another fish question

Can anyone articulate the differences in the way two retro fish boards of the same size (5’10) will ride if one is a keel fin and the other is a twinzer set up? I’d also appreciate if you could address the way they would differ, if at all, in being ridden backside.

or so i have heard

A twinser will resist spinout better than a keel but a keel will hold a truer line (more drive) through a turn. The twinser is generally looser as well.

If you like traditional surfboards and enjoy the feeling of the original deal go with the keel fins. They are more for people who have an appreciation of the finer points of surfing, the feeling of just gliding in the curl and not feeling the need to crush the lip 4 times. The modern thruster/twinzer version of the fish is basically a wide modern shortboard and will perform as such.

I made a wierd hybrid board that is sort of a comprimise between a keel fin and a twinzer. I put the small leading fin ALL THE WAY INFRONT of and to the side of the big fin. I was hoping to keep the long outline of the keel for drive and have some leading edge turbulence for looseness like a twinzer. Did it work? I actulaly think so, but the board itself is a little wierd…6’4" 3.25 thick, 21.5 wide deep belly in the nose and slight concave through the tail with polystyrene and epoxy. I’ve ridden it with good success in over head to dbl head very fast, some what unforgiving hollow waves…Taking off just inside the long boards (who were having trouble getting to the bottom) and way outside the groveling slop rats (dropping in and straightening out), making sections at will and even occaisionally hitting the lip. I really like the board, but wish it was looser…but all that drive…there was this one wave, I swear…