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Old 05-08-2012, 10:54 AM
Philster Philster is offline
Join Date: Aug 2000
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Posts: 10,488
Jet-type propulsion in boats:

Jets have been used to jet water to power boats and Waverunners, but be wary of the results, because jet boats will show worse fuel economy and top speeds, because the props on boats intended to plane also create lift, resulting in less wetted hull (less resistance).

Jet boats don't get this lift, so to do an apples to apples test, you need to power some non-planing hulls (displacement hulls) with jets and compare to displacement hulls with props.