Quote:
Originally Posted by DFC
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The only thing an engine gives us is the thrust force acting along the thrust line which we can use to maintain a constant airspeed without having to rely on gravity.
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There is no problem whatsoever maintaining a constant airspeed in a glider - one of the early parts of glider ab initio training is learning to control airspeed and do it by attitude.
The engine lets you do it without losing height.