myiW Current Conditions and Forecasts Community Forums Buy and Sell Services
 
Hi guest · myAccount · Log in
 SearchSearch   ProfileProfile   Log in to check your private messagesLog in to check your private messages   RegisterRegister 
Tuttle Box Foil Failures

 
Post new topic   Reply to topic    iWindsurf Community Forum Index -> Windsurfing Discussion
View previous topic :: View next topic  
Author Message
outcast



Joined: 04 May 2004
Posts: 2670

PostPosted: Sat May 19, 2018 11:00 am    Post subject: Tuttle Box Foil Failures Reply with quote

Would like any info or pics on Box failures

I have a Slalom board that i plan to reinforce for foil, and am handy with carbon/glass and foam.

My understanding is that it's often the topside that fails which makes some sense.

Alternatively i could rout a new divinycell reinforced box in, but then i would have a tough time going back to slalom set up.

Ideally( and i've done it....) would CAT scan the board to see where existing reinforcement is

So...would appreciate any failure pics or ideas where to reinforce....I was thinkng of dropping some vertical stringers (old carbon batten tubes) down the sides, and reinforce top with more cloth
Back to top
View user's profile Send private message
DanWeiss



Joined: 24 Jun 2008
Posts: 2244
Location: Connecticut, USA

PostPosted: Sat May 19, 2018 5:20 pm    Post subject: Reply with quote

When I asked Tinho about the hollow AHD 98NT formula board, he admitted that he hoped that of all boards would be fine given its construction. Nope. The hull started showing cracks on the bottom surface at the box's leading edge. Box reinforcement was designed for lateral torque generated by 70cm racing fins rather than huge vertical torque from the foil.

I'd guess that grinding down through the paint etc. and laying a full wrap or two of carbon to grab and distribute the box load would work.

I wonder how scanning your cat would help in any way Wink

_________________
Support Your Sport. Join US Windsurfing!
www.USWindsurfing.org
Back to top
View user's profile Send private message
joethewindsufa



Joined: 10 Oct 2010
Posts: 1010
Location: Montréal

PostPosted: Sat May 19, 2018 5:32 pm    Post subject: Reply with quote

buddy had his Falcon LightWind re-enforced
this is what he said ...
"Box is unchanged, the structure around it has been beefed-up and the top of the box has been filled in so that the foil rests on 2 carbon columns."
Back to top
View user's profile Send private message Visit poster's website
thombiz



Joined: 25 Jun 2007
Posts: 702
Location: Corpus Christi

PostPosted: Sat May 19, 2018 7:56 pm    Post subject: Reply with quote

If it were me, I'd use a deep tuttle box and reinforce the top and the bottom of the board equally well. Plus, I'd probably go with Waterat. It comes with foam in place and you could make it extra tough by adding 2 layers of 6 oz carbon on the Waterat then 1/4 in. of corecell then 2 more layers of 6 oz. carbon. In this application you don't want the sides of the box to fail and wrapping the Waterat as described would make it especially tough. The resulting wall thickness is what counts. The plastic tuttle would require similarly thick reinforced walls.

http://shop.fiberglasssupply.com/Sailboard_Mast_Fin_Box-4_75in_Flanged_Tuttle_Fin_Bo_1.html
Back to top
View user's profile Send private message
dvCali



Joined: 23 Aug 2007
Posts: 874

PostPosted: Sun May 20, 2018 12:41 pm    Post subject: Re: Tuttle Box Foil Failures Reply with quote

I added strap inserts and reinforced the deck on a JP Slalom 130/78. The original JP is built very light with only one layer of carbon over the rear.

Main trick is to send the top enough to have the reinforcement bind well to the box. I used 4 oz S-glass, two strips of increasing width over the box (and strap inserts) and than a large one over to the inserts and back. No extra hard foam. After almost one year of use everything seems to be fine. Very Happy

I would not really bother reinforcing the bottom because, other than a collision, there is not much down pull from the foil. And glassing the bottom would require a rather elaborate finishing job ...



IMG_0683.jpg
 Description:
 Filesize:  1.51 MB
 Viewed:  2597 Time(s)

IMG_0683.jpg



IMG_0675s.jpg
 Description:
 Filesize:  156.24 KB
 Viewed:  2597 Time(s)

IMG_0675s.jpg



IMG_0667.jpg
 Description:
 Filesize:  127.52 KB
 Viewed:  2597 Time(s)

IMG_0667.jpg




Last edited by dvCali on Sun May 20, 2018 7:05 pm; edited 1 time in total
Back to top
View user's profile Send private message Visit poster's website
dllee



Joined: 03 Jul 2009
Posts: 3940
Location: East Bay

PostPosted: Sun May 20, 2018 3:33 pm    Post subject: Reply with quote

I'd double layer top and bottom and add 6 spider legs around the box.
Back to top
View user's profile Send private message
outcast



Joined: 04 May 2004
Posts: 2670

PostPosted: Sun May 20, 2018 8:19 pm    Post subject: Reply with quote

Good stuff thanks folks!
dvCali, that's close to the setup I'm gonna do....Angulo 132 abd the NP foil is in the running ..You happy with it?
Back to top
View user's profile Send private message
dvCali



Joined: 23 Aug 2007
Posts: 874

PostPosted: Mon May 21, 2018 2:18 am    Post subject: Reply with quote

outcast wrote:
Good stuff thanks folks!
dvCali, that's close to the setup I'm gonna do....Angulo 132 abd the NP foil is in the running ..You happy with it?


I built this for a friend and he is very happy with it. I used it once (!) and it would be big for me.

Only one thing: tt would be better to have more position choices for the straps. If I had to do it again, I might modify my isonic 111, I would use strips of 3 position inserts placed 90 degrees to the rail for both front and back straps.



img-r666103-1.jpg
 Description:
 Filesize:  6.7 KB
 Viewed:  2479 Time(s)

img-r666103-1.jpg


Back to top
View user's profile Send private message Visit poster's website
Display posts from previous:   
Post new topic   Reply to topic    iWindsurf Community Forum Index -> Windsurfing Discussion All times are GMT - 5 Hours
Page 1 of 1

 
Jump to:  
You cannot post new topics in this forum
You cannot reply to topics in this forum
You cannot edit your posts in this forum
You cannot delete your posts in this forum
You cannot vote in polls in this forum
You can attach files in this forum
You can download files in this forum

myiW | Weather | Community | Membership | Support | Log in
like us on facebook
© Copyright 1999-2007 WeatherFlow, Inc Contact Us Ad Marketplace

Powered by phpBB © 2001, 2005 phpBB Group