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Old 3rd September 2006 | 12:13
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Jetstream Rider
 
Joined: Oct 2002
Posts: 291
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From: Heathrow
Compressibility is usually more to do with speed than altitude. Below about Mach 0.3 you can disregard it in most circumstances. Gliders fly at much less than that, so I doubt it is a problem.
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