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Discussion in 'Rifles, Bullets, Barrels & Ballistics' started by MAX, May 28, 2003.

  1. MAX

    MAX Well-Known Member

    Messages:
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    Joined:
    Sep 10, 2001
    Where did it go?

    Next question: As much as I've read about ballistics in recent months it requires digesting before things come together for me. Almost through the last 1/3 of R. McCoy's book the 2nd time... so since Whisper brought up the sonic transition question I'll ask my own:

    I've read that wind deflection is influenced by the cross section of the shock wave, and from McCoy's book and drag graphs it is plain that drag is lower for a given form as the mach number increases. The only way I can really get my mind around crosswind effects is by vector analysis and in that context high mach=less drag=less drift etc. At what point(relative to the projectile) is the cross section of a shock wave significant? Okay, 2 questions [​IMG] , can anyone explain in lay terms why drag decreases as mach increases?
     
  2. MAX

    MAX Well-Known Member

    Messages:
    263
    Joined:
    Sep 10, 2001
    Found the JBM ballistics page at www.eskimo.com/~jbm/. Must have moved...

    So, I'm all ears about shock wave cross section theory...... [​IMG] [​IMG]