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#11
March 17th 09, 06:13 PM
posted to rec.aviation.soaring
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Aerodynamics of Towing
On 17 Mar, 16:16, Darryl Ramm wrote:
Gravitational potential energy gained by soaring (climbing in lift) or by winching/towing/motorglider engine is the power source for gliding flight. So what's the power source when climbing in a thermal, when gravitational potential enegry is decreasing? If you take a 500m launch, you have 4,905kJ/kgof potential energy to play with - no more and no less. As we all know, that's about enough energy to keep a glider flying for ten minutes or so. For flights of any longer, another power source is needed, and though gravitational potential may be used as a store from time to time, it is only the store, not the source. Ian 
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