text: employ an offset flapping hinge to increase the 
  control effectiveness by creating a centrifugal 
  force couple when the rotor is tilted. This is 
  shown in figure 4.35. 
  
  The rotor is tilted by taking advantage of 
  the gyroscopic effect of the rotor system. This 
  effect causes a rotating mass which is disturbed 
  about one axis to respond about another axis, 
  as shown in figure 4.35. A forward tilt to the 
  rotor is obtained by decreasing the pitch of the 
  blade when at the starboard position and in- 
  creasing the pitch of the blade when at the 
  The lateral dissymmetry of 
  port position. 
  for- 
  lift which results causes the rotor to tilt 
  ward by the gyroscopic effect. 
  
  A differential blade pitch change like this 
  is called a cyclic.pitch change since each blade 
  goes thr0ugh.a complete cycle of varying pitch 
  angles as it completes one revolution of rota- 
  tion about the hub. A cyclic pitch change is 
  accomplished by the pilot by the use of the 
  cyclic stick. The control arrangement is such 
  that the rotor tilts in the same direction that 
  the cyclic stick is deflected. 
  
  A variation in rotor thrust is accomplished 
  by increasing>sthe pitch of the blades simul- 
  taneously or collectively. This type of control 
  and is ac- 
  action is called “collective pitch” 
  complished by the use of the collective pitch 
  stick. 
  In operation, the cyclic stick is an- 
  alogous to the control stick of an airplane, 
  and the collective stick is analogous to the 
  throttle ~of an ,airplane. 