I had a less than controlled test yesterday comparing 35 MPH (top speed) to 30 MPH, and so far it seems 30 MPH is more efficient. It did seem more efficient than when I flew at 20 MPH, but that is just a gut feeling. My guess is that when I do a more controlled test, that I will find somewhere around 30 to be the most efficient.
Unfortunately 18 MPH is the fastest orbit speed, so I won't be able to count revolutions to judge efficiency.
No good way to do a retractable landing gear without adding servos and other radios to control them.
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