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It was my suggestion to an engineer who wanted to create a bath tub that was propelled in the air by 6 or 8 electric propellers.
He was complaining about low range.
Especially for in the air, you'll want to keep things as light as possible, so I suggested him to use a small (~100cc) 2 stroke engine to use as main propeller, to keep him in the air; while electric propellers are more effective for short boost bursts, which can be used to create stability with wind gusts, or turning the vehicle.
For cars, weight isn't that important, and 4 strokes might be better.
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