Allison V-1710 for P40 B/C propeller/engine gear ratio question

Discussion in 'Engines' started by bruno_, Feb 3, 2013.

  1. bruno_

    bruno_ Member

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    Dear all,
    I'm looking for the propeller/engine speed ratio of engines that powered the P40 B and C versions.
    If I'm not wrong the engine should be the Allison V-1710-33. More specifically I'm looking for such number(s?), since I'm interested in specifications of P40 that served in RAF/SAAF in the North African theatre.
    Can you kindly help me?
    Thanks in advance!
     
  2. tomo pauk

    tomo pauk Creator of Interesting Threads

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    According to the table about the V-1710-33, found at the book 'Vee's for victory', pg. 124, the propeller gear ratio was 2.0:1.
     
  3. bruno_

    bruno_ Member

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    #3 bruno_, Feb 3, 2013
    Last edited: Feb 3, 2013
    Thank you very much tomo paulk! It looks like one of the highest engine to prop ratios for wwii engines.
     
  4. kmccutcheon

    kmccutcheon New Member

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    #4 kmccutcheon, Feb 3, 2013
    Last edited: Feb 3, 2013
    Here is a good general reference for many of these kinds of questions:
    (http://www.enginehistory.org/moddesig.shtml)
     
  5. wuzak

    wuzak Well-Known Member

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    Bruno, if I understand what you mean about the engine to prop ratio I would say you are incorrect.

    The British used a different system - prop rpm:engine rpm, which is the inverse of the American system.

    Now 2:1 was a common ratio on P&W R-2800s. Others had 16:9 and still others had 2.5:1
    http://www.enginehistory.org/ModDesig/I4 9.tif

    The Merlin XX had a reduction ratio of 0.42:1 (2.38:1). The 45 had 0.477:1 (2.096:1).

    The Vulture had a reduction ratio of 0.35:1 (2.86:1), the Sabre 0.274:1 (3.65:1).

    Engines that had higher rpm capability generally had the larger reduction ratios.
     
  6. bruno_

    bruno_ Member

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    Absolutely right, wuzak. My fault.
    @kmccutcheon: thank you for the interesting link!
     
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