Hi guys.
I uploaded this post last night complete with photos, but when I went back to see if there were any replies it had dissapeared… I hope it wasn’t because it was kite-surfboard related and not strictly a surfboard post??
Anyway, I’m building a 5’-4" all Core-Cell kite surfboard based on a high performance short board outline
I’m also making some composite Carbon, Carbon/Kevlar, S-glass Core-cell fins that are copies of FCS H2 Medium and Large, which I will glass on the board due to the fact the board is only 1" thick max. I’ve made some exact scale templates ot the medium and large H2’s, what I need to know is ; Does anyone know the thickness of the foil at its wide point for these fins, and where, percentage wise in relation to chord,is the thickest part of the foil located?? I was thinking around 30% behind the leading edge…
Thanks in advance… A.P.
P.S. Surfers, kite-surfers, we’re all brothers ,carving up blue water and having a blast!!
If you guys are interested in composite construction, kitboards, vac bagging and contributing your weath of knowledge of surfboard building, come join us at:http://groups.yahoo.com/group/boardbuilding/
Alan,
30% should do fine. I’d go 1/2" thick at the base, tapering to 3/16" at the tip. I’m assuming a symmetrical foil.
know anyone with a pair of h2’s or you could bring a pair of calipers to a surfshop and ask to see the h2 and take some measurements. I for one would love to kiteboard, i can’t think of anything besides maybe a hobie cat on those summer days when we have 10-15 mph winds out of the south that would be more fun. some other kiteboarders post here or have so i doubt that was why you post got buried.
Thanks Bill!
I was thinking around 3/8" thick at the base due to the fairly high speeds kiteboards travel at, with drag reduction a real plus.
So I think I’ll split the difference and go 7/16"
Thanks again…
A.P.
Unfortunately, no surf shops nearby. I photo shopped a picture of the H2 fin then kept adjusting the size until it perfectly matched the manufacturers specs.
You should definitely try kitesurfing, they’re real fun to build too!!
A.P.
unfortunatly my funds arer tied up in expanding my surfboard quiver, getting a car so i can go surfing on weekends with waves and also traveling the fall after my senior year of highschool, All you spainards I am headed you way fall 2007!
That is a very high cant fin, so it’s not going to be very drivy.
Here’s a quote from a professional full-time fin maker about foiling single fins.
“We find that placing the max camber between 25 and 30%, and rounding the front edge, is a good neutral high performance foil, and all out fins come foiled like this unless specified otherwise”.
If you make one side flat, it applies to rail fins, too.
I think the H2s are a bit thicker than standard fins, too.
I make my rail fins with max camber at 20% for maximal lift-i-ness, the difference is somewhat subtle, but noticeable. But I would move the max camber back to 30 or even 35% if I was running it at a 10+ degree cant!
Thanks for the info!
Using my protractor /square , I was only going to set my router up to cut me a 5 deg. cant slot in the core-cell… Because these fins will be home made and straight, as well as glassed on, the slot in my foam core will dictate the cant angle… I’d read the H2’s were set at 10deg or so , that seemed like way too much for my application. I was planning on having a full foil on all three fins, not flats on the 2 sides, does that sound ok…??
Planning on little to no toe-in as well… any comments welcome.
Thanks again!
A.P.
