Author Topic: Ultralight Board Designs  (Read 24859 times)

Beasho

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Re: Ultralight Board Designs
« Reply #90 on: April 07, 2023, 12:06:01 PM »
Results look like this:

Estimated additional 4.6 oz.  Actual add 5.4 oz. 

This difference might have been from thirsty foam, especially around divinycell which readily sucks up resin.

Super clean and crispy.  No dry spots. 
« Last Edit: April 07, 2023, 12:23:22 PM by Beasho »

Beasho

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Re: Ultralight Board Designs
« Reply #91 on: April 07, 2023, 12:16:49 PM »
Here is the current build schedule.

When accurately weighing the fiber, and resin then vacuum bagging with

1) Peel Ply
2) Perforated Release
3) Breather layer
4) Full 20 in HG++ (You can only do this with XPS foam rated at 15 psi or higher)

The resulting weight of each additional lamination is nearly exact to what you would predict with a 60% Fiber to 40% Resin ratio.  Meaning there is no guessing what the final board will weigh.  It turns out to be just a math exercise.
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« Last Edit: April 07, 2023, 12:32:18 PM by Beasho »

Dontsink

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Re: Ultralight Board Designs
« Reply #92 on: April 07, 2023, 01:39:36 PM »
Next Board is being built.


6' 9" x 26" x 5" @ 119 liters.  Target weight 9 lbs 12 oz.

XPS Core:  Top 1" is 1.8 lbs per cubic foot.  The pink 2" x 2 slabs is Home Depot Foamular @ 1.5 lbs per cubic foot. 

My Sailfish has 40 sessions now.  There are some dents on the deck that are parrallel to eachother (?).  Meaning square stance, but I never stand square - KNEE dents.

Having fallen of the board at least 20+ times per session I estimate 800 remounts, kneeling and standing on the board.  That's a lot of knees. 

My rail on the left side is also showing constant wear.  I suspect this was from climbing on Over-and-Over.  The edge was NOT rounded enough.  I liked the square edge for control, but BAD, BAD, BAD for wear resistance.  Going to go for 1" Diameter on this new board. 

Also - I am going to use 2.2 oz Kevlar INSTEAD of 1.4 oz Glass on the bulk of the Nose and Tail.  Much better wear resistance at a similar weight.

PS: I hot wired the rails with a $38 Amazon hot-wire kit.  Worked great for rails.  I needed some help from our local 'shape-shack' to hot wire the nose rocker with a 30" wide wire and template.

On the second pic, what are you using as a guide for the hotwire?.
Is it a braided steel wire or solid metal rod...?
Thx!.

Beasho

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Re: Ultralight Board Designs
« Reply #93 on: April 07, 2023, 04:43:53 PM »
On the second pic, what are you using as a guide for the hotwire?.
Is it a braided steel wire or solid metal rod...?
Thx!.

A Piece of solid piano wire ~ 3/32" thick that I soldered metal tabs onto.  Then I contoured the angle and TAPED in place.  The tape didn't want to stick very well, so I tripled it up.   

I used an aluminum ruler for the other side of the guide, on the flat edge of the board.

Beasho

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Re: Ultralight Board Designs
« Reply #94 on: April 09, 2023, 10:33:56 AM »
Homemade Sailfish vs Barracuda.  Taking off on the same wave.

Josh on the Barracuda (7' 10" x 19" x 115 liters @ 13.5 lbs), Kyle on the Sailfish 7' 9" x 21" x 128 liters @ 10.1 lbs):

https://www.youtube.com/watch?v=dN4f3WCNZ9o
« Last Edit: April 09, 2023, 10:35:55 AM by Beasho »

Hdip

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Re: Ultralight Board Designs
« Reply #95 on: April 09, 2023, 02:53:05 PM »
What foils are they on and what are their body weights?

Beasho

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Re: Ultralight Board Designs
« Reply #96 on: April 10, 2023, 10:08:22 AM »
What foils are they on and what are their body weights?

  • Josh - Barracuda - Axis 1300 - Tail 375P - Weight 185
  • Kyle -   Sailfish   - Axis 1300 - Tail 450P - Weight 175

Hdip

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Re: Ultralight Board Designs
« Reply #97 on: April 10, 2023, 10:21:16 AM »
Nice. That's a good comparison.

jondrums

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Re: Ultralight Board Designs
« Reply #98 on: April 10, 2023, 04:56:27 PM »
sorry to geek out one step too far, but I guess that's why we're all here anyway, right?

What fuse lengths are they on?

 


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