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#11
October 11th 05, 06:27 PM
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"Gene Whitt" wrote in message nk.net... Y'all, Been many years on rec.aviation.student but even more years since gliding. Unable to explain the 'why' of water ballast to increase performance in gliders to argumentative airplane student. I need a simple explanation in 25 words or less. Gene Whitt All good answers. I would add that an examination of two polars for a particular glider, one ballasted and one not, will show a crossover airspeed above which the sink rate with ballast is less than without - very counterintuitive. Most modern gliders flying in conditions with greater than 2Kt thermals will spend 80% of their X/C time flying at airspeeds above the crossover point where the sink rate is reduced by using ballast. Flying fast with reduced sink is dramatic. Bill Daniels |
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