FORCES ACTING ON THE AIRPLANE DURING  TAKEOFF  ROLL  LlFT,L7  /’  ,-THRUST (PROPELLER), T  ,/  /  THRUST (JETI,T  /  /’  ‘ \  (T-D-F)  /  ‘ 1  NET  ACCELERATING  /’  FORCE  (PROPELLER)-  ,  I  ’  (T;&F)  CONSTANT  a  ACCELERATING  INNING  WHICH IS ESSENTIALLY  POINT OFF  OF TAKEOFF  PROPORTIONAL TO DISTANCE  TAKEOFF  ROLL  IN UNIFORMLY ACCELERATED  MOTION  Figure 2.32. Forces Acting on the Airplane During Takeoff Roll  186  NAVWEPS O&601-80  AIRPLANE PERFORMANCE 