The thought just came across my mind and I simply cannot think of a good answer, especially not knowing much about the mechanics of it all.
In: Engineering
Having disturbed air entering the propeller on an aircraft creates a great deal of vibration. Escape in the air may also be more dangerous. There are lots of advantages to a tractor configuration!
Boats do not have a major issue of disturbed water entering their propellers because of the pressure profile around the hull. Also the speed, fluid density and viscosity regime results in a much smaller boundary layer of fluid. Basically a propeller on the back of a boat is pretty much operating in free stream, unlike one on the back of a ‘plane.
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