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Old 3rd September 2012, 01:52 PM   #4
Roger
Dream Team - School Guru
 
Join Date: Aug 2006
Posts: 2,106
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Hi Farlo,
I've always used the unscientific formula that the fin needs to be at least 1/2 the width of the board as
a minimum.
As far as the maximum I've seen and used fins in the 70% to 80% of the board width range, but that is for the wider boards like Formula, Free Formula, Apollo, UltraSonic.
In order to control the attitude of the fin, you need more footstrap offset off centerline with the longer more powerful fins.
Put a 70 cm formula race fin on a 60-75 cm wide slalom board and you will be unable to control the fin and tailwalking all over the place.
Roger.
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