RE: fin for isonic 105 2006
Have you tried the stock fins with that sail yet? You should be able to gauge based on how the board feels with the two stock fins to know what you need for the 7.0.
For a 7.0, on the iSonic 105, I would be looking at a 34cm fin or maybe a 36cm. I use the stock 34cm fin with my 8.0 when it is fully powered up or overpowered. If I am having issues getting on a plane, I'll use the 40cm fin.
With my next smaller sail, I almost always use my 34cm fin. I've used it with my 40cm fin and it works, but I feel the top end max out because of the larger fin. Usually in that situation, I like to be on a bigger sail anyway.
You have a few pounds on me (65kg), but I would assume that doesn't adjust things too much.
Starboard [Gemini, F-Type 148, iSonic 105], AHD [Convert 60, GT Special 73], Windsurfer
Neil Pryde [v8 9.8], Sailworks [Retro 8.0; Hucker 6.6, 5.6, 4.8]
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