Evaluation on P-39 maximun speeds!

Discussion in 'Technical Requests' started by Tales Carneiro, Nov 18, 2008.

  1. Tales Carneiro

    Tales Carneiro New Member

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    I would like some evaluation about P-39 maximun speeds at diferent altitude!

    I found in the fórum a flight test on the aircraft but no references about maximum speeds.
     
  2. Juha

    Juha Well-Known Member

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  3. Micdrow

    Micdrow “Archive”
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  4. Tales Carneiro

    Tales Carneiro New Member

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    Sounds interesting how the two source disagree a lot with respect to maximum airspeeds.

    What is the source of the first? And the second?

    How about evaluations of the manufacturer itself, Bell aircrafts?
     
  5. comiso90

    comiso90 Active Member

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    Were the Russians able to perform any modifications that enhanced performance? Certainly they adopted tactics to exploit the strengths but did they do any airframe or mechanical tweaking to wrench performance from the P-39?
     
  6. Juha

    Juha Well-Known Member

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    Tales
    those in Mike William's site are are based on tests flights. Anyway N should be faster than early Qs or any Q with underwing mg gondolas

    Comiso
    usually Russians removed the wing armament

    Juha
     
  7. comiso90

    comiso90 Active Member

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    to what effect? better low altitude handling? increased load?

    .
     
  8. kool kitty89

    kool kitty89 Well-Known Member

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    Reduced drag on the P-39Q which had a pod/gondola mounted .50 under each wing. In this configuration (and possibly with a 4-blade prop of later Q models) I belive this was the fastest production Airacobra approaching 400 mph at ~10-11,000 ft.

    I'm not sure about removing the 4x .30's internal mounted in the wings on earlier models.

    Those speed figures may be exaggerated though as the P-40F seems much too fast compared to other figures I've seen (though Curtiss testing figures are reputed to be exaggerated). The first listed P-40F figure seems realistic, but second one with the short dashed line at 8,500 lbs seems a bit fast with an unusually high critical altitude. (with 380 mph at 22,500 ft)

    That also seems high for the P-39D, for the N/Q (and some M's) this seems realistic, but not for the P-39D.
     
  9. Juha

    Juha Well-Known Member

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    Comiso
    Russians wanted lighten the plane.

    Tales
    one explanation is that the lower figures are flown with military power (1200hp for N and Q) and the higher with WEP (1420 hp for N and Q) permitted max 5 min in time.

    KK
    many Soviet pilots removed wing guns also from earlier models, idea was to make a/c lighter. And they didn't think highly on .300 mgs thought them rather useless, especially those in wings. Germans. Soviets and Finns wanted closely grouped armament.

    Juha
     
  10. Tales Carneiro

    Tales Carneiro New Member

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    Thanks for explanation. What is the armament of this russian modified a/c?

    30mm (37mm?) cannon and two mg's?

    However M Willians do not present FW 190 and Zero versions. Zero didnt have much speed, but FW! What is the FW in this comparison?
     
  11. Juha

    Juha Well-Known Member

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    Hello Tales
    Russian P-39s, when wing armament was removed they had 1*37mm + 2*12,7mm.

    On performance of Zero and 190
    Now it is always better to look info from user country for a/c performance, many times the info based on captured a/c was a bit unreliable.

    Juha
     
  12. Rapecq

    Rapecq New Member

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