P40 performance advice needed

[adler_1]

hello

I am getting a max of 300 miles/hr speed  at 3500 RPM which is the limit or 40 of mercury or else booom goes the engine  !! The air intake at 5% and engine stays very cool , rpm at 100% , no problem there . My question is how do i improve my straight line speed and what should i reach ? do i stick to the rpm limit during combat as well ? i ask because  i tried going over 40 of mercury and the engine seized immediately .  In the Far East pilots were told to stay always high  and avoid the zero due to its slow performance and heavy weight , yet in Africa  it did stand up to the BF109 F4 . Any advice would be appreciated 

[ACG_Suardi]

On 9/13/2020 at 11:12 AM, adler_1 said:

hello

I am getting a max of 300 miles/hr speed  at 3500 RPM which is the limit or 40 of mercury or else booom goes the engine  !! The air intake at 5% and engine stays very cool , rpm at 100% , no problem there . My question is how do i improve my straight line speed and what should i reach ? do i stick to the rpm limit during combat as well ? i ask because  i tried going over 40 of mercury and the engine seized immediately .  In the Far East pilots were told to stay always high  and avoid the zero due to its slow performance and heavy weight , yet in Africa  it did stand up to the BF109 F4 . Any advice would be appreciated 

 

Well, I think you are talkink about you IAS (Indicater airspeed), that one you read in you speed indicator... If that's the case, you are probably doing nothing wrong because that is the performance expected of a P-40.

Again, if you're talking about IAS, it will depend to your altitude to know what is your TAS (True airspeed). An easy way to know your TAS is adding 2% of your IAS at each 1.000ft of altitude.

I made a flight test here, and I was at 3.000ft with 42 MAP and 3.000 RPM (wich is the maximum, not 3.500), and was able to reach 300 mph (IAS) at this configuration / altitude. This mean that I was about 318mph (TAS), or 508km/h... and this is good for a P-40 in level flight.

 

After this I climb.... Keeping the same MAP/RPM configuration but at 11.000ft, I was able to reach 280 mph (IAS), wich is 346 mph (TAS) and this is very close this real flight test data 

 

So, that's the airplane performance... there is no more to do.

Edited September 24, 2020 by rcsuardi