I am not saying you are wrong, but they have a variable pitch propeller and according to this paper it seems that it is preferable for thrust to be generated from the propeller to the wheels rather than parachuting up to speed.
http://www.ijsrp.org/research-paper-...srp-p16135.pdf and the paper makes no mention of drag from the propeller pushing it up to speed.
Quote:
In 2006, Jack Goodman [8] explained that the correct gearing
of the propeller to the wheels of the car will speed up the car if
energy is available from a tailwind.
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