text: factor requiring consider- 
  ation in a comparison of flap types is the aero- 
  dynamic 
  the 
  flap. Positive camber produces a nose down 
  twisting moment-especially great when large 
  camber is used well aft on the chord (an 
  obvious implication 
  is that flaps are not prac- 
  tical on a flying wing or tailless airplane). 
  The deflection of a flap causes large nose down 
  twisting 
  moments which create important 
  
  One additional 
  
  twisting moments caused by 