I can't imagine (with my limited imagination) that a powered propeller could be more efficient than driving the wheels. In any case, this one wasn't the vehicle which set the record. The 126mph vehicle was purpose built with a single outrigger, and taller wing and no prop.
Yes, I know it's an old thread, but it seems to be reborn.
__________________
FB
Chain-L site
An ounce of diagnosis is worth a pound of cure.
Just because I'm tired of arguing, doesn't mean you're right.
“One accurate measurement is worth a thousand expert opinions” - Adm Grace Murray Hopper - USN
WARNING, I'm from New York. Thin skinned people should maintain safe distance.