3. Additional fuel tanks
I have installed additional fuel tanks behind the spar and have
a total capacity of 110 imperial gallons. Because PFA were concerned about
lower skin adhesion to the ribs they made me put double flanges on each rib
to reduce the risk of peel forces. I had to test the torsional stiffness of
the wing by bolting it to a steel spar on the workshop wall and twisting it.

From the formula provided by PFA a Vcf (critical flutter) of 630 knots was

calculated - that will be sufficient for me.

Does anyone have this equation handy?  I've been looking for it with no
luck.

Thanks.

--
Chris
microcosman.com

Vance might. Vance?

Paul Lamar
 
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