text: SPINS AND PROBLEMS OP SPIN 
  RECOVERY 
  
  The motion of an airplane in a spin can 
  involve many complex aerodynamic and in- 
  ertia forces and moments. However, there are 
  certain 
  regarding 
  spins and spin recoveries with which all 
  The spin differs 
  aviators should be familiar. 
  from a spiral dive in that 
  the spin always 
  involves flight at high angle of attack while 
  the spiral dive involves a spiral motion of 
  the airplane at relatively low angle of attack. 
  The stall characteristics and stability of 
  lift coefficients are im- 
  the airplane at high 
  portant in the initial tendencies of the airplane. 
  As previously mentioned, it 
  is desirable to 
  have the wing initiate stall at the root first 
  first. Such a stall pattern 
  rather than 
  prevents the undesirable rolling moments at 
  lift coeGients, provides suitable stall 
  high 
  
  fundamental relationships 