If you read the website they clearly state that it is a jet, and their goal is higher speed, not efficiency… Seeing as these folks have been in business for quite a while and build a variety of jets (check out the rest of the site), I’ll argue they know a little bit about what they are doing…. I’ll keeping tuned to see what they come up with.
Kevin
From: electricboats@
Sent: Friday, November 06, 2009 8:19 AM
To: electricboats@
Subject: [Electric Boats] Re: Emerging technology - hopefully lower cost
The website doesn't call it a Kort Nozzle, which is good, because it ain't! Kort nozzels have an airfoil-like cross section and the exhaust opens up in diameter, not restricts like this does.
What this unit is doing is creating a semi-jet system. It isn't a true jet because they are using a truncated propeller (which a Kort nozzle uses, too) and not an axial impeller that true jet systems use.
I would be surprised if this works. They are creating the jet exhause (high speed exhaust) under water. The friction between water to water is great and causes a lot of power-robbing turbulence. There is a reason jet systems exhaust above the water line. One under water jet system injects air all around the nozzle exit to help with this friction. And, it is going to be a fouling nightmare.
Torqeedo has the right idea. Spin a larger prop slower for more efficiency.
--- In electricboats@
>
> I'm interested in small (12-18ft) electric boats for fishing, play etc, and
> like the cost of trolling motors. I saw this today which is an interesting
> improvement on the trolling motor concept.
>
> http://www.marineje
>
>
>
> I'll be keeping my eye on it.
>
>
>
> Kevin
>
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