bryanflood
Well Known Member
Hello all,
On my Rv-10 the vertical stab forward spar is attached by a single bolt with castle nut and cotter pin to allow rotational motion. The plans even call out for lubrication to aid the motion. I have always been curious about this design choice versus more rigidly fastening the forward spar like the rear spar. I.E. the rear spar of the vertical is rigidly mounted with several bolts. I have always theorized that the rotation allowed reduces the likelihood of flutter or perhaps it makes the assembly lighter by simply supporting the front spar in a more deterministic way and not cantilevering it like the rear spar.
I don't want to change the design, my goal is only to learn more and I have always been curious about this design choice. Can anyone explain why this design choice was made? What advantage does the single bolt design have over more rotational rigid mounting? There are so many smart people here I have to believe that someone is knowledgeable enough to actually explain it.
Thanks,
Bryan
On my Rv-10 the vertical stab forward spar is attached by a single bolt with castle nut and cotter pin to allow rotational motion. The plans even call out for lubrication to aid the motion. I have always been curious about this design choice versus more rigidly fastening the forward spar like the rear spar. I.E. the rear spar of the vertical is rigidly mounted with several bolts. I have always theorized that the rotation allowed reduces the likelihood of flutter or perhaps it makes the assembly lighter by simply supporting the front spar in a more deterministic way and not cantilevering it like the rear spar.
I don't want to change the design, my goal is only to learn more and I have always been curious about this design choice. Can anyone explain why this design choice was made? What advantage does the single bolt design have over more rotational rigid mounting? There are so many smart people here I have to believe that someone is knowledgeable enough to actually explain it.
Thanks,
Bryan