Re: [Electric Boats] Torqeedo speed prop

 

Hi again Chris

I came to my mind that I recently saw a torqeedo video on youtube and there they use this new prop on a white boat called camus (http://www.youtube.com/watch?v=b_aTvv8IbR4). It moves fast for an electric motor, but that is not what was interesting. Interesting is the fact that they show a closeup of the remote control with the wattmeter showing 5457 watts. That is even more than the 4,8 kW you experienced on your boat. Seems there is quite a variation in power for these engines, or did they simply use higher voltage batterypacks?

Matti

--- In electricboats@yahoogroups.com, Chris Baker <chris@...> wrote:
>
> I now have one of the so called 'speed' props from Torqeedo, and if
> you are considering a Cruise 4, this prop is worthwhile.
>
> But not for the reason you might expect...
>
> First some background. The Australian Torqeedo distributor, Claude
> Desjardins, has provided me a 'speed prop' for testing on Current
> Sunshine. I understand it was designed for use on light planing hulls
> with a view to getting more top speed for them than the standard prop.
>
> Oddly enough it seems to make little difference to speed - and if
> anything is perhaps a little slower for top speed. Since I've had it
> I have not had the opportunity to test it under still conditions and
> so my tests so far have all been effected by wind. And even just a
> slight breeze can effect the results by .1 or .2 of a knot either
> way. Anyway, the top speed is still around about 6.5 knots.
>
> But what I really notice is its power in reverse. It way better than
> the standard prop. Many times better. And this big improvement in
> reverse is also confirmed by a friend who has two Cruise 4 on his Oram
> 45ft cat. He also notices very little change in speed, but a big
> improvement in reverse.
>
> The standard prop is orange and has very fine blades - the speed prop
> is white and its blades have more area especially towards the tips.
> So this is perhaps why it shows such an improvement in reverse. But I
> expect there are alos other more subtle shape changes as well that are
> helping here.
>
> Reverse on the standard prop can be really unsettling on any boat with
> substantial mass - and this would apply particularly to the sailboats
> of this group. For the original design target for these outboards,
> the small dinghy, reverse is not so important.
>
> But for sailboats manoeuvring in close quarters it can be critical.
>
> If you are thinking of getting a Torqeedo be sure to ask about the
> speed prop.
>
> Cheers
>
> Chris
>

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