As the title says, is there any reason not to use centre fin boxes (surfinz boxes), considering the board i’m putting them in has a fair amount of vee out the back, I can get the angle I need out of centres. Will having one grub screw on the inside and one on the outside affect strength or performance?
I’ve done it for quad rears with inside foil many times without any issues, just wondering if it’s going to affect flat inside front sides.
Cheers
If you can’t get the cant/angle you want use glass-ons. Sometimes the shape, dimensions, thickness etc. of the shaped blake leave you no alternative.
Cheers ding
I can get the cant angle out of either centres or low degree sides, got to tilt the sides in to get what i want or the centres out slightly, both are the same amount of tilt, just opposite directions.
but the driving factor is - I just realised I only have 1 side box left right now! It can wait, I’ve got some coming this week but it would be nice to get it happening now!
Is a screw either side going to hold as well as both screws on the inside for a side fin??
the fin would probably flex more/move in the box. Probably not an issue if they are a snug fit.
Would be a good idea to grind a step in the other side of the tab so the screw has somthing to bite into. Its a hash ether way.
Its for this BTW… didnt put the centres in today… might wait for the sides and lam the deck first. but it was very tempting! i was stingng to glass this!
Your tail shape is very similar to a design I’m working on. Mine is a 7-6. My projects are very slow these days.
What was your logic for that shape?
The shapes a big wave quad for myself, inspired by the tomo lightning bolt guns.
the logic is basically to have an 8’0 semi gun template with 8" chopped off the back to allow the board to turn tighter. the deep cutout replaces the pintail, providing a bit more hold in the wave, but less drag. The wider tail pod should lift earlier when paddling for waves than a pintail, so hopefully no real paddle power will be lost.
Tomo’s were dual keel fin designs though, I wanted to keep mine more familiar feeling so I opted for a pretty low angle/low cant quad setup.
The other deciding factor was that my travel board bag only holds up to a 7’6!!
How’d this end up going?
good.
rode it once in small surf to test it out, and since then i’ve only surfed it once in proper big waves, out what I thought was solid (but probly not solid for locals) sized sunset. Everyone else was riding 8-9ft+ semi guns/guns that day but it wasn’t huge.
got a couple of good sized waves including probably the biggest wave i’ve ever taken off on and it felt really solid. on a couple of smaller ones I got the opportunity to turn it, and it turned well for a big board.
Haven’t had another oportunity to ride it since then unfortuntely.
Respectfully, 7’ 6’’ is not a big board, even in small Sunset. Up to, and including 15 foot (Hawaiian) Sunset, my all time favorite size surfboard was a 7’ 10’‘x 21’’ with a 7inch sq tail. Single fin. The only thing I’d change today, would be to use my close paired twin fin setup, in exactly the same board.
Bill
well its 2ft longer than my daily driver so i’d say that classifies as big for me.