SR-72 canard H fin

What works and what doesn't. Share design ideas, references and contacts for paipo board builders.

Re: SR-72 canard H fin

Unread postby CHRISPI » Tue Jun 06, 2017 7:57 am

Thanks Bret. Seems to be no down side to two wings, hard to understand why there seams to be less drag now than before. I haven’t had it in big conditions, but this one has been fun to test
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Re: SR-72 canard H fin

Unread postby Wooddave » Thu Jun 08, 2017 4:09 pm

Hi Guys,,
awesome work as always Crispi
I'm Just guessing of course but,I think that the decrease in drag (or lack of increase)may be due to the disturbance caused by the front wing, which may break up the water so to speak clearing a path for the rear wing.
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Re: SR-72 canard H fin

Unread postby CHRISPI » Tue Jun 13, 2017 6:16 am

Thanks Dave, I am pleased with the layered deck pad not perfect but for a first time experiment not bad. I like the idea (lack of increase in drag).It feels like it’s not as good as it was holding horizontal high lines. But take offs, bottom turns and making slow sections has improved significantly, maintains momentum well .This board makes mush fun .
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Re: SR-72 canard H fin

Unread postby CHRISPI » Sat Jun 17, 2017 8:25 pm

I have just had the most amazing session in my life with this board resetting the my bench mark best waves ever
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Re: SR-72 canard H fin

Unread postby CHRISPI » Sat Jun 17, 2017 8:27 pm

CHRISPI wrote:I have just had the most amazing session in my life with this board resetting the my bench mark best wave ever
CHRISPI
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Re: SR-72 canard H fin

Unread postby Wooddave » Wed Jul 19, 2017 7:06 am

Hi Crispi,
glad to hear you're enjoying your success with the latest model.
I'd love to see that thing in action.
I've been working on a few new designs. I've got three built and have two more configurations to build for more comprehensive testing.
I have only tested two of them in the pool but they have some pretty interesting characteristics even in there.
I took some (bad) video of the test and will post it on you tube when I get a chance to edit it.

IMG_2003.JPG


IMG_2001.JPG

the design is a continuation of my earlier designs in that before I was attempting to create the rear channels through flex.
these have the channels built into them, they're made from 3mm ply with carbon in between and on the bottom.
my prototyping capacity has expanded considerably since acquiring my laser cnc.
I can now easily produce variations on a theme, though as you know actually building them is a little more time consuming.
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Re: SR-72 canard H fin

Unread postby CHRISPI » Thu Jul 20, 2017 5:17 am

Dave WOW that is thought provoking .Very very interesting, I see a convex Mylar plastic sheet joining the two boom tails that is thin enough to go concave at speed
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Re: SR-72 canard H fin

Unread postby Wooddave » Mon Jul 24, 2017 6:59 am

Thanks, funny you should mention the Mylar sheeting, I have toyed with that idea, I'm still researching the best material and method of attachment, but I have envisioned a foil that is only a minimal frame with interchangeable (fabric?) skin for varying conditions. That is at least three generations away. For now I want to work on figuring out a shape that has similar flight characteristics to conventional foils except with an improved turn radius....
I put the foils to board and gave them a try in the surf yesterday and :D :D :D :D

IMG_2025.JPG

It was small surf but the foils worked wonderfully,, especially the longer one
As you might notice the board is just a skimboard with a layer of 1 inch Sea Deck foam

IMG_2023.JPG


I also realized that I am in horrible shape and I need to work on that as well
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Re: SR-72 canard H fin

Unread postby SURFFOILS » Fri Sep 01, 2017 5:56 pm

Great work you two. Dave, what feeling did you get from the longer foils ?
CRISPI, do you think the two foils create a longer 'wheelbase' rather than a single, I'm using a length of 23 inches that's very stable.
Have you seen the current commercial foils with masts up to 3 feet deep ? Crazy.
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