text: The maximum level flight speed for the air- 
  plane will be obtained when the power :or 
  thrust required equals the maximum power or 
  thrust available from the powerplant. The 
  minimum level flight airspeed is not usually 
  defined by thrust or power requirement since 
  conditions of, stall or stability and control 
  problems generally predominate. 
  
  CLIMB PERFOLWANCE 
  
  the airplane gains 
  flight, 
  potential energy by virtue of elevation. This 
  increase in potential energy during a climb is 
  provided by one, or a combination, of two 
  means: (1) expenditure of propulsive energy 
  above that required to maintain level flight or 
  (2) expenditure of airplane kinetic energy, i.e., 
  loss of velocity by a zoom. Zooming for alti- 
  tude is a transient process of trading kinetic 
  energy for potential energy and is of considera- 
  for airplane configurations 
  ble 
  which can operate at very high levels of kinetic 
  energy. However, the major portions of climb 
  performance for most airplanes is a near steady 
  process in which additional propulsive energy 
  is converted into potential energy. The funda- 
  mental parts of airplane climb performance in- 
  volve a flight condition where the airplane is 
  in equilibrium but not at constant altitude. 
  
  During climbing 