Hi Reid.
I did wonder about the diver towing units. As far as I know they all
use a prop-shaft drive from the torpedo body. This makes sense as they
have to have the long body anyway.
The rim-drive ring thrusters I am thinking of would be a smaller version
of those shown in this recent news release:
http://www.superyachtnews.com/products/18095/schottel_to_develop_superyac
ht_rimthrusters.html
I guess the URL will be wrapped around, so make sure you use all of it!
These are MUCH larger then anything of interest to us, with the lowest
power one being 200kW, but you get the idea.
I take your point about jamming of a ducted fan. This is why it needs
to be fairly easy to lift or swing the unit out of the water for
cleaning or even un-jamming.
Regards,
Chris.
In message kcd296+3mb6@eGroups.com>, Reid axius@telus.net> writes
>Chris,
>Many years ago I worked on a shallow draft tunnel hull tug named the
>BIG MAC. Vessels of this configuration were common. 1/2 of the prop
>was open from the bottom, but the entire prop with in the tunnel. The
>vessel could be safely beached on any smooth area.
>
>In the 1970's I had a 30" diameter prop built with an integral thrust
>ring cast on it. Airfoil shape, flat on the outer surface. Although
>it provided a sizable boost in Bollard Pull, there was no gain when
>running without a tow. As we operated in water with lots of debris,
>the risk of getting something jammed in a ringed prop far outweighed
>any potential gain in thrust.
>
>I am not sure I understand your design of the duct holding the stator,
>but one would think the drag created from the cross sectional area
>makes it a non-starter?
>
>Any of the Chinese BLDC motors, which are available up to 10KW could be
>used in a Stoke Monkey configuration to power a conventional shaft
>prop; http://www.youtube.com/watch?v=SN3SXISavFw
>Motor, controller and throttle are available as a kit.
>They could also be used with a suitable thrust bearing and coupling
>directly on the end of the shaft.
>I have a 3KW system, 60V 40Ah. Total cost including Thundersky cells,
>charger and scooter, $1200. Purchased new on eBay;
>http://www.alibaba.com/product-gs/643167780/3000W_Electric_Scooter_3000W
>_Electric_Motorcycle.html
>People smash these up all the time and the end up at scooter dealers or
>junk yards. Low Budget option?
>
>There are many suppliers of electric aqua tow devices for extending the
>range of divers. A ducted fan, motor and controller all in the
>package. Not powerful enough for your application, but perhaps some
>useful ideas? http://www.scubatow.com/
>
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