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Check for smooth sliding, indeed.
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Jan 22, 2018 02:07
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Pilot complained about rough running. Ran a compression check. One cylinder showed 0psi. Pulled the cylinder off and found the problem. I don't think a lot of people understand how large aircraft engines are. This is one of six pistons (and the dead valve) that gives the engine a 550 cubic inch displacement (at 4.25" stroke). Sorry I only had a dime for scale.
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Jan 22, 2018 03:06
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babyeatingpsychopath posted:Pilot complained about rough running. Ran a compression check. One cylinder showed 0psi. Pulled the cylinder off and found the problem. Yeah, you have to make X amount of horsepower, RPM cap of something ridiculous like 2600 usually. The solution: gently caress-off huge piston engines.
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Jan 22, 2018 03:14
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EightBit posted:Yeah, you have to make X amount of horsepower, RPM cap of something ridiculous like 2600 usually. The solution: gently caress-off huge piston engines. Yeah, 300hp, 3k redline. Note that 550cid is 1.5l per cylinder. Also, magnetos and constant-pressure fuel injection. If it worked in 1924, it's still in new-production engines.
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Jan 22, 2018 03:22
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Well, gear reduction is expensive compared to direct drive, and it's not like improving the performance of general aviation piston engines is a priority for anyone when gas turbines exist.
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Jan 22, 2018 03:27
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EightBit posted:Yeah, you have to make X amount of horsepower, RPM cap of something ridiculous like 2600 usually. The solution: gently caress-off huge piston engines. before anyone else posts it  https://en.wikipedia.org/wiki/Pratt_%26_Whitney_R-4360_Wasp_Major 28 cylinders, 71.5 litres, 4300 horsepower @ 2550 RPM on 115/145 avgas with 30psi boost. Each cylinder displaces 2.5 litres and it's air-cooled. quote:Although mechanically reliable in flight, it developed an unenviable reputation for in-flight fires, particularly in its Boeing Stratocruiser application, and in addition the Wasp Major was maintenance-intensive. Improper starting technique could foul all 56 spark plugs, requiring hours to clean or replace. Sagebrush fucked around with this message at 03:33 on Jan 22, 2018 |
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Jan 22, 2018 03:30
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Sagebrush posted:before anyone else posts it These are extremely cool to check out in person. Absolutely massive and chock full of complex looking poo poo everywhere. There's one in the Boeing Museum of Flight in Seattle and another in a private museum near Newberg in Oregon.
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Jan 22, 2018 03:44
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InitialDave posted:Japanese anthropomorphic advice booklets are always the best thing.  Eye contact and a firm handshake are key to earning the trust of your engine  STOP! Don't hellaflush your Miata!
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Jan 22, 2018 03:57
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InitialDave posted:Japanese anthropomorphic advice booklets are always the best thing. As cheesy as it sounds, encountering one almost always make me smile regardless of how my day has been going.
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Jan 22, 2018 04:02
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Y'all should pick up a copy of John Muir's VW book then. Though I guess it doesn't have much in the way of anthromorphic beetles, but it's sort of in the ballpark.
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Jan 22, 2018 04:04
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Sagebrush posted:before anyone else posts it Note the H4 used 8 of these. 224 pistons with a displacement of 572 liters.
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Jan 22, 2018 04:35
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um excuse me posted:Note the H4 used 8 of these. 224 pistons with a displacement of 572 liters. What's the gas mileage on that?
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Jan 22, 2018 04:52
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um excuse me posted:Note the H4 used 8 of these. 224 pistons with a displacement of 572 liters. The B-36 used "only" six of them...but it flipped them around into a pusher configuration, which made them catch on fire all the time due to lack of airflow, and then added another four turbojets to make up the extra thrust the plane still needed. https://en.wikipedia.org/wiki/Convair_B-36_Peacemaker The engineer's call when the plane was ready for takeoff was "six turning, four burning" and here is the engineer's station 
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Jan 22, 2018 04:59
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BitBasher posted:What's the gas mileage on that? If you can find the fuel capacity divide it by like 3,000 to get gallons per mile.
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Jan 22, 2018 04:59
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Plinkey posted:If you can find the fuel capacity divide it by like 3,000 to get gallons per mile. 12, 600 gallons apparently! 4.2 gallons per mile seems really, really good. Too good. Unbelievable really.
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Jan 22, 2018 05:18
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Bulk Vanderhuge posted:
My car didn't come with that handbook so now my engine is sulking on the floor, next steps?  
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Jan 22, 2018 09:37
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Midjack posted:As cheesy as it sounds, encountering one almost always make me smile regardless of how my day has been going.  thing to remind me of putting kits together.
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Jan 22, 2018 09:43
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track day bro! posted:My car didn't come with that handbook so now my engine is sulking on the floor, next steps? Set out a saucer of oil.
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Jan 22, 2018 09:56
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Sagebrush posted:The B-36 used "only" six of them...but it flipped them around into a pusher configuration, which made them catch on fire all the time due to lack of airflow, and then added another four turbojets to make up the extra thrust the plane still needed.
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Jan 22, 2018 11:49
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Doesn't disrupt the airflow over the wings. (another) downside: it makes a really weird distinctive sound so you could hear a B-36 coming a dozen miles off.
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Jan 22, 2018 11:55
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Data Graham posted:Doesn't disrupt the airflow over the wings. This. The B-36 has an extremely efficient (and gently caress-off-huge) airfoil, which was necessary to get the required un-refueled range. It also helped lightly-loaded reconnaissance versions achieve a 58,000 foot service ceiling. (That’s pretty high, even for modern aircraft.) The sound that is mentioned above is noticeable in all aircraft with a prop behind the wing; Listen to a Piaggio 180 some time as it departs. Hearing and seeing a B-36 fly again is a recurring fever-dream of mine, though.
