Alex wrote:
Totally irrelevant. The answer is the same for a glider being towed to
take-off by a ground vehicle (except that you would want to change the
rear end or wheel size of the vehicle to cut the final drive ratio in
half, so that it could attain the doubled wheel speed necessary to
attain the needed forward speed.)

Just as the propellor on a plane is independent of the treadmill, the
tow car in your scenario must also be independent of the treadmill, ie.
running along side on solid ground while the glider is on the
treadmill. Co-Peach? (That's my Italian LOL)

The Monk