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Immigrant board Mk2

Posted: Mon Jul 01, 2019 11:44 am
by CHRISPI
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Made with a full width core of two layers of 5mm xps held together with 6oz cloth, plus a full length 5mm thick 20mm wide 3d core foam strip to reduce bending. Covered with 20 mm polyethylene top and bottom, for buoyancy .1130 long, 560mm at midpoint, and 660mm between wing tips. The idea is to smooth out the rail turbulence, making the rail generate more lift with less drag .Ways 6lbs. I am having lot of problems with the epoxy leaving blow holes causing the paint to bubble
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Re: Immigrant board Mk2

Posted: Mon Aug 26, 2019 6:21 pm
by Atlantasurfer
Great design as always. Do those side wings increase speed or decrease it?

Re: Immigrant board Mk2

Posted: Thu Aug 29, 2019 4:00 pm
by CHRISPI
The lift to drag ratio of a winglet is better than a sliding rail, so the same lift with less drag. So at the same speed a wing will have less parasitic drag compared to a sliding rail were the low pressure wake is mostly unattached

Re: Immigrant board Mk2

Posted: Sat Aug 31, 2019 10:18 pm
by bgreen
Looking at your board, I was thinking you could make one without the wings, but include an attachment so you could fit different size wings, like FCS.

They could also be trialled on a standard board, if the rail was flat enough or there was a specific shape, that allowed for this.

Re: Immigrant board Mk2

Posted: Sun Sep 01, 2019 10:17 am
by GeoffreyLevens
Another option for removable/changeable wings could be morphed off the Greenough bolt on fin idea in attached .jpg's. Maybe flat metal strap bolted into wing, wrap around board and bold through. Only hard part really would be matching shape of wing edge to board rail for tight fit. Not sure of could be done strong enough but might be fun to play with

Re: Immigrant board Mk2

Posted: Mon Sep 02, 2019 1:10 pm
by CHRISPI
I have been thinking about a box fitting to run stand-up board fins horizontally on the rails .lots of interesting profiles to test. Not certain they can handle full horizontal side load.