Thanks very much gentlemen.
Silentbutdeadly the tubercules on the leading edge of the fin can increase efficiency by increasing lift, reducing drag and increasing the angle of attack capability. I liked them so much on the 10-6 Earl that I thought I might as well apply them to the Dragon. Although the big board doesn't often operate at high angles of attack on the fin, it does have moments when the fin is under a fair bit of pressure. So maybe it isn't necessary here but the feeling is so nice, the fin feels more powerful and accurate to me. Plus of course it is a visual feature ( I didn't really say that
Also my idea is that by gaining in AOA capability via tubercules I can reduce the thickness of the fin without losing any AOA capability, while reducing form drag slightly. Likewise an increase in lift due to tubercules should enable a slightly smaller fin to be used without losing lift, while reducing wetted surface drag slightly ( or at least making up for the slight increase in wetted surface area which the tubercules entail. In other words if there's an efficiency gain it can be spent where we want it, and tailored just so.
Party Boy you are right, the fin is a few inches further forward, there's no reason for this apart from the whim of my eyeball when I installed it. I think I like it a tad further back but no doubt it will do the job where it is.The wide angle taken from the tail accentuates the slightly forward position, it looks more like it really is in the upper photo below.
Warren the board took around ten months to make, it's been a busy year and a tough winter so it was a bit slower than usual. Having said that the original made in the year 2000 took eight months, but that was in a wrecked bus with no electricity. The round nosed short board needs a new fin, which is coming up, you mean the one with a squaretail and tunnel or the twin fin?
By the way I was stoked to get a compliment from John Mellor on this one, he added that the Dragon reminded him of some Chumash Indian rock art he has been admiring in his archaeological travels.
Here's a look at the rocker: