RE: Europa-List: Tailplane flutter

[rparigor@suffolk.lib.ny.us]

Hello Ian

"Francis Donaldson asked me on Friday to pool any ideas we have on
eliminating slop in this area."

I am very happy with my resolution. I made pins out of 416SS ~.402" in
diameter. Interference fit between .0006" and .0008". I made a slight
dogbone (relief of a few thousands of an ") between interference contact
areas.

If I were to do it again I would make all the entrance holes slight larger
than the back side and eliminate the dogbone (I did this on a few holes).
I used paint primer as an assembly lubricant.

Search Ron Parigoris Torque Tube for a bit more detail on procedure.

A fixture for holding work is needed if the fit was as bad as mine
(trilobal holes, pins slide in with just gravity, way over 3/4"
differential motion at TE.

Burnishing is an essential (as described in my prior post) step for a true
interference fit.

Ron Parigoris