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

Bill Freeman wrote:

Typically a flutter survey involves exciting the primary surfaces to their
natural frequency on the ground and then calculating what airspeed would
match this freq.   Just a rough idea, I've never done it.

Bill

 
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