war emergency power and performance test

Discussion in 'Aviation' started by thedab, Apr 22, 2013.

  1. thedab

    thedab Member

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    Hi i'm Ian this is my first post,what I like to know is, the boscombe down performance tests for mk9 spitfire. i.e max speed and stuff.

    was it done with W.E.P. (war emergency power ) or done without W.E.P.
     
  2. Greyman

    Greyman Active Member

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    They were based on 'Combat' limitations for the engine. ie: five minute limit (as per the Pilot's Notes handbooks).

    3000 rpm, +15 boost (Merlin 61) and +18 boost (Merlin 66).
     
  3. Jabberwocky

    Jabberwocky Active Member

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    Which particular tests are you interested in?

    WWII Aircraft Performance is where you should go if you want to look up the original tests.

    The RAF didn't really have a 'war emergency power' setting.

    As Greyman posted, they had a 'combat rating' with a five minute limit.

    For the Merlin 61 (fitted to the F Mk IX), this was +15 lbs of boost, giving approximately 1,565 hp.
    For the Merlin 63A and 66 (fitted to LF MK IX) this was +18 lbs of boost, giving approximately 1,720 hp.
    For the Merlin 63 and 70 (fitted to the F Mk IX and HF Mk IX) this was +18 lbs of boost, giving approximately 1,710 hp.
    Later in the war, the Merlin 66 was cleared for +25 lbs of boost when using 150 octane fuel. This gave the engine approximately 2,020 hp.
     
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