[NSRCA-discussion] Aero design question

[Nat Penton]

Bob
If you design for the static condition, then ,as the roll rate increases the AOA progressively decreases at the wing tip. ( Simply add, vectorily, the rotational velocity to the airspeed )                             Nat
  ----- Original Message ----- 
  From: Bob Richards 
  To: NSRCA Mailing List 
  Sent: Monday, September 11, 2006 8:30 AM
  Subject: Re: [NSRCA-discussion] Aero design question



  Nat Penton <natpenton at centurytel.net> wrote: 

    For ailerons, IMO, the Cl along the span should be about constant to lower the probability of tip stall This would be  constant % chord ( Bob Richards ?).

                                             Nat


  Nat, I think I understand your point. In a static situation (ailerons deflected, but not rolling) I would agree with you. However, in a dynamic situation where the airplane IS rolling, then the angle-of-attack at each point along the span is different (due to the rolling action) and everything changes (back to the helical pitch analogy).

  It would be interesting to have someone try this in a wind tunnel, but I'm not sure how you would rig the model in the tunnel. 

  I think back to the Wright Flyer, did that have a tip-stall tendency?? I don't know, I never flew one!  :-)  If aileron deflection would cause a tip stall, that would be the worst case since the highest AOA is at the tip.

  Bob R.



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