"Koopas Ly" wrote in message
om...
Climbout: same angle of climb for obstacle clearance at higher Vx speed.

Almost. It should be the same *angle of attack* (and higher speed) for best
angle of climb. But the angle of climb itself (and the pitch angle) will be
less than when within max gross weight. Consider the limiting case where
the aircraft is so heavy it can barely climb; the best angle of climb will
then be just slightly above zero.

Similarly, pilots who are not accustomed to high-altitude takeoffs can get
in trouble if they try to set up the same pitch attitudes they're used to at
lower altitudes for best-rate or best-angle climb. Due to the lower angle
of climb at higher density altitudes, commanding the usual pitch altitude
implies a higher angle of attack than usual, and hence a danger of stalling.

--Gary