Netters,
One (of the three) pushtubes for the elevator in my KR-2 is 63 inches long by 1
1/4 diameter by .125 wall. It seems heavy and overdone, but my KR-2 shed 6
pounds in the process of removing the cable system and replacing with pushrods
for the ailerons and elevator. Virtue and peace of mind are their own rewards.
Sid Wood, Tri-gear KR-2 N6242
Mechanicsville, MD [email protected]
-----Original Message-----
From: Colin & Bev Rainey [mailto:[email protected]]
Netters,
Just remember if you desire to make a long run of the pushtube as I
did, you have to increase the diameter of the tube relative to the length. In
other words the longer the bigger. I believe Dana in his RV has one that is
thin wall 1 1/2" T6 aluminum, to go a distance of some 6-7' . My friend Bill
who has a Thorp T-18 has almost the same length run and uses the same diameter.
He is a mechanical engineer and told me that runs over 4 feet have to be twice
as strong in compression (the pushing part) as it does shorter than that. My
tube is 1" thick walled T6, with an interior piece of 5/8" that was the
original tube before I found out about the compression issue. Dana has a list
of parts he used to assemble his and I am sure if you write him he would send
you a copy of that list. I prefer the pushtube for the elevator control,
because there is alot more solid feel to it, and that is re-assuring to me,
considering that I can make up for the failure of one of either of the other
controls, but pitch is next to impossible to have a back-up plan for unless
your KR is equipped with elevator trim.
Colin & Bev Rainey
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