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Subject: TWL: Prop Nozzles was Bollard Pull
From: Alex Hirsekorn (alexh@XXX.XXX)
Date: Tue Jul 02 2002 - 16:09:45 EDT
----- Original Message -----
From: <Albin43Tr@XXX.XXX>
Subject: Re: TWL: Bollard Pull
> (A Kort nozzle is a ring fixed permanently
> around the prop to increase its efficiency. They are usable for slow
speeds
> only as they create a large amount of drag at high speeds.)
Hi Wayne,
What you say about Kort Nozzles is true but there's a similar technology
available now that addresses the higher drag issue. "Speed Nozzles" give
somewhat less improvement in bollard pull than Kort's but they also give
more speed for a given amount of power than either Kort's or ordinary open
propellers
More information can be found at these sites:
http://www.karvi.com/technology/tech-speednozzle.htm
http://www.5throw.com/brtmarine/propellers.htm
These things seem to becoming all the rage for fishing vessels above 60 or
70 feet but I think that the smallest unit that's presently available is
sized for the Karvi 47 (It looks like about 36" in diameter).
Efficiently yours,
Alex
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