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Old 06-26-2013
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Lightbulb Prototype-Video: Kite-Scooter to become fastest sail craft ever?

Following video is of a home made prototype, which performance-wise is yet far away from the supposed potential. I believe, however, that by putting sufficient R&D into it, the concept (which, if only launch/retrieval systems for big enough kites were available, also could be scaled up and turn any motor yacht into a high performance sail craft) could be turned into the fastest sail craft ever, not in absolute terms challenging the Sailrockets speed record obviously, but among viable sail craft of similar size competing on a race course.





Main reason for my certainly daring claim is the fact that sail/kite- and (hydro-)foil-generated forces in my kite-scooter are aligned, which leaves the sail craft completely free of sail induced heel, which actually is the main performance limiting factor of any conventional sailcraft (even incl. kite boards). This in turn allows for giant sail area(in my case 21sqm on a 35kg/2,80m boat), limited only by the (hydro-)foils capacity rather than ballast and lever arm.
The only other notable sail craft, as to my knowledge, to be free of sail induced heel, is the Vestas Sailrocket, which certainly supports my claim.
Very interested in opinions about my idea in general, its viability as a small pleasure sail craft and about my strong claim regarding its performance potential.

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Old 06-26-2013
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Prototype-Video: Kite-Scooter to become fastest sail craft ever?

Ingenious ! That certainly looks like fun.
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Old 06-26-2013
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Re: Prototype-Video: Kite-Scooter to become fastest sail craft ever?

looks like great fun! I can just imagine the kit carnage during a regatta
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Old 06-26-2013
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Re: Prototype-Video: Kite-Scooter to become fastest sail craft ever?

While impressive, it looks exhausting!

Jeff
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Old 06-26-2013
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Re: Prototype-Video: Kite-Scooter to become fastest sail craft ever?

Looks really cool, as long as you want to go downwind!
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Old 06-27-2013
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Re: Prototype-Video: Kite-Scooter to become fastest sail craft ever?

Quote:
Originally Posted by miatapaul View Post
Looks really cool, as long as you want to go downwind!
That is quite an unqualified comment, this thing is going upwind very well and you can even see it in the video during the jibe from 2:08 to 2:18.
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Old 06-27-2013
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Re: Prototype-Video: Kite-Scooter to become fastest sail craft ever?

agreed.. while I can't say if it can do close hauled.. it certainly does a beam reach well
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Re: Prototype-Video: Kite-Scooter to become fastest sail craft ever?

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Originally Posted by mad_machine View Post
agreed.. while I can't say if it can do close hauled.. it certainly does a beam reach well
I had only very limited time for testing, as the monsoon started shortly after completing the prototype (and it will be around for another 2-3 months).
I have sailed effortlessly at around 60deg off the true wind, but I could have done little better. While that is certainly far less than most dinghies sail(~45deg?), the VMG wasn't that bad, considering that this is a home-made prototype with lots of room for improvement.
Race course kite boards can even beat foiling moths in the right conditions on a course, so the times when upwind performance of kites was generally poor are certainly over:
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Re: Prototype-Video: Kite-Scooter to become fastest sail craft ever?

I think playing with the design, you can get up close to where the Dinghys get close hauled.

The neat part is, it looks amazingly simple
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