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I've spoken with a pilot or two about retracting the gear on take-off. Each one said they'd get the gear up and take the additional altitude that comes with that--good in the event an engine goes out.
What I found interesting was that the hp required increases with V cubed. I'd already done the math for the drag equation for my truck...to see what drag I needed to aim for in order to achieve the fuel mileage I'm after. But v^3? Wow. Some good reading. Thanks for sharing.
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