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Seeking design and build feedback: pocket foil build (paulownia)

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chesapeake
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Seeking design and build feedback: pocket foil build (paulownia)

Postby chesapeake » Fri Jan 10, 2020 8:23 pm

Hi all,
I'm working out the design for a new pocket foilboard build using paulownia (https://clearwoodpaddleboards.com/why-b ... ownia-wood). I know there was an extensive thread on building w/ paulownia but I wasn't able to find any examples of laying it up the way I am thinking about. Most people seem to be strip-planking on foam cores but I am planning to cut the 1" thick boards into the longitudinal profile and laminate them together like a butcher block (see drawing). I would cut the centers out to make it as light as possible. Anyone tried this?

As for the shape, would love feedback as this is my first build. I couldn't find a lot of discussion on bottom shaping for foilboards (other than exhaustive debates on rocker). It seems like a lot of makers are going with chined rails and single or double concave in the nose to flat in the tail. I more or less took a bunch of pictures of boards I liked and traced them into vectors in Adobe Illustrator to create this mashup of shapes.

Any feedback would be appreciated!
Ride on,
Adam
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Screen Shot 2020-01-10 at 2.02.28 PM.png

tomtom
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Re: Seeking design and build feedback: pocket foil build (paulownia)

Postby tomtom » Fri Jan 10, 2020 8:27 pm

Hi,
why such radically narrowing at tail? Otherwise nice :)
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chesapeake (Fri Jan 10, 2020 8:34 pm)
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chesapeake
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Style: Strapless wave; kitefoil
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Airush Compact
Liquid Force Galaxy and Impulse foil
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Re: Seeking design and build feedback: pocket foil build (paulownia)

Postby chesapeake » Fri Jan 10, 2020 8:36 pm

Thanks! I'll consider widening the tail. More tail volume better for light wind starts?

tomtom
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Re: Seeking design and build feedback: pocket foil build (paulownia)

Postby tomtom » Fri Jan 10, 2020 8:44 pm

I dont think is relevant to talk about LW start with 106 cm board but im not sure if my feet even fit to such narrow tail :)

chesapeake
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Style: Strapless wave; kitefoil
Gear: Slingshot SSTs (7m & 9m)
Airush Compact
Liquid Force Galaxy and Impulse foil
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Re: Seeking design and build feedback: pocket foil build (paulownia)

Postby chesapeake » Fri Jan 10, 2020 9:16 pm

tomtom wrote:
Fri Jan 10, 2020 8:44 pm
I dont think is relevant to talk about LW start with 106 cm board but im not sure if my feet even fit to such narrow tail :)
Hmmm... It's about 12" wide at the center of the mast base. Seems like plenty but I'll have to pay attention to how much further back my foot goes.

grigorib
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Re: Seeking design and build feedback: pocket foil build (paulownia)

Postby grigorib » Fri Jan 10, 2020 9:23 pm

- Shaping/geometry of the bottom of 42” board is pretty much irrelevant
- I’d make it at least 11” narrow where you place feet and not much wider elsewhere
- I wouldn’t bother with emptying the core, just narrow it from 17” to 13”
- my board is layered. Layers make it nicely stiff
- consider couple of alternative attachment points for the mast 1.5” apart
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chesapeake (Fri Jan 10, 2020 9:30 pm)
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chesapeake
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Re: Seeking design and build feedback: pocket foil build (paulownia)

Postby chesapeake » Fri Jan 10, 2020 9:52 pm

grigorib wrote:
Fri Jan 10, 2020 9:23 pm

- I’d make it at least 11” narrow where you place feet and not much wider elsewhere
- I wouldn’t bother with emptying the core, just narrow it from 17” to 13”
Thanks! I based the width on typical length/width ratios I have seen in production boards. I'll have to pay more attention to how much real estate my feet are using on my next session...

grigorib
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Gear: Kites: Slingshot Rally 5/7/9/11m, SST 5m, Turbine 9m, Flysurfer Speed4 10m standard, Peter Lynn Venom II ARC 16m

Boards: Spleene RIP 37, Flysurfer Radical6 138, Flysurfer Flydoor5 XL, Slingshot/Moses 80/82/91/105cm masts with 590/330 695/425 683s/450 679/483 wingsets, Tim's 36" woody, Slingshot Dwarfcraft Micro 3'6" 2019-2020, MBS Comp 95x

For sale: Slingshot SST 6m 2018 $480, Slingshot Turbine 5m 2017 like new $450, BROkite carbon board 140x44cm like new complete $650, Slingshot Rally 6m 2017 like new $530

Moses 590/647/330 $740, Moses 633/749/483 $790, Moses 683s/749/483 $890, 75cm alu mast $200, 80cm alu mast $260
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Re: Seeking design and build feedback: pocket foil build (paulownia)

Postby grigorib » Fri Jan 10, 2020 9:54 pm

chesapeake wrote:
Fri Jan 10, 2020 9:52 pm
grigorib wrote:
Fri Jan 10, 2020 9:23 pm

- I’d make it at least 11” narrow where you place feet and not much wider elsewhere
- I wouldn’t bother with emptying the core, just narrow it from 17” to 13”
Thanks! I based the width on typical length/width ratios I have seen in production boards. I'll have to pay more attention to how much real estate my feet are using on my next session...
My current paulownia board is 36x16” and I noticed the extra width is fairly useless - my feet stand over 10.5-12” wide areas while the middle of the board where I don’t stand is wide which doesn’t make much sense and my next board will be narrower.
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chesapeake (Fri Jan 10, 2020 10:01 pm)
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bacon2109
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Re: Seeking design and build feedback: pocket foil build (paulownia)

Postby bacon2109 » Sat Jan 11, 2020 12:29 am

just an idea,
so as not to weaken the front of the board too much by hollowing it out, depending on the grain of the wood.
with 1 inch wide slats, make a type of H beam with each slat.
where you want to lose weight but keep more rigidity.
It is easier to put reinforcements in foam.
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chesapeake (Sat Jan 11, 2020 11:59 am)
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plummet
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Re: Seeking design and build feedback: pocket foil build (paulownia)

Postby plummet » Sat Jan 11, 2020 4:20 am

I have pocket wood every morning!....

That looks fantastic. I too think you should put more width in the tail. I'd go for more carbon reinforcement around foil mount and give yourself maybe 75mm of adjustment of the foil mount.
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