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Carl Heinzl <cgh@ma*.ai*.mi*.ed*> wrote:-

> A little more on the "propeller" idea... Propellers add rotational momentum
> to the water. Isn't then, an impeller more efficient (and, obviously safer)
> than a propeller?  I cannot comment on jet boats, but on jet skis, the water
> is propelled almost directly backward. In addition there is a "pump" that
> removes most of the rotational energy from the water. -Carl-

If the waterjet is produced by an impeller (= a propeller in a chamber), much
of the water that is sent sideways is still likely to end up as turbulence and
thus finally as warming the water, than as propulsive backblast.

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