Sounds perfect for a sail boat!
Seems to be pretty promising, possible lack of acceptance earlier in it's history was that when it was designed, it was easier to simply go with a bigger motor if you needed more power, today's energy situation tends to make the more power approach less appealing.
would anything else require building up to handle the increased thrust?
Ken.
> To: electricboats@
> From: ewdysar@yahoo.
> Date: Mon, 16 Nov 2009 05:04:14 +0000
> Subject: Re: [Electric Boats] Emerging technology - hopefully lower cost
>
> Ludwig Kort applied for a patent for a Kort nozzle in 1938, so I wouldn't exactly classify this idea as an emerging technology. That said, Kort nozzles can provide a 25-30% improvement in thrust at low speeds, the shrouding causes extra drag that negates their advantage at speeds over 10 knots. These devices may not provide much of an increase in speed over un-ducted blades, but they will be able to move heavier boats, which may be an advantage after adding 1000 pounds of batteries to electric conversions.
>
> Fair winds,
> Eric
> 1964 Cheoy Lee Bermuda 30 - Serenity
> Marina del Rey, CA
>
>
>
> --- In electricboats@
> >
> > Here is a video showing the Kort Nozzles on a tug boat. Notice the shape of the propeller inside the nozzle. The maximum blade width is right at the interface of the nozzle and the propeller. Using a standard propeller that has not been modified in a Kort Nozzle shape is worse than no Kort Nozzle at all. The increases thrust at low speeds comes from being able to eliminate the 20-25% of the prop blade tip that is inefficient and using the nozzle to contain any off-tip water flow. For the same diameter propeller, the Kort Nozzle prop can have significant more surface area interacting with the water resulting in greater amounts of water being moved which equates to more power.
> > http://www.youtube.
> >
>
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