> Wind is doing work on a glider, in an updraft, it increases potential energy (gravitational) or kinetic energy if the pilot corrects for the updraft. In a downdraft, it decreases potential energy, or kinetic energy (if the pilot corrects for it and it doesn't stall). Changes in wind speed, or flying across a wind shear boundary can also affect energy (a planes kinetic energy is relative to a constant velocity reference, usually the air it's flying in, if the relative wind changes, a plane will eventually gain or lose energy with respect to it's original reference). < Would you call that part of dynamic soaring? Regards, YK Chan RCSE-List facilities provided by Model Airplane News. Send "subscribe" and "unsubscribe" requests to [EMAIL PROTECTED]
