text: twisting deflections which 
  reduce the effec- 
  tiveness of the aileron, e.g., downward deflec- 
  tion of an aileron creates a nose down twist of 
  the wing which reduces the rolling moment 
  due to aileron deflection. At very high speeds, 
  the torsional deflection of the wing may be 
  so great than a rolling moment is created 
  opposite to the direction controlled and “aile- 
  ron reversal” occurs. Prior to the speed for 
  aileron reversal, a serious loss of roll helix 
  angle may be encountered. The effect of this 
  aeroelastic phenomenon on rolling perform- 
  ance is illustrated in figure 4.30. 
  
  trolled in a sideslip to accomplish crosswind 
  takeoff and landing. The lateral control dur- 
  ing crosswind takeoff and landing is a par- 
  ticular problem when the dihedral effect is 
  high. Since the sweepback contributes a large 
  lift coefficients, the 
  dihedral effect at high 
  problem is most important 
  for the airplane 
  with considerable sweepback. The limiting 
  crosswind components must be given due re- 
  spect especially when the airplane is at low 
  gross weight. At low gross weight the speci- 
  fied takeoff and landing speeds will be low and 
  the controlled angle of sideslip will be largest 
  for a given crosswind velocity. 