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Jan 22, 2018 12:56
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Sagebrush posted:before anyone else posts it I think it's interesting that every cylinder of that engine displaces the same as my Subaru, and make's about the same amount of power (~155hp).
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Jan 22, 2018 13:05
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Sagebrush posted:before anyone else posts it Yeah sure this thing was cool in the peacemaker, but check out the stratocruiser and it's Hawaiian lounge! 
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Jan 22, 2018 13:18
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Sagebrush posted:
I thought it was "Two turning, two burning, two smoking, two choking and two unaccounted for"
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Jan 22, 2018 13:42
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Sagebrush posted:before anyone else posts it um excuse me posted:Note the H4 used 8 of these. 224 pistons with a displacement of 572 liters. quote:The Wasp Major engines had a prodigious appetite for lubricating oil: each engine required a dedicated 100 gal (380 l) tank.[citation needed] Normal maintenance consisted of tedious measures, like changing the 56 spark plugs on each of the six engines; the plugs were often fouled by the lead in the 145 octane anti-knock fuel required by the R-4360 engines. Thus, each service required changing 336 spark plugs. Another frequent maintenance job was replacing the dozens of bomb bay light bulbs, which routinely shattered during test firing of the turret guns.[citation needed] 336 spark plugs per service. I won't whine about my 50,000mile car service any more.
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Jan 22, 2018 14:03
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Midjack posted:As cheesy as it sounds, encountering one almost always make me smile regardless of how my day has been going. During a political discussion yesterday I noticed yesterday that I can't hear "Ann Coulter" anymore without thinking of this description of her, and it makes me laugh every time.
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Jan 22, 2018 14:24
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What the gently caress are you and that tweet on about?
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Jan 22, 2018 14:34
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Metal Geir Skogul posted:What the gently caress are you and that tweet on about? it looks like the usual perma-mad libs trying to be edgy and funny but what it has to do with this thread is anyone's guess
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Jan 22, 2018 14:50
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Shai-Hulud posted:I thought it was "Two turning, two burning, two smoking, two choking and two unaccounted for" No that's the landing checklist.
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Jan 22, 2018 16:31
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"One missing. Check that — found on wing after brief search"
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Jan 22, 2018 16:36
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Been awhile since I've seen "Strategic Air Command" with Jimmy Stewart but even in the movie it crashes because it catches fire.
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Jan 22, 2018 16:46
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C-Bangin' it 
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Its lunch break, sitting in my office. I wasn't going to log in to facebook but did, now I have something to contribute!!   
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Jan 22, 2018 18:36
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C-clips, always there to brighten someone's day.
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Jan 22, 2018 18:39
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tetrapyloctomy posted:During a political discussion yesterday I noticed yesterday that I can't hear "Ann Coulter" anymore without thinking of this description of her, and it makes me laugh every time. 
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Jan 22, 2018 19:19
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MrYenko posted:It also helped lightly-loaded reconnaissance versions achieve a 58,000 foot service ceiling. In the early-mid 50s the RB-36D was able to fly above Soviet air defense range - neither their fighters or ground-based AA guns could touch it. In addition their only air-search radars at the time were leftover WWII vintage units from lend-lease and reverse-engineered copies that had a 40,000 foot maximum range, so in addition to being able to outfly their defenses they were effectively outside of radar range as well. As a result there were a lot of flyovers of Soviet and Chinese airspace until their defenses caught up.
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Jan 22, 2018 19:46
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InitialDave posted:C-clips, always there to brighten someone's day. Well, at least he doesn't have to worry about the pain of removing a drum for a brake job. I remember (hell this was probably was 30+ years ago) where one of the news channels talked about axles flying out due to the C-clip. Akin to the Samurai rollover type stuff in its presentation.
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Jan 22, 2018 20:37
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spog posted:336 spark plugs per service. And the plugs cost $50/each! gently caress you, Champion. The plugs for my plane are literally Volkswagen plugs - 14mm thread, 3/8” reach, single electrode jobs - but because they’re ~special~ they’re $50 each. And my plane has 12 of them. $600 for new plugs. Makes me sick.
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Jan 22, 2018 21:42
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charliemonster42 posted:And the plugs cost $50/each! gently caress you, Champion. The plugs for my plane are literally Volkswagen plugs - 14mm thread, 3/8” reach, single electrode jobs - but because they’re ~special~ they’re $50 each. And my plane has 12 of them. $600 for new plugs. Makes me sick. Do they have to come with a certificate saying they are for airplanes?
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Jan 22, 2018 22:27
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Breakfast Feud posted:Yeah sure this thing was cool in the peacemaker, but check out the stratocruiser and it's Hawaiian lounge! The Stratocruiser was also prone to horrible mechanical failures. Of the 55 Stratocruisers built, 13 were lost in accidents for various reasons, including several cases where a propeller blade would become unbalanced, which often resulted in the blade (and occasionally the entire propeller and engine) being torn from the aircraft.
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Jan 22, 2018 23:03
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charliemonster42 posted:And the plugs cost $50/each! gently caress you, Champion. The plugs for my plane are literally Volkswagen plugs - 14mm thread, 3/8” reach, single electrode jobs - but because they’re ~special~ they’re $50 each. And my plane has 12 of them. $600 for new plugs. Makes me sick. How much would a spark plug change for a W12 Phaeton cost at dealer prices?
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Jan 22, 2018 23:32
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