With regard to the aircraft that changes wings to move from an airplane to a
motorglider, beware that the original classification is what the aircraft
stays at in the eyes of the FAA.
Thus, if you add longer wings to a airplane, it cannot become a glider. It
has to have been originally licensed as a glider.
Not sure about the other way around, though. If you have a licensed glider
and you put short wings on it, maybe it cannot be a glider, but it would not
be an airplane.
Colin
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