text: given to the airplane size. For geometrically 
  similar airplanes, a certain deflection of the 
  
  the critical speed, with some limited amount 
  of force applied by the pilot (usually the limit 
  of lateral force is assumed to be 30 lbs.), the 
  Pb 
  ailerons cannot be held at full deflection, ~~ 
  
  I!!. 
  ailerons will produce a fixed value of zlr mde- 
  
  pendent of the airplane size. However, the 
  roll rate of the geometrically similar airplanes 
  at a given speed will vary inversely with 
  the 
  span, b. 
  
  drops, and rate of roll decreases. In this exam- 
  ple, the rolling performance at high speeds is 
  limited by the ability of the pilot to maintain 
  full deflection of the controls. 
  In an effort to 
  reduce the aileron hinge moments and control 
  forces, extensive application is made of aerody- 
  namic balance and various tab devices. How- 
  ever, 100 percent aerodynamic balance is not 
  always feasible or practical but a sufficient 
  
  Thus, the smaller airplane will have an ad- 
  vantage in roll rate or in time to accelerate 
  through a prescribed angle of roll. For ex- 
  ample, a one-half scale airplane will develop 
  twice the rate of roll of the full scale airplane. 
  This relationship points to the favor of the 
  small, short span airplane for achieving high 
  roll performance. 
  
  Pb 
  ZV 