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Messages - finbox

Pages: [1] 2 3
1
The Shape Shack / Re: Ultralight Board Designs
« on: January 28, 2023, 06:21:21 AM »
I have used a hand vacuum test pump that is used on cars for bleeding brakes etc.. search "mityvac" harbor freight has them.  It comes with hoses & fittings that allow you the connect to the air vent - you can draw a vacuum and look at the gauge. It won't help you find the leak - but it will show that the board is not leaking.

2
The Shape Shack / Re: Ultralight Board Designs
« on: January 19, 2023, 12:47:06 PM »
I feel like this has not been brought up in this discussion. As for the foil boxes a guy in Florida had it dialed in. No extra high density foam needed. Individual carbon wrap on the boxes that tie the top & bottom lam of the board together.
The guy in Florida also used 4 oz fiberglass with Innegra to make a really tough board. Composite Envision has 2 oz innegra listed on their website, but out of stock. one layer of 4 oz glass & 2 oz innegra would make a tough and light board. or just place the innegra at the nose, tail & rails for impact resistance. How about 2 oz fiberglass & 2 oz innegra - then carefully placed carbon reinforcements as needed.
I like the idea of using different densities of foam - Kings makes boards with 1 lb or 3/4 lb foam wrapped in 6oz & 4oz fiberglass - not ultralight but shows the light foam can work.
If I remember right didn't the Florida guy offer free ding repair for the first year?

3
The Shape Shack / Re: Hollow foil board construction method
« on: December 17, 2022, 05:39:53 PM »
Here is a airplane wing construction video - I uses CNC mold & infusion with lots of bonding of parts together with a post cure oven. https://www.youtube.com/watch?v=74KQ7Rne48k Perhaps some ideas may be used from this?

4
The Shape Shack / Re: Vunderfoil
« on: December 11, 2022, 09:17:07 AM »
Hi,
Have you been able to run a Computational Fluid Dynamics (CFD) program with the proposed foil shape? If you can compare it to a know front foil - this could help validate you design prior to making it real.

5
Foil SUP / Re: Something new?
« on: November 25, 2022, 06:51:19 PM »
Hi,
I got a https://store.acpcomposites.com/rocker-300-vacuum-pump - Rocker 300 oil less vacuum pump last year - it has worked flawless. You can get it cheaper on amazon.

ACP also offers clips for the ends of vacuum tube bags , so no sticky tape needed https://store.acpcomposites.com/quick-lock-seals, also tube bags in various widths.

I purchased dry carbon from Composite Envisions- they also have prepreg https://compositeenvisions.com/product-category/composite-fabrics/pre-preg/ , they offer a variable cure rate prepreg. It indicates 6 month storage life at 40 F - so your beer refrigerator would work. They can also wet out any fabric to make it prepreg.


6
General Discussion / Re: Should this site be renamed the foil zone?
« on: November 24, 2022, 05:08:58 PM »
Where is the pickelball thread?

7
The Shape Shack / Re: Messy Fin Box Accident
« on: October 08, 2022, 06:08:16 PM »
Hi,
Without a router? How about a dremel tool? or a Mellon ball spoon- A knife and putty knife to remove the foam will work ( or flat popsicle stick end.  Remove the foam as clean as you can, then cut a foam plug with a 1/8" or less gap then gorilla glue it in place. Leave it high and tape it down so the glue won't push it out. Sand it flush. The gorilla glue will fill the gaps. Use gorilla glue to bond foam to foam - that way you don't have to worry about the heat from the epoxy curing compromising the foam.

8
General Discussion / Re: Bolts for Dolts - materials, sizes, sourcing
« on: September 02, 2022, 07:59:59 PM »
boltdepot.com for the long axis bolts- they are good that you can order what you need. McMastere has fixed sized packages only

9
I think the compression strength referred to - is the pressure ding resistance of S- glass being superior to E glass. That usually shows on the bottom of the board as how did I get that kind of damage.  I like a carbon strip on the rails over the fiberglass to keep dings to a minimum. It also feels harder when you hit it with the paddle blade.
My Hobie RAW with the innerga grid has aged well and is on the lighter side

10
Kings Paddle Sports - Dave Daum puts step deck on his boards often. He is in Carlsbad. https://www.kingspaddlesports.com/

12
The Shape Shack / Re: Foil boards breaking from bottom lam fatigue
« on: May 01, 2022, 03:00:55 PM »
Here is a photo of a prone board that was used in the surf and learning to pump. The box was leaking from the front edge. The skin had delaminated from the box, causing the leak. On further investigation the box could move up & down. So, major surgery & a fix. The divini cell was broken and just lifted out.
On boards & pumping - it seems alot of boards were broken at San O 2 years ago from pumping. One big guy seemed to go thru a board per week until the board builder got it right. I think it was wood stringers.

13
Here is a thread repair insert that is similar to a helicoil - it is a threaded insert - it requires the 6M hole to be redone to a M10 hole with threads. I doesn't need a special tool to install
https://www.mcmaster.com/thread-repair/316-stainless-steel-easy-to-install-thread-locking-inserts/

Welding on the fuse to fill the hole for the threads will mess with the heat treat on the aluminum.

14
Wingsurfing, Windfoiling, Wingfoiling, Wing SUP / Re: Mast Repair
« on: April 06, 2022, 07:59:01 AM »
Can you post photos of the damaged Mast?

15
The Shape Shack / Re: Wing Board Build 4'6" x 23" x 5.25" ~75-80L
« on: April 03, 2022, 09:26:50 AM »
Where did you get your carbon innegra fabric? I haven't seen that pattern before.

Pages: [1] 2 3

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