Demosthenes -> RE: How would German WWII Ac rate to WITP Ac ? (2/24/2006 6:26:08 PM)
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ORIGINAL: el cid again quote:
I'm sure there was a rationale to radials, or the Japanese probably wouldn't have used them. If memory serves though (and it frequently doesn't) radials are harder to maintain. A radial engine can continue to work EVEN if it is hit by enemy fire! We had planes with ONE engine return to base/ship after MORE THAN ONE of the piston heads had been shot off! The documented stories of shot up P-47s - with cylinders shot away - but still flying (usually over Europe) are many...that's durability and reliability. The P-47 also proved if you stiff enough HP in the engine you can make up for higher drag frontal area. quote:
The Republic P-47M The Fastest Piston Engine Fighter Of The War P-47M of the 56th Fighter Group [image]local://upfiles/19015/AE4E0B999E3D474CBC57E07C3B7A274C.jpg[/image] The P-47M was, essentially, developed collaterally with the XP-47J. The "J" was fitted with a high output version of the P&W R-2800. Specifically, the R-2800-57. This engine made 2,800 hp @ 2,800 rpm at 35,000 feet. This is in War Emergency Power. The aircraft actually attained 507 mph at an altitude of 34,300 feet. 2,800 hp is 133% of rated power. At military power (100%), the XP-47J could sustain 470 mph. 435 mph was attained at 81% of its rated power (1,700 hp). All performance figures were obtained at 34,300 feet. The "J" model was an especially good climbing fighter too. It had a climb rate at sea level of 4,900 fpm. At 20,000 feet, it was still rocketing up at 4,400 fpm, and got there in 4 minutes, 15 seconds. Time to 30,000 feet was only 6 minutes, 45 seconds. Now that's an interceptor! Yet it had a usable range of 1,075 miles. Rather impressive, don't you think? No, this was not a stripped down hotrod. It was fully armed and carried ballast in the wings equal to 267 rds per gun. The aircraft was flown to a height of 46,500 feet and was capable of a bit more.
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