Do I put the small fins in the front and the bigger ones in the back?
Or do the big ones go in the front and the small ones in the back?
I guess it’s prefence really, but what is the standard?
fyi. I searched the old forums etc and found nothing on this…
Thanks
Matt
Matt:
My understanding of the Twinzer design suggests that the small leading fin should be placed forward. It functions as a vane, which I believe means that it ‘prepares’ the water flow to interact more efficiently with the primary fin.
I think that if you place a smaller trailer aft of the main fin, you’ve created a variation on the quad theme which represents a different hydrodynamic approach.
Another variable to consider in the twinzer arena involves toe in of the small leader fin (or vane) I have ridden boards with the vane parallel to the primary and boards with the vane toed in more. In my opinion, parallel works better–at least in terms of stability. The more toed in vane mad the board super duper loose–even looser than when ridden as a twin or twin keel (I had a fin system to play with here).
If you want the twinzer experience, I would suggest small fin forward, overlapping the vane by about 1/4 inch in terms of forward placement, about 1 1/4 outside of the main fin, and toed in parallel to the main fin. This opinion is based on my own experiments and a board built by John Mel, who is a badass.
Experts–feel free to correct any misapprehension on my part, but I think this is right.
hunter
On my Larry Mabile Twinzer Fish the small fin is forward, I’ll get full measurements tonight if I think of it.
IMHO an important point of the twinzer setup is that the small front fin is canted more. This brings in just the correct amount of lift to loosen the board, while the trailing fin has less cant and more area therefore produces more drive/projection. So the front fin loosens the board and the rear fin produces drive.
This combination with the deep concaves for control of water release gives the loose but drivey properties of the twinzer.
The toe-in needs to be tuned for the particular waves/rider.
I could be dead wrong though.
…all kinds of experiments welcomed ! [these are only two , on my p.o.s. ‘prawn’ and ‘bushfire’ boards…]
[yes , the back fins “could” be moved forward one plug ! haven’t tried THAT setup yet , though…]
I’m buiding a 5.9*21 twinzer and my settings are:
Back fin 5*5 at 7 1/2 from tail.
Front fin 3*3, 3/8 overlap with back fin, 1 1/4 from rail
1 1/4 between front and back fin.
Cant 4°, toe-in 5° for all fins.
More toe-in for the lead fins may be a better option…
I have found several measurements on sways:
back fin at 8.5, cant 3°, front fin 3/8 overlap, cant 5° (Shipman, from a KG twinzer)
back fin at 7.5, cant 4°, 3/8 overlap (Herb)
back fin at 8 5/8, 3/8 overlap, 1 3/8 between main and lead fins (Blakestah from a 7.0 Wil Jobson)
On my twinzer I will set several fcs boxes to play a bit with different fin configurations (a Chip’s inspired project…)
burnie measurements from your LM twinzer would be really great…
Ask and you shall receive…
Its a 6’8" Fish I bought 2nd hand, I’m not sure what it was designed for
My guess is bigger waves with the straight toe in and belly right through
It 2 3/4" Thick with a 16" tail and about 21" wide
It has belly all through with Spiral V
1/4 v in tail and about 3/16 concaves at tail
Concaves start at 1/3 from tail
Front Fin
Leading Edge 16 7/8" from tail
2" from Rail
Toe 2" off Nose
Cant 13 - 14 degrees
Base 3 1/4"
Height 3 1/4"
Rear Fin
Leading Edge 14" from tail
2 3/4" from Rail
Toe 3 5/8" off Nose
Cant 3 - 4 degrees
Base 4 3/4"
Height 5"
Can any twin fin be turned into a twinzer, or do all the fins have to be set up together??. There are so many possibilities in surfboards my head hurts!
Chip,
Check your PM’s. Message there.
yes , thanks Bill … got it !
those front fins are no longer here [I sent 'em to the superbank!] , but I’ll keep your suggestion in mind , and try it with the next thin side fins I make …actually , maybe I can do that with my resin swirl canards , come to think of it ?!
cheers
ben
i would also like to know this, thanks!
SInce my last post,i,have added “vanes” to 3 different boards, with positive results. Next board I will set it up from the start. Search “supercharger”, you’ll find what you need. The 3rd board,i,recently put plugs in, but they were cheap junk, and the screws are shit, so I havent tried it yet, but the other 2 worked unreal. The keel fin in my avatar is my all time fave board. Fast n loose!!!