Thin build, flexible with strength.

[airboy808]

sign me up if you need a HI test pilot

[SURFFOILS]

Thanks Airboy, if it works out I could easily add foils to the side wings and it would be a hydrofoil paipo !
Ive made hydrofoil bodyboards before...

I wonder how much it would be to post one of these to Hawaii ?

[SURFFOILS]

With the mold slowly taking shape , the next consideration is the veneer and how to orientate it to make the most of the inherent strength of the grain.
Here's a pic of the planshape and one of the veneer pieces.

I plan to vacbag layers of glass and veneer until I think its strong enough to ride, that could mean 3 layers or 10 layers ?, so I want to get the most from the veneer.

Longitudinal strength is more important for the middle section and for the outrigger fin.

But the arms between those two areas are thin and are going to need lateral veneer to add strength.

But how many layers of longitudinal and lateral layers are enough ?

The pine and ash veneers are flexible...

And Ive used the same veneer before and its bulletproof.

.

[bgreen]

Brett,


I haven't seen this bottom style of board before (though I'm sure there are 100s under the house). I'd be interested to see what it looks like from the bottom or side.

How's it ride?

Regards

Bob

[SURFFOILS]

Here's some more pics, sorry about the foam dust on it but its from 2009, dead flat rocker, 10mm XPS over 20mm EPS, epoxy, vacced, veneer hull and deck with 2 oz underneath. 10 mm thick carbon wings.

It's typically as fast as any flat paipo, stable because of the width but I wish I'd put some nose rocker in as it catches on steep tubes, but its a mighty fine ride with plenty of bouyancy.

Youre welcome to it if you're interested ?

Meanwhile the foam mold is starting to look better with its first coat of resin.

[SURFFOILS]

So with the mold taking shape, I'm looking at cutting out the veneer to get the best grain direction for strength.

The original paper plan Ive set with resin so it tougher.

I can also see the veneer thru the resined paper so I can cut it to shape.

When all the pieces are assembled I can start vac-bagging the glass and veneer over the mold.

[SURFFOILS]

Cutting the veneer.
Getting the longest piece with the best grain direction.

[bgreen]

Brett,

Thanks for the board offer. I have a new board that has only been surfed twice (on the same day) and then there is the hydrofoil under the house. I better stick with what I have.

It's a design you could remove the wings and gradually and replace them to test what they do. What difference do you think the wings make?

Bob

[SURFFOILS]

Hi Bob, have you tried the hydrofoils ? And how's the swim- mat going ?
The wings were an experiment to see how an ultra low volume rail works on a thick foam paipo.
My conclusion is that the thinner rail doesn't have any special benefits and it doesn't give the same resistance as a fuller rail.
Because the there's not a lot of physical size to the 10 mm rail there's not a lot of feedback from it, however more complex shapes deliver more variables - more performance dimensions to play with...
Ive found a 1 inch high square rail leading to domed deck suits me.

I'll add a pic to illustrate tomorrow.

[bgreen]

Brett,

Besides ordinary waves and a crook shoulder there hasn't been too much surfing. I suspect the hydrofoil may be a bit unstable for my shoulder (it was after surfing it that the shoulder problems really emerged - I didn't blame the board, fence painting would have been the real killer). I'll dismantle it and post it back or deliver it one day.

With thin rails I think it depends on what you are wanting to do - they're great to slice through a wave and just plane. In relation to turning, I can't don't have real comment. Other factors impact on this.

Photos are always good. Thanks.

Bob

[SURFFOILS]

Bob , please bring the foil back when you're next down this way, Ive got other craft I can swap it for !
Ive tried a few different rail shapes...

But I like the 1" square rail ( in the very top pic ) as it gives the greatest planing area, resistance thru turns, and places the greatest volume at the lowest part of the craft so as the speed drops off over a flat spot then the bouyancy is in the best place to give the best run.

[bgreen]

Brett,

Ok - perhaps November.

Is board 5 down the one you made me? With rail number 1 - how thick is the board overall? How long x wide is the board? If it is the same length as #5 could slightly longer and thinner work?

I believe there may be a new version of AKU shaper about to be available so Malaroo's design project may progress.

Not wanting to divert you but I was wondering about a recent drawing you did that looked like an outrigger. Something for another day.

Bob

[SURFFOILS]

Bob, yes no. 5 is the one you rode.
Rail and paipo no. 1 is a prototype for manufacture back in 2009, but the company went bust. They had a great technique of blowing exact eps cores and then glueing a plastic skin to the deck and hull.they were indestructable but the business owner wasn't. The boards 2.5 thick thru the middle but tapers to the nose. 42 X 20"
AKU would be good but I think some of my designs go beyond a solid 3-D object.
I think The Outrigger is the glass / veneer vacbag paipo I'm building for this thread,if the pic is on this thread it's the same craft.
In case The Outrigger its a different paipo, do you have a pic of what I posted please?

[bgreen]

Brett,

The ballot deserves a thread of it's own.

# 6 looks like a boogie-board; # 5 has an overall shape that I discussed with you so I probably have to select it; I'm not a great fan of the square nose. A thinner, longer boar would be my preference. Domed rail - interesting.

Bob

[SURFFOILS]

Brett,

The ballot deserves a thread of it's own.

Bob

Bob,
what's a ballot ? I'm not very educated.

[bgreen]

Think ballot box. I was going to use an Australian expression but I know Rod would ask for a translation.

Bob

[SURFFOILS]

Bob, I still don't understand.

[bgreen]

Hello Brett,

Here is the drawing: http://www.swaylocks.com/comment/477124#comment-477124

Either I'm going mad or you edited your post. I thought you asked which design I liked best and by ballot, I meant perhaps others might like to vote on which design they liked best, but in a new thread.

Bob

[SURFFOILS]

More than likely Ive edited the post and forgot what I wrote !
The outrigger one I showed on Sways is the same one I'm doing here.

Anyway, The mold is finished but I need to sand and polish it.

[SURFFOILS]

Finally got the mold shaped, polished, waxed and all the tiny things that pop up.

Heres the mold with the bottom layer of 10 oz...

And with the first veneer layer in top...

Tomorrow, hopefully I'll get enough time to wet the resin pop the whole shebang into a vacbag and pull these first layers onto the mold.
Only another 12 or so layers to go after that !