Contact   Imprint   Advertising   Guidelines

GB70 course racing board

here you can exchange your experience and datas about your home build boards


JMF
Frequent Poster
Posts: 477
Joined: Mon Sep 02, 2002 1:00 am
Kiting since: 2000
Brand Affiliation: None
Location: Teahupo'o, Tahiti

Re: GB70 course racing board

Postby JMF » Thu Mar 01, 2012 3:59 pm

gbleck wrote:I'm gonig to do the inserts and foam inlays as a seperate step so I can sand out any heigh spots. You can't sand it out after you glass it up without going into the finberglass. Every time you sand into the fiber you weeken the board. That being said the little dips and low spots will get filled with the hot coat and the primer coat and sanded out. It's what gives you that cool looking black and white brushed speckle on carbon fiber windsurfers and sups.


Not sure if I understand, but doing before layup will seal it better and will look cleaner. With my inserts I just counter sunk them flush into the AIREX core and set them in epoxy leaving a bulge remembering that the core material will suck up some of the epoxy while curing. Took my router and neatened up around the insert. Now the only weak point I have is a small 5mm hole where the screw/insert is. Doing it afterwards will leave the whole insert block at risk of separation for core unless that is you are laying up over that again?

If you worried about laying up over inserts and not being able to find them. Just make a template or depending on insert block material (?) you can magnetizing them and locate using iron fillings or use compressed air to cool general area down and you'll find them that way.

gbleck
Very Frequent Poster
Posts: 546
Joined: Mon Oct 08, 2007 4:39 am

Re: GB70 course racing board

Postby gbleck » Thu Mar 01, 2012 5:10 pm

Using 5 whole Chinook inserts. They go in as a strip. They are plastic so you can grind them down a bit at the edges if they are height. Not to much or you risk the screw over penetrating. Nice thing about windsurfers is they are thick you you can use long screw inserts and are not stuck having to use short little metal inserts.

gbleck
Very Frequent Poster
Posts: 546
Joined: Mon Oct 08, 2007 4:39 am

Re: GB70 course racing board

Postby gbleck » Tue Mar 06, 2012 3:09 am

Finished off the bottom rails. Did them with less emphasis on the paterns and more on making it smooth balanced and flowing. Turned out nice. Gave the board a nice sand with some 180 grit. Light spackle mixed with the denautred ethanol. I mixed it a little thiner than mayo. Leaving it unsanded untill I glass it. Don't want any water or oil contamination. No touching the board without gloves from now on. The finboxes are wrapped in 1/4" H80 Divinycell epoxied with 8 oz coloidal cilica and 6 oz slow resign reasurch epoxy.





gbleck
Very Frequent Poster
Posts: 546
Joined: Mon Oct 08, 2007 4:39 am

Re: GB70 course racing board

Postby gbleck » Fri Mar 09, 2012 2:22 pm

Behold fin boxes! The router jig is all set. Now I need to mark the finbox locations and carfully rout them out. The router it probly the most dangerous tool I own. Looks kind of intimidating with such a long bit.


User avatar
JandoF
Medium Poster
Posts: 104
Joined: Wed Nov 15, 2006 5:48 pm
Kiting since: 0
Brand Affiliation: None
Location: Guadalajara, Mexico
Contact:

Re: GB70 course racing board

Postby JandoF » Mon Mar 12, 2012 4:39 am

"The finboxes are wrapped in 1/4" H80 Divinycell" not sure if this is a good idea. I think your going to have accuracy problems on fins angles etc.... hope Im wrong

but next time its easier if you just insert the divinycell in to the eps core an the install the fin box

keep us posted! its great project!

cheers

gbleck
Very Frequent Poster
Posts: 546
Joined: Mon Oct 08, 2007 4:39 am

Re: GB70 course racing board

Postby gbleck » Mon Mar 12, 2012 2:46 pm

No problems with alignment with the divinycell. The sides came out parallel. The jig kept everything nice and tight with even pressure on the sides, front and back. Stay tuned for some gratuitous EPS router porn latter today.

gbleck
Very Frequent Poster
Posts: 546
Joined: Mon Oct 08, 2007 4:39 am

Re: GB70 course racing board

Postby gbleck » Mon Mar 12, 2012 6:39 pm


Fin boxes routed with a 2.5 inch cutting length double fluted 1/2 inch bit. For the jig I stapled some 1/4 inch strips of birch to Masonite at a 90 deg angle. Cut into some scratch foam to rout out the Masonite pattern. The bit wasn't quite long enough to go all the way through the board so I drilled a pilot hole through then flipped the board and routed to the edge of the cutout from the top and aligned the jig on those spots. For the side fins that wouldn't work as the top is domed out. I used a hand file to cut out the remaining bit on the tops. I'll update with the finbox install next. The boxes fit nice, tight and square.

gbleck
Very Frequent Poster
Posts: 546
Joined: Mon Oct 08, 2007 4:39 am

Re: GB70 course racing board

Postby gbleck » Tue Mar 13, 2012 1:41 am

After the slots are routed nice and tight. Fit the finboxes dry to check the aligmnet. Set them flush on the bottom then marked the deck side with a pencil. Used my band saw to cut off the top of the boxes. Consistant rail profile with a nice flat contour over the spots the side fins are at so it was easy to just set the bandsaw table to the correct angle and cut. I masked off the deck areas. Mixed the slow RR slow epoxy with the coloidal cilica filler mixed roughly 3oz epoxy and 4 oz cilica. Thin layer on the board and the boxes and slid them into place. Set them flush with the bottom of the board and checked the alligment. The center fin needed a little bit of adjustment. Used little wedges to get it line up just right. Scraped off the extra epoxy and bobs your uncle. It looks like a board now.




gbleck
Very Frequent Poster
Posts: 546
Joined: Mon Oct 08, 2007 4:39 am

Re: GB70 course racing board

Postby gbleck » Fri Mar 23, 2012 2:47 pm

Set the locations on the Chinook 5 whole strap inserts and filled the tops of the tuttle finboxes with eps and divinycell foam. Also have the vent in and the GoPro ready FCS insert in. Put a fixed leash plug in next to it to safty the GoPro and my GPS to. Why use a little adhesive disk when you can use a real leash plug?


JMF
Frequent Poster
Posts: 477
Joined: Mon Sep 02, 2002 1:00 am
Kiting since: 2000
Brand Affiliation: None
Location: Teahupo'o, Tahiti

Re: GB70 course racing board

Postby JMF » Mon Mar 26, 2012 10:36 am

Coming on nicely. Curious about your vent plug. I thought the vent plug was to allow the board to expand and contract in the heat or when traveling on a plane? You mentioned in your video something about releasing water from the bottom off the top? Care explaining in detail for the uniformed. Thanks.


Return to “Board Builders”

Who is online

Users browsing this forum: No registered users and 5 guests