text: static directional-or weathercock-stability 
  of an aircraft. This effect may be appre- 
  ciated by inspection of hgure 3.13 which 
  shows the swept wing in a yaw or sideslip. 
  The wing into the wind has less sweep and 
  increase in drag; the wing away 
  a slight 
  the wind has more sweep and less 
  from 
  drag. The net effect of these force changes is 
  to produce a yawing moment tending to 
  retarn 
  the relative wind. 
  is 
  This directional stability contribution 
  usually small and of importance in tailless 
  aircraft only. 
  
  the nose into 