I postulated the use of twin asymmetrical surfboard fins, in 1970, but did not pursue it. I moved quickly into removable tri fin designs, that same year, having lost interest in twin fin designs. I don’t think I saw them in use until around '74 or '75. That’s just when I became aware that some builders were playing with asymmetrical fins.
First a little history, like most, the early “production” twins, Hobie and C.C.'s “spacestix” I just wrote them off (Simmons did that already) as hype.
Not until Reno A, did I take notice.
Got my blood up and twins ruled my life for a while and absolutely no regrets!
Yeah I started experimenting back in 72 after learning about aerodynamics in class, I was already making fish kneeboards with symmetrical foils. Got a lot of questions from the locals at the Cliffs and some guys at the OB world surfing championships about the fins I designed, had to explain a lot of aerodynamic theory. By the way Bill, I have to appologize to you because back then a friend and I stripped down one of your old long boards to make a couple kneeboards. I regret that mistake now. sorry we were just some dumb kids back then.