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Grafting a step-tail onto a SUP- Hope it works
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d0uglass



Joined: 28 May 2004
Posts: 1053
Location: Bonita Springs, Florida

PostPosted: Mon Dec 23, 2013 12:59 pm    Post subject: Grafting a step-tail onto a SUP- Hope it works Reply with quote

I've got a new project underway in which I'll be trying to convert my conventional sailable SUP (Angulo Surfa 10'4") into a WindSUP that can plane. I've epoxied a wedge of foam to the tail to make a flat rocker section, and carved it into a swallow-tail, kind of like the back end the AHD SeaLion. I'm going to put twin fins in it and won't normally use the existing fin box. We'll see if it works.

http://jimbodouglass.blogspot.com/2013/12/good-florida-christmas-vibes-windsup.html



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Sailboarder



Joined: 10 Apr 2011
Posts: 395

PostPosted: Mon Dec 23, 2013 3:28 pm    Post subject: Reply with quote

Cool!
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U2U2U2



Joined: 06 Jul 2001
Posts: 3056
Location: Shipsterns Bluff, Tasmania. Colorado

PostPosted: Mon Dec 23, 2013 5:34 pm    Post subject: Reply with quote

WOW , an very ambitious endeavor. I see the wingers as well on the swallow tail.

What fins & size are you looking at using ?


I would fashion a cover to /insert into the existing US BOX to fill the hole

I have refined since this , but its the top part being flush that matters, I think I made some from Home Depot paint sit sticks epoxied together.

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beaglebuddy



Joined: 10 Feb 2012
Posts: 668

PostPosted: Tue Dec 24, 2013 1:51 am    Post subject: Reply with quote

Very clever Douglas, gets me thinking....how about doing that to a displacement bow SUP? Fast on and off the plane for light wind.
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DanWeiss



Joined: 24 Jun 2008
Posts: 1928
Location: Connecticut, USA

PostPosted: Tue Dec 24, 2013 10:52 am    Post subject: Reply with quote

That Surfa 10'4" sails pretty well with just the rear fin. Not exactly an upwind machine, kinda like the original windsurfer in feel. But I sailed it bone-stock at East of Air during a big NEer and was impressed by it's speed on a reach and how it jibed, planing fully. I found the key was to use a softer sail with a fairly high draft i.e., less DH/more OH. That allowed me to put my weight on the rig by raking the rig over me -old school. Anyway, super-cool project. Follow up with your results, James!
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nw30



Joined: 21 Dec 2008
Posts: 1554
Location: The eye of the universe, Cen. Cal. coast

PostPosted: Thu Dec 26, 2013 1:44 pm    Post subject: Reply with quote

Be very careful when it comes to the final glassing. If there is any bend in the rocker line from nose to tail of the addition (any deviation between the original rocker and the new rocker, as viewed from the side) it will slow down the board dramatically. So you will have to feather out the final glassing on the bottom, so that you can't tell where the old rocker ends and the new rocker begins (no visible transition).
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d0uglass



Joined: 28 May 2004
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Location: Bonita Springs, Florida

PostPosted: Sun Jan 26, 2014 8:37 pm    Post subject: Reply with quote

http://jimbodouglass.blogspot.com/2014/01/step-tail-addition-to-sup-finished.html

It's done. It came out just like I wanted in almost all respects, except I think I did that one thing that nw30 said not to do- the rocker goes very slightly concave after the transition. So far I have only SUP'ed it in barely rideable waves and it worked well for that, but bigger waves and planing winds will be the true test.

PS- Does anyone have an extra one of either of the types of fins that are in it now that they would sell me so I can make it symmetrically finned?



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U2U2U2



Joined: 06 Jul 2001
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PostPosted: Sun Jan 26, 2014 9:45 pm    Post subject: Reply with quote

looks really great !!

nice to see thinking outside the box

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wdsurf



Joined: 22 May 1999
Posts: 211

PostPosted: Sun Jan 26, 2014 10:10 pm    Post subject: angulo surfa Reply with quote

look at the new 2014 f2 they do just what you have done to a production board Exclamation a removable tail piece that makes the more more wave biased Question
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d0uglass



Joined: 28 May 2004
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Location: Bonita Springs, Florida

PostPosted: Sun Jan 26, 2014 10:21 pm    Post subject: Re: angulo surfa Reply with quote

wdsurf wrote:
look at the new 2014 f2 they do just what you have done to a production board Exclamation a removable tail piece that makes the more more wave biased Question


Yeah, I was thinking that too. The F2 removable tail section concept could work well for switching a SUP between planing/flatwater mode and wave mode. Maybe even multiple alternative tail sections to go from wave sup to windsup to flatwater sup. I'll leave it to the experts to engineer that, though.

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