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The advertising of the Super SkyRocket said max speed 300 MPH, cruise speed 250 MPH, that was all at 20,000 feet. On an ISA day, flat out, you could achieve a true air speed of 300, they said. No one would fly flat out, for more than 5 minutes, at any altitude. The cruise, again, was at 75% power, and again at 20,000, oh and at medium weight.
That all translates to advertising stuff, and the theory that as altitude is gained, resistance is lessened.
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