For Lars : to be as accurate as possible for fin size recommendation/s needs some (even aprox) reference to rider weight, especially when considering highly "geared" or leveraged setups like iS at max performance. Assuming "typical" sport rider weight around 80 kg and good experience /race tuning etc, then TR-3 7.6m with SL2 38 would be dream, but a little on the large size for TR-3 7.0m unless underpowered 7.0m.
Think more in the range SL2 36cm or even 34cm if fully/over powered on 7.0m.
Tectonics Goldwing : A classic slalom fin if ever one existed, but not so ideal in new school short wide slaloms in "larger" slalom sizes. Goldwings (with a fine and narrow tip) also tend to (performance) size a little smaller than some other more powerful fins of the same mechanical (measured) size. I'm not sure what the absolute biggest GoldWing size is, but I wouldn't think much above 34cm as being all that effective. If you are thinking Tectonics in the 36+ size range for iS a more suitable model is their F8 Tomcat, but even that (as with most G10 based fins) starts to become a little soft for super hard (hi powered ) sailing on sizes above 42-44cm (where the structural properties of molded carbon fin starts to take over as a better design option to G10 which is reaching the limit of its strength [flex/twist] to thickness ratio).
For Ken - I wasn't ripping into your jibe technique, rather just drilling down into the factors that could be contributing to (what seemed like) a rather unusual scenario from your side. Certainly not what most guys would consider "spinout" in a typical sense. But wet is wet, and looking to avoid that, while not deflecting blame away from the fin, the specialised nature of getting the best from "wide tailed" slalom boards definitely benefits from a slight modification or tweak in technique away from the more conventional freeride carve jibe (which many have an advanced technique on, but sometimes find anomoly when they overlay that directly onto boards like HS/iS and similar wide tail/vertical fast foiled fin boards sailed with hi power to size ratio). Losing the fin/board to the INside of the turn mid jibe is certainly an unusual one, and almost certainly caused by major disturbance over the flow on the fin, which in most (not all) cases would be a setup/entry issue, which of course only shows itself when you weight into the turn to find the fin lift has gone.. I would definitely look at the way you are setting up your entry/rig depower, and also maybe moderately accentuate a rear bias in the jibe rather than setting up to carve forward along the fuller waterline length as you would on a more traditional or freeride design.
Other than obvious fin issues, check the fin is firm in the box and/or no structural issue between the actual blade and basing material..
Cheers ~ Ian
Last edited by Ian Fox; 7th February 2008 at 05:26 PM.
Reason: Amended "Falcon" to intended "Tomcat"