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From what I remember about propellers, I think it was around 59% energy transfer before it was easier for the air to move around the propeller.
The big advantage is not relying on the wheels for traction, like has been stated, and in the old magazine clippings that is what was stated as well, ideal for low traction areas like mud, grass, ice.
When I've driven an air boat, that is a boat with a flat bottom and a large prop in the back, it was very much a fluid drive, like driving a vehicle with a very loose automatic transmission.
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