After some interesting times on twinnies, (the San Diego D's and the MR kind) I started to try and compensate for lack of control or sometimes tracking, other times spinning.
The D's went double foiled and felt do-ey , then tried single foiled and they tracked cause of the long base, good for high-lines. Pavel does some good ones and has designed the Carnard Quad for this reason. Rode a good MR twin of Luke Egans, MR would have to have the design worked out. And I believe Akila Aipa's are great. I just wanted more! and to push harder in bigger waves.
Had been having a lot of success with the Sweet Pea quad( like a Carnard), so I moved the MR 78 fin up to 10 1/2 and added 2 small rear fins at 6 1/4, both single foil, ( clustered around where the twin was) with the theory of heaps of drive off the rail with the front big fin and about half the drive from behind, giving a natural squirt release and no tracking. A reversed Larry Mabile Twinzer I guess.
Noosa's Josh Gunthorp rode one before me (a 5'6 x 19 3/4 x 2 3/8) and his first wave said it all. Now Noosa is full of em. The result is The Quartet, good in ALL conditions, I surf faster, carve harder, and get way deeper. Ha! My knees are actually sore from the G's goin' thru carves. No spinning at all. After two years now of constant development, the Quartet has settled into a groove! Enough said!
Here's my alternative to the Standard 2+1 which was based on power surfing and all round surf. While Koppsy and Dane Peterson were around I shaped a super low rockered, wider outlined, semi hull inspired design. The Pink Lady set up is more Greenough inspired with a loaded flex tip. Great for middy's and wider fun boards with lower rockers. Great fun up to 4-5 ft, then the flex tip bucks you off. Less base, but more depth gives more pivot and I place these fins 1 1/2 inches further up the board to the standard 2+1. More suited to front foot surfing.
Always great to have feedback. Here's some stoked shots from W.A's Alex Fossilo on his Quartet.(Board featured earlier on blog).
Here's my general 2+1 set up. The side fins are bigger, and back fin an inch or two smaller than the Widow Maker. I originally tried two of Andrew Kidmans' Parmenter Widows bout 10 years ago, which was documented in his early 2000's movie Glass Love, one 6'4 and the other 6'6 ( filmed in perfect 4-6ft supa bank). They felt great in waves above 3ft but the back fin seemed to drag in smaller and lower quality conditions.
So after much trial and error, surfing and sanding, I came to a great balance with these fins, scaling thrusters up and single fins down, moving forward and back. Placed at 6 1/4 and 12 1/2 , I surf this 2+1 most days on the East Coast of Oz ( apart from the Quartets now) and they love ALL conditions from 1-2 ft beachies to cyclone season. Also a couple of seasons in Hawaii, with memorable sessions at Haleiwa and maxing Sunset.
They get away much faster than Thrusters, due to their forward placement but are drivier cause of the larger back fin, plus looser and smoother from the cluster. I do not condemn the Thruster set up in any way, or "truster" it has stabilized surfing and givin a great bench-mark to move on. I may go back there one day.