkland War. Smiling Jack fucked around with this message at 00:26 on Jun 1, 2017 |
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Jun 1, 2017 00:23
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BIG HEADLINE posted:The solution to electronic aircraft launching is obvious! MODS!
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Jun 1, 2017 00:41
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I would like to see a trebuchet aircraft launcher where the fighter is loaded up inverted before launch.
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Jun 1, 2017 00:42
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Smiling Jack posted:Once you stop doing something operationally, you forget how really, really quickly. The last catapult equipped British carrier was before the Falkland War. From what I understand, the Royal Navy has had crewmen aboard American and/or French carriers for a long time to avoid this very problem.
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Jun 1, 2017 01:00
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MrYenko posted:Also, gently caress live steam, and triple-gently caress live steam at sea. That is the stuff of nightmares. I remember reading about a live steam leak in a Canadian warship during the Second World War that took place in harbour. It resulted in a couple of dozen sailors being boiled alive in their hammocks while they slept.
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Jun 1, 2017 01:16
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So do both sides have cockpits? Does the captain sit in the lefthand fuselage and the co-pilot sit in the righthand fuselage? Or is one side just for Paul Allen to sit in and make airplane noises?
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Jun 1, 2017 04:13
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Is the wheelbase narrow enough for a normal runway? Looks like it barely fits on the taxiway....
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Jun 1, 2017 04:25
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Craptacular posted:So do both sides have cockpits? Does the captain sit in the lefthand fuselage and the co-pilot sit in the righthand fuselage? Or is one side just for Paul Allen to sit in and make airplane noises? Dunno on this one, but on the White Knight 2, the right side has controls, and the left side just has painted on windows.
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Jun 1, 2017 04:29
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Hauldren Collider posted:Is the wheelbase narrow enough for a normal runway? Looks like it barely fits on the taxiway.... They pulled it out of the hanger and someone said 'well poo poo, we should have measured twice after all' then contracted the nearest runway paving company.
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Jun 1, 2017 04:31
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Hauldren Collider posted:Is the wheelbase narrow enough for a normal runway? Looks like it barely fits on the taxiway.... I'm pretty sure it's not going to fly anywhere else, just go up, launch a rocket and then come back down to Mojave. But using the Google Maps measuring tool, it looks like that taxiway is about 140 feet wide. I measured a couple runways at different large airports and their runways usually around 190-200 feet wide (edge line to edge line), just like Mojave. So there doesn't seem to be any reason why it couldn't fly somewhere else if they wanted to.
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Jun 1, 2017 04:41
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http://www.defensenews.com/articles/direct-collision-for-us-homeland-missile-defense-interceptor-test-against-icbm-target
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Jun 1, 2017 04:59
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Cyrano4747 posted:Not quite cold war but kinda airpower and gently caress it I run Barter Town: https://www.youtube.com/watch?v=QhGRzKcAu10
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Jun 1, 2017 05:01
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Craptacular posted:I'm pretty sure it's not going to fly anywhere else, just go up, launch a rocket and then come back down to Mojave. But using the Google Maps measuring tool, it looks like that taxiway is about 140 feet wide. I measured a couple runways at different large airports and their runways usually around 190-200 feet wide (edge line to edge line), just like Mojave. So there doesn't seem to be any reason why it couldn't fly somewhere else if they wanted to. MHV's main runway is 12503x200', so if the wheelbase is 140' wide they should have 30' of room on either side of the wheels. Those engines might be over the edges though...
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Jun 1, 2017 05:06
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Gnoman posted:From what I understand, the Royal Navy has had crewmen aboard American and/or French carriers for a long time to avoid this very problem. Also, 'the RN has lost the institutional knowledge to operate catapults', even if it were true, and 'the carriers were built without cats because the RN don't know how to operate them any more' are different statements. They were built without catapults purely for budget reasons. I'm sure the RN would rather have had them fitted even if it took a while to get used to operating them. (and, pedantic I know, but there's more than one Falkland Island. It's the Falklands War)
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Jun 1, 2017 14:24
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Cyrano4747 posted:Not quite cold war but kinda airpower and gently caress it I run Barter Town: Does it bug anyone else that they didn't extend the elevators P-38 style so they were a single unit?
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Jun 1, 2017 14:46
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Blistex posted:Does it bug anyone else that they didn't extend the elevators P-38 style so they were a single unit? YES
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Jun 1, 2017 14:47
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Blistex posted:Does it bug anyone else that they didn't extend the elevators P-38 style so they were a single unit? Jesus Christ yes
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Jun 1, 2017 14:47
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Can you imagine the twisting loads that get transmitted through that center wing box? Holy gently caress.
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Jun 1, 2017 14:59
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MrYenko posted:Can you imagine the twisting loads that get transmitted through that center wing box? Holy gently caress. And they hang a rocket from it!
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Jun 1, 2017 15:01
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Is it just me or does it look like complete poo poo for a public reveal?
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Jun 1, 2017 15:04
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It's probably not a "reveal" in the PR sense, rather, they're probably moving it somewhere else, and there's no way to keep people from taking pictures.
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Jun 1, 2017 15:07
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Fair enough. The wings look like they've been pieced together out of scrap. 
