text: Roll helix angle=&;  (radians) 
  
  where 
  
  p=rate of roll, radians per second 
  
  6=wing span, ft. 
  
  V=airplane  flight velocity, ft. per sec. 
  
  and, one radian=S7.3 degrees 
  
  pb 
  Generally, the maximum values of rVobtained 
  
  by control in roll are approximately 0.1 to 0.07. 