Sunday, August 30, 2015

Chapter 20 Step 7 08/30/2015

Rudder hinges going on after layups cured.



The hidden rudder bell horn results in odd placement of the attachment holes on the bottom hinge.   Click Bonds were ordered and will be used to eliminate the exposed screw heads like you might be able to see on the ailerons.

Also, where the extra lay ups are to reinforce the hinges are, should have been clamped down similar to how the hard points are done in the center spar.   This would provide a flatter mounting surface for the hinges.

And... the -6 hinge has to be trimmed to fit as its to wide.   Alternatives may be do take out more foam or order the -5 hinge instead.   

And the last tidbit is, don't leave the hinge pin in if you're cutting the hinges with a band saw.   The blade will spin the pin and it will remove the annealing.   The pins may either be stainless steel or hard carbon steel and react with aluminum if not coated.   Somewhere a Lancair builder has posted information about issues he's had with aileron hinges wearing and one thing he's found is to use a larger rods.    Teflon tubing that can be inserted over the hinge pin to eliminate a little play and also to eliminate the steel to aluminum contact.



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