Spitfire Mk.21's redesinged wing

Discussion in 'Technical' started by gomwolf, Oct 18, 2014.

  1. gomwolf

    gomwolf Member

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    Hello~.

    There is a problem about Spitfire Mk.21's redesigned wing. I try to find information about this wing and found some articles confront each other. It make me confuse, please help me guys!

    Some articles told this redesign wing have laminar flow airfoil. But there is no information about this wing's airfoil, even name of airfoil's form.
    others told redesign wing have same airfoil with before spitfire(NACA 2213(root), NACA 2209.4(tip). Changed thing is aileron for high speed.

    In the book 'Spitfire's forgotten designer' written by Mike Roussel, Spitfire Mk.21's wing have laminar flow airfoil.
    I think, if Spitfire Mk.21 have laminar flow airfoil, it have to big change in performance, especially in top speed. but Spitfire Mk.21's top speed(around 446mph at +18lb) is not big different with Spitfire Mk.XIV(around 447mph at +18lb). It is weird
    In UIUC Applied Aerodynamics Group's airfoil data(The Incomplete Guide to Airfoil Usage), Spitfire Mk.21's airfoil is NACA2213(root), NACA2209.4(tip)


    Which one is right? There is no certain evidence, which give me answer?(Blue prints or documents?) Please guys, help me!
     
  2. tomo pauk

    tomo pauk Creator of Interesting Threads

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    The Mk.21 retained the NACA 2200 series profile, but the wing was redesigned and improved vs.older Spitfire wings. The laminar flow wing was introduced with Spiteful.
     
  3. gomwolf

    gomwolf Member

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    Could you give me some documents that can prove your word? Like blueprint or documents? If you have, please open it to me.

    I saw lots of insist about that each side, but there is no evidences can prove there insist...
     
  4. gomwolf

    gomwolf Member

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    Could you give me some documents that can prove your word? Like blueprint or documents? If you have, please open it to me.

    I saw lots of insist about that each side, but there is no evidences can prove there insist...
     
  5. stona

    stona Well-Known Member

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    The Type Record for the prototype 356/1 Spitfire F Mk 21, of 1st May 1943, states 'wing aerofoil section NACA 22 series of elliptical planform of Spitfire Mk I extended 1.67 ft on each side'

    No laminar flow wing but it was extensively modified. The confusion probably arises from the MAP. The Mk 21 was provisionally referred to as 'Victor' and a letter from the MAP to Supermarine quoted in Spitfire the History (StH) says that "The F 21 Victor aircraft on order are to redesignated F21 Laminar flow wing."

    There are nice drawings on page 468 of my version of StH.

    Cheers

    Steve
     
  6. gomwolf

    gomwolf Member

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    thank you stona! I will find that book!
     
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