Hi Tim,
I don't know any specifics about the jet drive that you're talking about, but the Dyson "fan" is a lot like a typical jet pump with an exotic nozzle.
"Calling the Dyson Air Multiplier a fan with no blades is perhaps a touch misleading. There are blades in the fan -- you just can't see them. The pedestal hides the blades...." So it is really a ducted fan with the prop (impellor) in the base.
I would very surprised to see objective test data that showed a water drive configured like that was more efficient than a regular prop drive at thrust values above 10 pounds or more. Though I could believe that it might work ok for a very low power trolling motor.
Fair winds,
Eric
Marina del Rey, CA
--- In electricboats@yahoogroups.com, "Tim" <haywardt@...> wrote:
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> .... For shallow drive and in weeds I know of a patent on a small jet drive that was made for foldboats and canoes that worked like the Dyson blade-less fan. It was highly efficient and worked very well in shallow water and weeds. It might be worth resurrection.
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