Tim,

I would guess that that fin is pretty much spot on if not a little too big for those conditions. I have used a 32cm fin with a 7m before and whilst that is a little small I don't think the fin is your problem. Try shifting your harness lines backwards an inch. This may take pressure off your back hand and lessen the tendency for spin out. The other thing to note is that you should run off the wind a bit to built up speed and then load the fin up. The amount of force your fin can suppport grows significantly as speed increases. I think it is proportional to the square of your speed.

Hope this helps.

Whoah, 9cm chord width on a 41cm fin is very narrow- it is narrow even for a 35cm fin. To counter this you will have to have a fair bit of speed before you move into the straps so point off the wind a fair way to get going (make sure when you start moving point upwind until you get a gust THEN bare away). You will have to be kinda subtle moving your feet into the straps, if you use booties consider not using them. Also you can move the straps forward a bit this takes some of the pressure off the fin.

Play around with your harness lines see the closing the slot post for the URL for correct harness line positioning. It is sometimes not a case of moving them back, you can have them too far back.

Other than that board, sail and fin are perfect size- you just have to make some adjustments and get used to them. Dont let the spin out at slow speed deter you once the fin locks in it should be good.

***also ensure fin has no nicks/dents/flat spots, fits the box properly/is flush with hull and screws done up tight (this is probably all fine but checking just in case).

I dunno if the www.finco.com.au site is still going but it has a good explaination of spinout.

It and other authorities point out that by far and away the most common cause of spinout is incorrect sail tuning.

Try more downhaul.

Best winds
Tony L

One thing that helped me with spinout was remembering to keep the leeward rail planted when going for the straps. In other words, don't worry about the 5 seconds you're going downwind while you're going for the straps. Plenty of time to worry about getting back upwind when you're leant out and planing.

Also if you jam your back foot into the rear strap quickly then that's a guaranteed way to spinout. Maybe it overloads the fin, I do know that if I miss the strap and hit it with my foot (instead of sliiiding it in) then I'll spinout every time.

mkseven knows what he's talking about