Steve,
The Teflon tubing you used, was it the stock I gave details of in terms of
the numbers on the spool?
My trial test required a fair bit of effort to pull the teflon through and
you wouldn't be able to get it through without slitting it first. Did you
use the installation method recommended in the Canard Pusher?
Reg
Tony Renshaw
>I am building a wing section for wind tunnel testing in the University of
>Illinois low speed wind tunnel. It is 18" chord by 34" span with a 20%
>chord aileron. I used standard aluminum piano hinge for the aileron hinge
>and was not satisfied with the amount of play in the new piano hinge
>(purchased from Wicks Aircraft). After seeing the posts about the
>teflon/stainless hinge pin modification I thought I had found the answer
>to the play in my hinge. I ordered the teflon tubing and bought a pound
>of stainless welding rod. These are the dimensions of the materials:
>
>original hinge pin .084"
>
>stainless welding rod .061"
>
>dia hole in hinge > .091" could only check with piece of brass tubing
> as I don't have a set of drills to verify
> diameter.
>
>stainless rod with
>teflon sleve .091" but would compress to .084"
>
>
>The stainless rod easily slid into the teflon sleve and the sleve/rod
>assembly easily slid into the hinge. There was still slop in the hinge
>after inserting the teflon/stainless rod due to the assembly being able
>to compress to .084" but it was a smoother operating hinge. It would
>seem that the modification would help prevent new hinges from wearing but
>I don't know about using it to repair a worn hinge. Would seem that a
>thicker wall teflon tubing would be required. I am on the look out for
>such teflon tubing. If anyone finds any please let me know.
>
>A 100 ft. of teflon tubing from McMaster-Carr was $14.00 USD and a pound
>of welding rod was $14.00 USD.
>
>Steve Eberhart
>newtech@newtech.com
>
>
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