text: The most immediate interest in the climb 
  angle performance involves obstacle clearance. 
  The maximum angle of climb would occur 
  where there exists the greatest difference be- 
  tweenthrust available and thrust required, i.e., 
  maximum (T-D). 
  Figure 2.21 illustrates the 
  the curves of 
  climb angle performance with 
  thrust available and thrust 
  required versus 
  velocity. The thrust required, or drag, curve 
  is nss,~pued to be ppw=n*~r;.rP nc CnmP +-+a! 
  airplane configuration which could be powered 
  by either a turbojet or propeller type power- 
  plant. The thrust available curves included 
  are for a characteristic propeller powerplant 
  and jet powerplant operating at maximum 
  output. 
  
  y.“-  ..I‘..&. c “I ““IILL ‘, y 
  
  The thrust curves for the representative pro- 
  peller aircraft show the typical propeller thrust 
  which is high at low velocities and decreases 
  with an. increase in velocity. For the pro- 
  peiler powered airplane, the maximum excess 
  thrust and angle of climb will occur at some 
  speed just above the stall speed. Thus, if it 
  is necessary to clear an obstacle after takeoff, 
  the propeller powered airplane will attain 
  maximum angle of climb at an airspeed con- 
  veniently close to-if 
  takeoff 
  speed. 