Thought experiment

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Thought experiment

Unread postby CHRISPI » Thu Aug 17, 2017 11:57 am

My next crack pot experiment .Concaved scroll wedge v twin
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GOPR2458.JPG
GOPR2460.JPG
CHRISPI
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Re: Thought experiment

Unread postby bgreen » Thu Aug 17, 2017 5:30 pm

Chrispi,

This is a radical looking board, especially the tail view. Is it meant to be ridden finless? I ask this because there is a lot going on, on the bottom.

Has the other board been glassed.

Bob
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Re: Thought experiment

Unread postby CHRISPI » Fri Aug 18, 2017 6:24 am

Bob
The scroll tips will grow about 10 mm when glassed, sort of finless. The other board has its deck pad on, but I am battling to finish the clear coat we are having cold wet weather for the last 4 days battle with runs when it’s cold.
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Re: Thought experiment

Unread postby bgreen » Fri Aug 18, 2017 8:05 am

You are quite right. I wasn't sure if you planned to add fins as well.
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Re: Thought experiment

Unread postby GeoffreyLevens » Fri Aug 18, 2017 9:43 am

I don't know doodely about hydrodynamics but won't the concavity down the center, between the scrolls, since it narrows as it goes back, create a lot of drag? All concaves I have ever ridden open up towards the tail... I'd love an explanation of any theory or if you have already ridden something at all similar.
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Re: Thought experiment

Unread postby CHRISPI » Fri Aug 18, 2017 10:26 am

Good question a prone board rides about 15degres off centre to the wave face, I am trying to harness the wash energy that is normally lost outwards. I have never been happy with concaves that exit parallel with the centreline.It’s also an inverted keel ,told you it is a crack pot experiment
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Re: Thought experiment

Unread postby GeoffreyLevens » Fri Aug 18, 2017 11:23 am

Definitely an interesting concept and a cool look. Eagerly awaiting ride report!!! Always good to remember that those crackpot experiments sometimes yield pure gold.
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Re: Thought experiment

Unread postby Pes78 » Sat Aug 19, 2017 11:04 pm

Thank you for the inspiration Chrispi. I was going to go with a flat bottom with maybe a little vee in my next board, but you have changed my mind. I need to just go for it on this next board with what I'm going to do. Plan on doing the bottom I did on the finless board I did early this year and really spoon out the deck. Thank you.
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Re: Thought experiment

Unread postby CHRISPI » Sun Aug 20, 2017 11:04 am

I make miniature models to visualise the board in the blank before I start cutting , I use 50 mm ESP sheets, and I think moulded surfboard blanks restrict innovative shapes
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Re: Thought experiment

Unread postby Pes78 » Sun Aug 20, 2017 5:44 pm

If you getting the insulation sheets and glassing yourself I assume you can get away with that. The blank I'm getting is a mould but also not a close tolarance blank like you would see from US blanks. I'll admit here that I'll be cheating with the next board by not doing a outline just cutting 6" off the tail and a 1/2" from the nose. Going to focus my energy to spooned out deck.
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