ORIGINAL: PatternPilot
David,
Deps is supper light and hardly any trim change , the lightness is the biggest key..
Back to the push rod in thread.. the bearing as such and the sleeve is mounted in the vertical tail post to keep it in line and will not let it move side to side..
I'm still in the north and should be home mid week and will get a set of plans and scan it and post it and the instructions.
Scott
Not so!! I've installed every style pushrod and even invented a couple new ways myself over the many years of doing this and I weighed almost every one. The dual elevator carbon rods are practically the same weight as twin 3421's in the stab, believe it or not.
The lightest by a wide margin is pull-pull kevlar cables. Compare around 1/2 ounce (pull-pull) with about 2 ounces for twin push rods, assuming and excluding the same servo in the fuse. The single push rod with two rods is heavier than these 3 methods. The heaviest is the MK belcrank ...... Why this silly thing EVER became popular is beyond me.
Don't forget there's weight in the support ladder this twin carbon rod set-up needs. The teflon tubes should be changed to thin walled PE. Teflon is about the densest plastic we have. PE is one of the least dense. Slipperiness is practically identical. After all, poly-tetrafluoro-ethylene (teflon) is first and foremost polyethylene (PE)
And BTW, as memory serves, the single pushrod with twin rods with the aft support was first observed in Ivan Kristensen models in the early 80's. But it may have been Ron Chidgey that actually invented it