Say a single to double, both well blended and rather shallow/subtle with a slight vee in the rear third or so. Does this make sense on a shortboard, or are the double concaves and vee fighting each other? How would it change with fin configuration (thruster or twinzer)? Thanks- rg
Say a single to double, both well blended and rather shallow/subtle with > a slight vee in the rear third or so. Does this make sense on a > shortboard, or are the double concaves and vee fighting each other? How > would it change with fin configuration (thruster or twinzer)? Thanks- rg This is a good one… I love design tech talk… #1 If you add concave you create lift… #2 vee allows release… #3 double concaves help direct flow thru the rear third of the board… spliting water coming out of your single concave. #4 fins channel energy creating drive from water flowing past your fins… hence everytime you pump rail to rail your board excelarates… Now that we covered the basics. I shape a lot of shortboards and ride them to. Most all my shortboards run a basic configuration… Lets say i shape a 6’2 x 18 1/4 x 2 1/8 i weigh 165 add 15 for a wet 654 winter suite. I need a bit of lift to compensate for weight on such a shortboard. I want the board to square off the top not slide so i don’t want a lot of lift in the tail behind the side fins. I want to be able to add more drive ( punch ) without having a wide ass tail. The wider the harder to sink off the bottom and the top. Now i need to design a board that would fit me… The board would run a low rocker thru out the board. with a light single beginning just front of widepoint blending dub between my stance or say half way between WP and the front edge of my back fin. Because of foil in the bottom as the DB blends off between the back fin i add a bit of lite vee into the tail that runs between the back edge ( vee is only in the last 11" inches not the last third ) of the side fins and to flat off the tails end. So in a nut shell single to dub to vee to flat works good. That bit of vee behind the side fins allows me to contorl the little bit of release i want to sink the tail off the top pushing thru turns without the worry of spinning out or tail sliding off the top to much… Moving your fins in and out ( toe ) will make a change in the bottom release to. The more straight more drive better in beachbreak… More toe will allow the board to turn tighter but the more toe More Slow… There is much more to all this but remember a few things the more lift you create the more release you need to create in the right place??? Lite vee behind fins, soft rails, less width in your tail all allow release of water flowing off your tail… Another thing to remember the longer you go in shortboard design say to a mini gun 6’9 the less lift you need my 6’9 has a flat to lite dub concave to vee no single and very lite vee off the tail. When waves get over head who needs lift?? I hope that answers your question… I’m sure that some may not agree but i have a feel on what works i think??? Good luck http://surfnwsc.com
Say a single to double, both well blended and rather shallow/subtle with > a slight vee in the rear third or so. Does this make sense on a > shortboard, or are the double concaves and vee fighting each other? How > would it change with fin configuration (thruster or twinzer)? Thanks- rg About ten years ago there was a renewed interest in Bonzer bottoms. I ended up shaping my own version which ended up being a 7’0" hybrid. What I did with this board was to shape it with a basic flat to panel vee. Then laid out penciled out lines for two double barreled type concaves that ran the length of the vee, which was the last third of the board. The concaves ended up a lot deeper than I had planned, about 3/16" deep. It looked like a 70’s type Bonzer, though maybe not as deep, with a thruster fin setup. Looking at it now it looks rather crude, it was like one of my earlier shapes, but it has been one of the best boards Ive ever ridden. I’ve let others use this board, and all have liked it. Its fast, loose and positive. Id say vees and concaves do work well together.
Well said Rob, I get it. Always look forward to your post…
About ten years ago there was a renewed interest in Bonzer bottoms. I > ended up shaping my own version which ended up being a 7’0" hybrid. > What I did with this board was to shape it with a basic flat to panel vee. > Then laid out penciled out lines for two double barreled type concaves > that ran the length of the vee, which was the last third of the board. The > concaves ended up a lot deeper than I had planned, about 3/16" deep. > It looked like a 70’s type Bonzer, though maybe not as deep, with a > thruster fin setup. Looking at it now it looks rather crude, it was like > one of my earlier shapes, but it has been one of the best boards Ive ever > ridden. I’ve let others use this board, and all have liked it. Its fast, > loose and positive. Id say vees and concaves do work well together. I gotta a 6’8"x20" five fin “Bonzer” swallowtail shaped by Malcolm Campbell wanna buy it? Got too many boards in the lanaii and in the factory. Wife keeps pinging on me, I’ll let it go cheap, really. 808 254-8392 Underground Surfboard Company…
I gotta a 6’8"x20" five fin “Bonzer” swallowtail > shaped by Malcolm Campbell wanna buy it? Got too many boards in the lanaii > and in the factory. Wife keeps pinging on me, I’ll let it go cheap, > really. 808 254-8392 Underground Surfboard Company… Ok real specs on the Bonzer… 6’7" 11 1/2" x 20 x 14 1/2 x 2 5/8 x $150.00 light/variable winds again tomorrow medium tide North Beach could be good!
Ok real specs on the Bonzer… 6’7" 11 1/2" x 20 x 14 1/2 x 2 > 5/8 x $150.00 light/variable winds again tomorrow medium tide North Beach > could be good! Sounds like a good deal. Let me think about it…How does it ride by the way? FD
Sounds like a good deal. Let me think about it…How does it ride by the > way?>>> FD Underground if foamdust doesn’t want it, I am interested. I will be coming over to the islands end of Feb. Haven’t decided about bringing over my own boards yet or not. Hearing some horror stories about what airlines are charging for boards these days. I will call you end of the month and see if the board is still available. Thanks ed
The Board rode well, I had it made in 97’ just before moving to Japan. I haven’t ridden it in awhile I go a little thicker or wider on my personal boards these days. If it were up to me I’d keep it around for references and cause I really dig surfboards. It’s watertight and the deck is not very dented. But my wife gives me stink eye everytime I bring home a new blank (unless I can hand over a customer deposit check) so I gotta unload some of the stuff that’s just sittin around.
The Board rode well, I had it made in 97’ just before moving to Japan. I > haven’t ridden it in awhile I go a little thicker or wider on my personal > boards these days. If it were up to me I’d keep it around for references > and cause I really dig surfboards. It’s watertight and the deck is not > very dented. But my wife gives me stink eye everytime I bring home a new > blank (unless I can hand over a customer deposit check) so I gotta unload > some of the stuff that’s just sittin around. UG, If ed wants to buy the board, by all means sell it to him. As much as I’d like to own an original Bonzer, I just dont have the extra cash. Hope the deal with him turns out ok. What I really need to do is get off my butt and finish a 7’0" egg thats been sitting in my shaping room since August. Aloha, FD