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Originally Posted by Ryland
I think it was around 59% energy transfer
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I wonder if that is under acceleration or at constant speed, and fixed or variable pitch. A conventional drive will lose between 10-25% from friction and pumping (auto), so that's not too terrible.
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Originally Posted by jamesqf
Of course the real question is why?
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FAR 103, and not wanting to be limited to location.
A ducted fan or shrouded prop would help the stop and go, allow or a low prop (CG), and make shielding easy. With pitch control the drag losses might be comparable to a unshrouded/ducted, fixed prop at speed. Both of those add weight though. Maybe some emergency floats could offset that.
Did some research, oddly enough there is no law against driving with a prop, so long as your wheels don't kick up rocks.
There's also the possibility of hydrostatic, but that's heavy and inefficient too.