I did try the 9.5″ Turbo Tunnel fin on two different boards on different occasions. The first time was on a 9′2″ noserider based on the Model-T. I cannot say much about that instance, since I did not know hat board well, and did not test it with other fins, etc., other then I was a bit suprised with the stability of the board during cross stepping.

Recently I read postings elsewhere of people saying that the Turbo Tunnel fin compensated the corky feeling of some Surftech surfboards making them more stable and better to ride and, therefore I did set up an experiment with a surfboard that I knew well and that was not a nose rider, but had some length.

I had this fin for an entire day on a 9′3″ board I have used from 1999 until 2005, before moving into my current over-10′ traditional logs. I did adjust the fin position to angle the tunnel in relation to the horizontal plane in a way to cause the tail to be sucked into the water (because I wanted to check its effect on added stability). While riding the board during the day, I did further changes in fin position to fine tune the effect. I guess that now I have some empirical basis for my 2 cents on the subject.

The interesting result was that the added stablity allowed me cross step over the board at ease (it is 21.5″ wide, 13″ nose and 11″ tail and less than 3″ thick with considerable rocker) and I found the board easy to turn and to ride from its first third and to stretch a few fives (but not hang 10). It was like having a considerably bigger board. I am not sure if it lost speed since the waves were not that fast or demanding speed at that day.

Im sum, I guess one could find it worthwhile to try on different boards and then come to a conclusion. Next week end I will try this 9.5″ Turbo Tunnel fin again on a 9′6″ HP as a single fin and possibly on some of my traditional logs for the sake of experimenting it.