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Jun 1, 2017 15:09
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Blistex posted:Does it bug anyone else that they didn't extend the elevators P-38 style so they were a single unit? Limitations of Kerbal Engine.
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Jun 1, 2017 16:18
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Canada's replacement frigates will cost 2.4 times original estimate according to PBO
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Jun 1, 2017 16:26
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Blistex posted:Does it bug anyone else that they didn't extend the elevators P-38 style so they were a single unit? Yes, hugely. I can imagine those booms flapping about like nobody's business.
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Jun 1, 2017 16:32
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Nebakenezzer posted:Canada's replacement frigates will cost 2.4 times original estimate according to PBO Colour me surprised!! Only 2.4x??? We can get up to 2% GDP spending for NATO in no time with this fuckery. Oh god: quote:The PBO also estimated the cost due to inflation for delaying the awarding of the contract after 2018. “We estimate that for each year of delay, the program would cost about $3 billion more,” Fréchette noted in the study.  we are so hosed
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Jun 1, 2017 16:36
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Blistex posted:Does it bug anyone else that they didn't extend the elevators P-38 style so they were a single unit?
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Jun 1, 2017 16:43
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Re: Invisible Steam leaks rushing out with sufficent pressure to cut stuff in half. Such a leak couldn't possibly be quiet though could It? I mean if the pressure was high enough to potentially start buzzsawing through stuff surely the leak would be noisy as hell.
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Jun 1, 2017 17:21
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Deptfordx posted:Re: Invisible Steam leaks rushing out with sufficent pressure to cut stuff in half. I think concern for leaks like that are usually in loud places or tunnels where you can't easily locate a sound. My familiarity with the threat is from talking to guys in the DC steam tunnels for GSA who told me they wave 2x4s as they walk through.
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Jun 1, 2017 17:23
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Deptfordx posted:Re: Invisible Steam leaks rushing out with sufficent pressure to cut stuff in half. No, but the noise doesn't help you locate it necessarily. quote:It's common belief among utility operators that a good way to check for high-pressure steam leaks is by waving a broomstick in front of you: when the stick suddenly gets chopped in half, you've found your leak. However, Una contacted operations personnel at several power plants across the United States, and while almost all had heard of this alleged practice, most thought it would be an unusual way to find a leak these days. A leak in a steam line with enough pressure to cut a broom in half would likely warrant shutting down the unit. Given the danger of a fatal mistake, it's hard to imagine a plant boss sending workers out on a search mission armed only with a trusty broom. Una further points out that a steam leak, invisible or not, usually isn't tough to locate--imagine a locomotive horn a few inches from your ear. Operators in an enclosed control room can hear steam leaks from several floors away.
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Jun 1, 2017 17:44
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IIRC in one of Michael Collins' books, there's a bit about using brooms to test for hydrogen leaks in rockets. Supposedly the leaks would ignite into a flame that couldn't be seen with the unaided eye, so thermal cameras were installed to catch them. Technicians with brooms were employed to check in the cameras' blind spots.
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Jun 1, 2017 18:24
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ulmont posted:No, but the noise doesn't help you locate it necessarily Yeah, I had to help track down a small packing leak coming off a twelve inch line with some moderately low pressure steam coming through it. You could hear that thing 80+ ft. away over heavy industrial noise and earplugs. Not terribly indistinguishable on its own, but it raised the ambient noise enough you could tell something was wrong. Once you got within 5 ft though that thing was screaming and hot as hell though. Impossible to miss even if you couldn't see it wrapped under all the insulation.
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Jun 1, 2017 18:27
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Mr. Despair posted:has anyone started calling it the carbon condor yet That already exists. (though it "only" has a 200 ft wingspan)
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Jun 1, 2017 20:24
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Sperglord Actual posted:IIRC in one of Michael Collins' books, there's a bit about using brooms to test for hydrogen leaks in rockets. Supposedly the leaks would ignite into a flame that couldn't be seen with the unaided eye, so thermal cameras were installed to catch them. Technicians with brooms were employed to check in the cameras' blind spots. Yeah, they used it for finding hydrogen fires, which will burn without a visible frame. Semi-legit citation: https://spinoff.nasa.gov/spinoff1997/ps1.html quote:The technology was developed by John C. Stennis Space Center to visually assess the presence, location, and extent of hydrogen fires. The need for such equipment was generated by the center's use of more than one million gallons of liquid hydrogen per month in its rocket engine test programs. Indeed, hydrogen fires are a significant risk.
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Jun 1, 2017 21:42
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Yes, it's like a lava lamp.
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In hydrogen airships, the method for hydrogen leak detection was talking or singing constantly, as the hydrogen changes the pitch in your voice they didn't really have to worry about "fires invisible to the naked eye"
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Jun 1, 2017 21:52
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Nebakenezzer posted:In hydrogen airships, the method for hydrogen leak detection was talking or singing constantly, as the hydrogen changes the pitch in your voice Time to repost this. https://www.youtube.com/watch?v=CXpYFtI0nqU&t=1029s
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Jun 2, 2017 02:24
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Platystemon posted:Time to repost this. And that ranks as the second dumbest thing they did!
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Jun 2, 2017 02:28
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