Hi Bill!

http://www.spacemodeling.org/jimz/kb-17.htm
Scroll down to the bottom for the fin templates.
There isn't a 1" reference, but I believe the balsa would be 3" wide.

Hope this helps out -

__________________
Hans "Chris" Michielssen
Old/New NAR # 19086 SR

www.oddlrockets.com
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