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Solar aeroplane top speed at high altitude.

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topspeed100

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May 4, 2009
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4,063
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Oulu/Finland
I read Solar Impulse cruises 70 km/h at 15 km using only 7 kw. How does the speed for light aircraft actually change at high altitude..what are the benefits. How fast could 12 x more punch (better power to weight ratio ) having plane go in 15 km ? What equations apply ?
 
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