Kinda interesting template and design.
Pulled from instagram by @takedacustoms
And this is what he says about the fin
the rectangle slot running down the foil of the trailing edge is to reduce foil stall or what some wrongly call cavitation. It’s when the big old fin doesn’t settle into the water correctly at high speed, what happens is this horrible sense that the board is slightly off line and sliding but your still moving fast but can not turn over on rail. Sux on a 25’ wave!!!
Got 59 likes. That design must really work. ;^}
I don’t get it …
is it just me , or is having a fin on the deck , perhaps , er , a bit unneccesary ?
[maybe it comes into its own , when doing ‘eskimo rolls’… or maybe it’s for castrations ?
Hey Ben I think he just set the blue fin on there for the pic cuz the laminations help show the foiling. The slot looks interesting but wonder why he calls the leading edge a trailing edge? Anyway. The science is lost on me, but my sense of curiosity wants to give it a try!
al byrne and the windsurfers have been doing slot fins for years , as has erle pedersen [sorry to sound like bill]
Warrior,
The blue slot fin looks beautifully foiled. Are you making these for people riding single fins? The fin you made me works great and it’s the only fin I’ve been using the last month. Small dribblers to a couple feet over head grinders. Love it. mike
rooster,
Glad that fin is working for you. I greatly appreciate the ride report and I hope Bill reads your comments too.
Dave
I used a slotted windsurfer fin in my longboard for a while. Worked ok felt smaller than it was needed a bit of juice. I’ve since cut the slotted bit off and glassed it onto a little egg where it works much better.
Okay I’m just gonna point out the elephant in the room since people are giving ride reviews on slotted fins by just saying “it’s good”
Why? What the hell does a slot in the fin do? I would lthink it would create drag or cavatation along the face of the fin as fast-moving water flows over the gap and creates a bubble inside of it - I thought bubbles from fins = bad? This reminds me of the “Turbo Tunnel” fins - seems like all marketing and zero funcional difference from a traditional fin in the form of noticable performance gains.
But that’s just cause I’ve never ridden one, so it’s hard to wrap my head around the concept having never tried it… so that said, what’s the purpose/concept behind the slot, how it’s foiled and what you’re gaining?
I have actually had surf lessons where they ask me which way the fin goes… or worse they start climbing onto the upside-down board and paddling it… as if there isn’t clearly a top and bottom that any idiot could notice
The concept is sound. The execution, in this case, is not. Though, I must say, it’s better than most.
But that’s just my question - what exactly is the concept?
I’m not being pessemistic or doubtful - I’m just trying to understand what effect is being achieved by this? I genuinely do not know what the intention of the slot is
Sorry if this is already explained in another thread
here’s some discussion of slotted fins from an older windsurfing web page…
http://forums.boards.mpora.com/showthread.php/33655-slotted-fin
Reduce the area more like this from base to tip and it will stay settled and it control . As well as having an unlimited top end .
different but same?
aimed to increase stall angle, in the same manner as slots and tabs (and canards) on aircraft wings.
Spot on! Perfect answer.
