Aerocobra!

[Krusty]

I'm afraid you'd have to find that number and post it before I believe it. A 1200hp engine being run at 1400+ hp? Hell even the latest-model P63s (that didn't see combat) barely had a 1400hp engine.

It's like a CPU chip. You can put it in, and run it at standard specs, or you can overclock it. Overclock it too much and it blows. Same for engines. They have to be designed to run at certain speeds, otherwise they blow up somewhere, and stop turning.

[humble]

Originally posted by Krusty
I'm afraid you'd have to find that number and post it before I believe it. A 1200hp engine being run at 1400+ hp? Hell even the latest-model P63s (that didn't see combat) barely had a 1400hp engine.

It's like a CPU chip. You can put it in, and run it at standard specs, or you can overclock it. Overclock it too much and it blows. Same for engines. They have to be designed to run at certain speeds, otherwise they blow up somewhere, and stop turning.

I'm simply looking at the material I find...nothing more, nothing less. If you look at the russian history it clearly states that they maxed out the engine performance in exchange for shorter engine life. From what I read averge combat life for the engine was roughly 50 flight hours. So obviously they were pushing them very hard. Here is another site with some russian input...it has top speed for the P39-Q at 399???

P-39??

I've got no special fixation with the p-39. I'm simply curious.....half of the top 10 russian aces flew 39's for all or a majority of there kills. Seeing just how capable the ki-61 and C205 are in AH I simply believe the P-39 is much better then suggested. By and large all comments from guys who flew it (with walsh as notable exception) are positive.

[Widewing]

Originally posted by Krusty
I'm afraid you'd have to find that number and post it before I believe it. A 1200hp engine being run at 1400+ hp? Hell even the latest-model P63s (that didn't see combat) barely had a 1400hp engine.

Installed in the P-39M, P-39N and P-39Q, both the V1710-83 and V1710-85 were rated at 1,420 hp at 3,000 rpm @ 57" MAP.

It gets better... The V1710-63 installed in the P-39K and P-39L was rated at 1,590 hp at 3,000 rpm @ 61" MAP.

Now, the V1710-93 installed in the P-63A was rated at 1,820 hp at 3,000 rpm @ 75" MAP with water injection.

See Dean's, America's Hundred Thousand.

Oh, and some P-63s saw limited combat against the Luftwaffe as part of a combat evaluation. Later, some Soviet P-63s saw combat briefly against the Japanese in the last week of the war.

My regards,

Widewing

[Widewing]

Originally posted by humble
I'm simply looking at the material I find...nothing more, nothing less. If you look at the russian history it clearly states that they maxed out the engine performance in exchange for shorter engine life. From what I read averge combat life for the engine was roughly 50 flight hours. So obviously they were pushing them very hard. Here is another site with some russian input...it has top speed for the P39-Q at 399???

I've seen data that shows the P-39Q-1 was capable of 399 mph at 9,700 feet. However, I've never seen any corroborating data from another source.

My regards,

Widewing

[humble]

Originally posted by Widewing
Installed in the P-39M, P-39N and P-39Q, both the V1710-83 and V1710-85 were rated at 1,420 hp at 3,000 rpm @ 57" MAP.

It gets better... The V1710-63 installed in the P-39K and P-39L was rated at 1,590 hp at 3,000 rpm @ 61" MAP.

Now, the V1710-93 installed in the P-63A was rated at 1,820 hp at 3,000 rpm @ 75" MAP with water injection.

See Dean's, America's Hundred Thousand.

Oh, and some P-63s saw limited combat against the Luftwaffe as part of a combat evaluation. Later, some Soviet P-63s saw combat briefly against the Japanese in the last week of the war.

My regards,

Widewing

Your much more seasoned at fact finding. Is there anyway to get the P-39/109E reports or any other hard data on performance. It seems like there was almost zero real "hard numbers" in mainstream sources.

V1710-85 were rated at 1,420 hp at 3,000 rpm @ 57" MAP

This is the engine listed in the russian site linked above. Can you calculate top speed from the #'s?? I'd guess its right in line with the 615 km/h listed...

I've seen the 399 multiple places also but with no supporting documentation. All seem based on russian test data which is not referenced directly.

[Krusty]

Originally posted by humble
This is the engine listed in the russian site linked above. Can you calculate top speed from the #'s??

I don't think you can. I think there's too many variables, including altitude, drag, and the engine power. (*not sure*)