Ed Sullivan wrote:
On Fri, 28 Sep 2007 05:18:45 GMT, Ed Sullivan
wrote:

On Thu, 27 Sep 2007 21:18:38 -0400, Ernest Christley
wrote:



The horns on the Dyke Delta are .100 4130. The prototype had flown for
over 40 years. If the horn was thin enough to deform from the rod end
being in single shear, it will bend just as much in double shear. There
is room for twist in the rod end even with both sides captured.
That may be so, but it has not been my experience. My horns and bell
cranks are a bit heavier however.

Anyway I'm too old to care

Ed

Seems to me I have seen bell cranks on both Pitts
Specials and Christen Eagles. They appeared to be no thicker than
.0625 and were in double shear as you describe. They must have held up
pretty good considering the stresses imposed on them in unllimited
aerobatics.

One thing I haven't seen mentioned is the length of the bell crank
arm or horns. I would assume a longer throw would require thicker
material assuming similar material.

Dan, U.S. Air Force, retired