I just fabricated the same thing for our -3 the other day - used a piece of 1/8" aluminum as the primary, and a matching piece of .063 with a joggle to complete the sandwich. I used pictures from a couple of RV-3 build sites and did it by eye - after looking at the anchors ( and the drawings for them) on my RV-8. Not much science in to it, I must admit.
Paul
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Paul F. Dye
Editor at Large - KITPLANES Magazine
RV-8 - N188PD - "Valkyrie"
RV-6 (By Marriage) - N164MS - "Mikey"
RV-3B - N13PL - "Tsamsiyu"
A&P, EAA Tech Counselor/Flight Advisor
Dayton Valley Airpark (A34)
http://Ironflight.com
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