Converting a channel twin into a single fin.

Hey Jo. I'm assuming the fins in your board are a removable fin system such as futures. If you are using regular upright twin template fins, try swapping them out for a modern keel type fin. Their swept back template and base sits further toward the tail and give the board a lot more hold. Worth trying before exploring other options.

Good advice Tiger- Jo this may explain a bit

Even in the video in your link, Johannes, the surfers look competent and the waves good but the board looks to be holding them back through all the turns.
And that’s them promoting the board.
I’d say it’s probably just a bit of a dog, unfortunately.

I'd somewhat agree with the above, Jo. That surfing isn't a great advertisement for the board.

If you're gonna pursue some sort of action, I'd consider routing in a single fin box and riding it as a 2+1. The board will lose a few yards of pace but you'll gain a greater range of turns, and also find it's a bit more stable too.

That said, I'd probably look to offload it and try something new.

Jo you may find this informative
https://www.swellnet.com/news/swellnet-dispatch/2021/10/14/the-mid-lengt...

Personally I’m not sure the boards the problem , in the video anyway.
The guy surfing is riding fairly forward and kinda looks like someone who’s used to riding shorter boards.
You know, popping up with the same amount of board in front that they’re used to.
Looked like he just needed to move back a bit and feel his wax in.

I’ve been listening to a podcast lately called Salt of the Peninsula about surfing legends of the Mornington Peninsula. Anyway at least two episodes are on very well known shapers past and present of twin fins and I remember one talking about the false need of a trailing fin; something along the lines of if you keep a rail buried you must have a fin holding. It sounds good and makes sense but it’s kinda beyond my comprehension.

If it's in good condition its sounds like you just need to move the board on rather than mess with it which highly likely wont improve things they way you want.

Agree that video was not a great advertisement for the board either.

Convert the board to a 2+1, larger fin in the rear. It will turn predictably and be able to have turns pushed, cut back with hold and precision and be able to do this small through to powerful, larger waves.

The long rails of this type of shape will provide the speed down the line without the need to pump or skate fins.

3 1/2" gap between the rear of the stabilisers and front of the rear fin and adjust from there to your preference.

velocityjohnno wrote:

3 1/2" gap between the rear of the stabilisers and front of the rear fin and adjust from there to your preference.

I only go about 1 inch back.
If it’s weak and junky I sometimes cluster it right up and the middle starts where the sides end.

Maybe see if you can borrow some keels first, before you do anything.
It can make a heap of difference in terms of drive and hold. I use both of these in similar style boards to yours, the upright keels are looser and sit somewhere between the traditional keels and those MR style twins.
https://needessentials.com/products/keel-fins
https://needessentials.com/products/torren-martyn-hand-foiled-raked-keel...

If they are no good probs sell it on and get something you like more. Good luck.

If you're going to set it up as a regular 3 fin set up, it will be best to have the rear no closer than 3" from the tail. If you go for a fin box to accommodate a larger centre fin probably around the same. Depending on the thickness of the foil in the tail, a fin box may not fit that far back.