Optimum climb angle for a no-flaps departure. Nothing to do with 50ft over the end of the runway. Sometimes runways are different lengths. The reference to 50ft is meaningless without a distance.
The others are-
Angle of climb for obstacle clearance= shortest distance covered to 50ft. Flaps down.
Rate of climb for optimum height gain= longer distance covered to 50ft. Flaps down.
Last edited by Flyingmac; 8th Aug 2017 at 07:45.