Here's a slight variation on the question:
You are in a glider on the downside of a lazy eight at 70-80 kt. heading downhill.
Why does the glider level off and gain altitude when you pull back on the stick?
Note that while the longitudinal component of gravity was substituting for thrust on the way down, that component has joined forces with drag on the way up.
Last edited by RatherBeFlying; 8th November 2012 at 05:03.