Neil wrote : Well, in water an efficient screw design will look a
lot
different than an efficient prop that runs in air ........
I believe you hit the nail on the head ! I've seen a lot of
airplanes since
the late 30s with two and three bladed props ( and four on bombers ),
but none of the subs I ever saw had two or three blades . Most of the wind
generators I see when we go into California's Cental Valley ...... at Altamont
Pass, I think, have two or three blades, also . I never saw any Savonius Rotor
type generators there, but they are used in some locations .
Bruce ....... 34 years at Electric Boat where our only finished
product was Submarines .
PS : possibly Bushnell's "Turtle" had only two blades, powered by the
sailor inside ! It was launched just a few miles from my home, in nearby
Old Lyme, Connecticut, and Benjamin Franklin was there that day to assist
and observe ....... a bit before my grandfather's time .
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