Years ago there was a chance of having Channels on Sways for posters and I would have constantly posted the brilliance and foolishness that I build. That would have been quite a library. I randomly find things in the garage and it takes me an hour to remember that I built it.
The modular boards are an easy build and Ive tested a few versions but there's no Red Bull Video at the moment.
So with the rear section of the surfboard already tuned by a world of shapers and with a variety from full pintail to chunky TOMO tails, I focussed only on the front section and the connector. The front section is a lateral foil that starts submerged when you're paddling but instantly planes and stays planing on a wave.
The 1st front section was very slim and designed to fit with modern board dimensions and aesthetics but due to the reduced planing area and volume it was a very slimline front section perfect for pros who have that innate understanding of control.
The 2nd was a lot chunkier, great buoyancy and front to back balance when riding but the trailing edge was so thick it created drag when paddling out. Fatal flaw.
The 3rd version is a hybrid of volume and thickness and thinner wings that sit better in the wave. It was good but still didn't feel right.
The 4th version is a hybrid but has a V notch in the middle trailing edge that allows water to flow from over and under the wings and fill in the void behind the trailing edge with little drag. It feels easy to paddle so that's a win there.
The 5th version is a slimmed down version of 4. Better foiling of the wings and refining of the connection area.
There are other versions but not worth showing.
The overall planshape of the front section took some time as the width has to suit the back section, I've gone too wide and it doesn't want to sink the nose into a turn. A rounded leading edge seems most inoffensive, tapered wings gently reduces planing area so as you turn into a wave the front sinks into the wave predictably, but the trialing edge controls how the nose exits the water through certain manouvers. A straight trailing edge pops out with instant release but a tapered training edge softens the landings as the water touches the trailing edge first. It's just a better feeling that leads to better design. I could be wrong but for me a tapered training edge is better.
There's not a lot of length between the leading and trailing edge so the rocker needs to lift but with out skipping or bogging.
Make the rocker too flat and angled high, and it constantly skips up and down esp on anything but glassy waves. Too low and angle and it doesn't lift and easily spears into the bottom of the wave on takeoff. But each version could suit a particular wave. I believe that the front rocker on a surfboard contributes considerably to overall drag but it's only when you're riding a board with nothing more than a lateral foil in front of your front foot that you feel how much that front belly affects speed.
Roll I stuck to a gentle convex.
The donor boards were
1. A reshaped 6.10 EPS board.
And 2 a 5.10 poly.
Front foils are all EPS/ epoxy for greater bouyancy.
WIP ( work in progress )
Swaylocks Surfboard Design Forum: thoughts & theories ... practical & theoretical
RAIL PROFILE http://bgboard.blogspot.com/2014/03/march-82014-afterr-seeing-recent.html
The old bridge was XPS and Carbon.
The new Bridge is laminated veneer with 4 oz.
Thanks for that Bill, I think it's a great idea, probably be like the shortboard foils I did years ago. This is something I could do as a business, get the body and foil outsourced and do the fitout myself.
I've weighed the old nose that came in at 600g
The new Bridge is 200g
and the Front Foil is 300g so I'm under the original weight of the surfboard at the moment. Reminds me of when modern quads came out and people said I'm not riding something with 4 fins, itll be too heavy. Now boards have 10 plugs and no one whinges.
How are you connecting the pieces?
Send me your dinged, damaged, and yellowed.
I'm invested a series of 6 supports into the body and foil, like a series of 6 leash plugs.
And connect through the Bridge into the supports.
The distance between the last support in the body and the first in the foil is 4 inches so the flexural component of the bridge spans only 4 inches, it's very rigid.
The supports are plastic with a 1/2 inch diameter and 2 inches long, the resin is Cabosiled so It's about 75g extra weight.
I made a jig so I can install the 6 supports all at once and in the same millimetre perfect arrangement so every board and foil and bridge are identical and interchangeable. The supports are all in line so I can slide the Foil up or down by 2 inches, so a 6'4" can also be 6'2" and 6'6".
I've tried pulling the supports out but there's no way you'd get all 6 out without a baseball bat.
Product Development 2021
Donor board 6'5" this ones big enough for me to ride and I'll get video.