Reverb , you said what I did not want to , I was not impressed with anything on that video .
M Ding , if you look at the video that I refered to you can see the board clearly and I do not agree that it is the same as a Stewart hydro hull at all , this design is much more radical and the edge very defined .
"This video was made with the first edge board that Marc Andreini made, since then the boards have gone through a number of refinements and have evolved."
Looks fast and uncontrolled. Trading control from the rails for speed.
So... balance that out with something else, right?
Thing is, it's just a PITA to make. If only there was a way to make hard edges easier? You could instead just try to design according to the hardest edge you can get with a vaccum and not need to do a lot of grinding down the resin.
I wasn’t as clear as I should have been. I’m not making any comments about any other rail. Just pointing out to Reverb the association between Stewart and his use of the Hydro rail.
In either late 1965 or early 1966, a fellow shaper at Hansen, Bill Clark, made a personal board with a full length concave deck, and ''chine rails'' on the bottom. Essentially what is now hailed as an edge board today. Mr. Clark had/has considerable experience as a boat builder. In the early 2000's, building a personal day sailer for Dennis Conner, the America's Cup skipper/winner. There are many new things under the sun, but the edge board design, is not one of them.
Walden has been doing a concave bottom with 3" wide hard chine for many years, although they didn't taper the chine or bring the edge to a crease.
Mr Gene Cooper (to me) has been doing his speedhull bottoms for several years
I’ve been riding my rendering of Gene’s C2. 11’6 and the thing is a DREAM. Had it out 2-3 times in head high + waves and it flies! Holds a beautiful line and I can turn it with ease.
I believe my concave through the fin area is a little mellower than Gene’s (only based on photos I’ve seen)
"We ain't on our way to Wembley,we ain't gonna win the league. No matter how much they let us down - Westham's still our team"...
Yeah, Yeah, Yeah. All common knowledge. But the OP would do well to take my advice.
The evil opposite of the edge board. The 'anti-edge'....
Just found this interview w/ Rasta from couple years ago. Cued it up where he's talking about riding edgeboards and how difficult they are to ride