On Sun, 26 Dec 2004 at 21:58:05 in message
, Peter Duniho
wrote:
Thrust does contribute, yes. But the primary reason for requiring
additional power is that, while the wing is capable of generating the
necessary thrust at a lower airspeed, higher angle of attack (all the way up
to the stalling AOA of course), the higher angle of attack results in higher
drag, requiring higher thrust.

I think Peter that an aircraft will climb if trimmed to the same angle
of attack that it was using in level flight. It does this as long as
the lift is slightly less and the speed drops to produce _less_ drag
and lift, leaving more engine power and thrust to climb.

When climbing extra work must be done against gravity. That extra work
can come from increasing power or from reducing speed and therefore
drag.

Nitpicking point: wings do not create thrust! :-) You meant lift of
course.
--
David CL Francis