SR-72 canard H fin

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SR-72 canard H fin

Unread postby CHRISPI » Fri May 05, 2017 2:05 pm

My best board in for overhaul and update
Attachments
GOPR1427.JPG
Original board
GOPR2424.JPG
GOPR2421 (2).JPG
GOPR2426.JPG
GOPR2425.JPG
CHRISPI
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Re: SR-72 canard H fin

Unread postby jbw4600 » Fri May 05, 2017 6:42 pm

Looks good!! I wish could I try one out. What this deck padding material you use?
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Re: SR-72 canard H fin

Unread postby CHRISPI » Sat May 06, 2017 6:48 am

The deck pad is a first time experiment that worked out ok, three layers of Polyethylene foam
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Re: SR-72 canard H fin

Unread postby SJB » Sat May 06, 2017 12:57 pm

I still dont get the concept...seems like built in drag and turn resistance. Color me skeptical. Need a test drive.
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Re: SR-72 canard H fin

Unread postby CHRISPI » Sat May 06, 2017 5:02 pm

I can’t seem to explain how it works, the canard board has not been tested . It has the same lifting surface area as most surf boards but stacked into the zone in contact with the wave face. And only the left or right side is in contact with the water .And my explanation how it plains up on the wing tips does not seem to be understood .In the transition zone between displacement and plaining the foiled hull holds onto lift longer than displacement hulls that surfboard etc are off the plain, a car person would understand this as having lots of torque , my boards takes off quickly and holds onto speed in flat sections , takes off on small weak waves like a long board, but holds a horizontal line in the vertical zone on the wave face .The operating zone or parameter have been expanded hugely .
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Re: SR-72 canard H fin

Unread postby SJB » Sat May 06, 2017 10:45 pm

Hope to try it some day. I am no techie...i.e. everytime I get on an airplane I am skeptical it will get off the ground....but it works.
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Re: SR-72 canard H fin

Unread postby CHRISPI » Mon May 08, 2017 6:54 am

First test ride on Sunday ,very weak wave 1m at 8 sec , I expected increased drag was going to be an issue but there seems to be less drag than before , so confusing may be some sort of nozzling or focusing effect of the boundary layer ??. Lots more testing needed I LOVE IT . Coanda effect ??
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Re: SR-72 canard H fin

Unread postby Ted » Mon May 15, 2017 2:48 am

This reminds me of a prone board I saw that had a metal hydrofoil extending downward about 12 inches. As I remember, the builder said he paddled it upside down to get outside and flipped it over and kicked hard to take off. Seemed like it could get very exciting to run into anything.
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Re: SR-72 canard H fin

Unread postby CHRISPI » Wed May 17, 2017 7:28 am

Hi Ted
The fin tips extend 10 cm down from the deck, less than most surf board fins, riding flat over people is safe .But when turning around carelessly dangled legs in the wave face the fin extends horizontally outside my hip area. I have gashed a leg and some boards
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Re: SR-72 canard H fin

Unread postby SURFFOILS » Tue Jun 06, 2017 7:18 am

Crisps, that's just the hottest looking board ever !
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