Author Topic: Running Radials At Full Power? (Read 335 times)

Toad · « **on:** June 24, 2001, 10:55:00 PM »

Was perusing this page (Widewing's I think?) http://www.geocities.com/pentagon/quarters/9485/P-47M.html and had a chuckle remembering the threads we've all read about how there should be some penalty for running your P&W R2800 flat out for long periods. Overheating, loss of power, whatever.

Anyway.....enjoy.

"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.....

During durability testing of the C series R-2800 by Republic, it was decided to find out at what manifold pressure and carburetor temperature detonation could be induced. They ran the engine at extreme boost pressures that produced 3,600 hp! But wait, it gets even more amazing. They ran it at 3,600 hp for 250 hours, without any failure! This, with common 100/130 avgas. No special fuels were used. Granted, the engines were completely worn out, but survived without a single component failure. Try that with Rolls Royce Merlin or Allison V-1710."

Um... hey Pyro, can I have a 2800C in a Jug with a special "crewchief tuning" option in the keymapper?

What an engine!

<EDIT>Naudet, did u see this? </EDIT>Easy now...just kidding!

[ 06-25-2001: Message edited by: Toad ]

juzz · « **Reply #1 on:** June 25, 2001, 03:17:00 AM »

As long as there is also a 4000HP Tempest, P-38 gets ~3000HP powerboat engines, etc...

Sorrow[S=A] · « **Reply #2 on:** June 26, 2001, 02:22:00 AM »

Ironically Toad the Engine Pyro picked to illustrate how these planes could run at full throttle was the PW-2800. Not so Ironically he picked one of the two or three engines in all of WWII that had anywhere near this capacity for abuse.

The PW-2800, the Ash-82 and the VK-105&107 series motors were almost the only ones in all of WWII that had service records indicating an ability to run all out for long periods of time with no problems. The issue I believe was people wanted the Allison, Merlin, Daimler-Benz and BMW motors to reflect a little more of how they reacted on full throttle if left there for extended periods of time.

Toad · « **Reply #3 on:** June 26, 2001, 08:45:00 AM »

Seeker,

Check the "tweaked engine request" thread.

Oh, Yah... once again, Naudet, I did not request a "tweaked engine".

See the "just kidding" part?

Naudet · « **Reply #4 on:** June 26, 2001, 05:27:00 PM »

My thread was actually a reponse on someone mentioning engine tweaking on the P38 in the P38J thread of batdog.
And someone else (not u) asking for the P47 running at the same manifold pressure as that of Jonny Johnson (i think 72 lbs.)

I got the

and

part of ur post. But i know the P47J a plane that was able to fly 504mph, would have nothing against it as a special JET hunter perk plane in here.

Robert · « **Reply #5 on:** June 26, 2001, 08:07:00 PM »

I was told or read some where about a P-51 pilot that ran his 51 at full power with wep on for over 25 minutes. He was trying to escape a FW190. Needless to say he made the escape but after returning back to base his crew chief told him the exhaust manifold had been completely burnt off and the engine had to be completely reworked. The stories you hear sometime can or can't be believed. One way or the other I’m satisfied but would like the have the engine damage if you over heat or run at to hi of a rpm.

RWY