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Increased rudder calculation

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4trade

Well-Known Member
Joined
Nov 1, 2010
Messages
595
Location
Lahti/Finland
Hello everybody!

I am building Cassutt 3M, and i want increase rudder area, because i plan to fly mostly aerobatics. Raising rudder/ fin for 2 inches is common way to add area for Cassutt pilots that use their plane for aerobatics, but i want to add little more area just for looks.... Our Finnish aviation officials need some kind of proof that modifying rudder is safe and tailpost/ frame will can take that bigger load. If i calculate new load for this bigger rudder and hang that load weight at tailpost/ hinges , i can build it. I will add third hinge and aerodynamic boost for it. New rudder area will be approx 30% bigger than original and deflection angle is 20 degrees. Original rudder area is 2.6 sq/ feet.

I tape new lines that look good (for me) at original tail. My plane and tail pictures are here; CASSUTT RACER OWNERS FORUM • View topic - Finnish Cassutt

My humble question is how i can calculate this new rudder? How can i find force that affect my hinge/ tailpost? I got only basic mathematical skills....so is there some relative easy way to calculate it?

Cheers
--Vesa--
 
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