text: size, and high kinematic viscosity RN= 
  (  3 
  
  Thus, small surfaces, low flight speeds, or very 
  high altitudes can provide the regime of low 
  Reynolds Numbers. One interesting phenom- 
  enon associated with 
  low BN is the high form 
  the low energy 
  drag due to separation of 
  boundary layer. The ordinary golf ball oper- 
  ates at low RN and would have very high 
  form drag without dimpling. The surface 
  roughness from dimpling disturbs the laminar 
  boundary layer forcing a premature transition 
  to turbulent. The forced turbulence in the 
  boundary layer reduces the form drag by pro- 
  viding a higher energy boundary layer 
  to 
  allay separation. Essentially the same effect 
  can be produced on a model airplane wing by 
  turbulent 
  roughening the leading edge-the 