In a message dated 10/26/2006 10:36:01 P.M. Central Standard Time,
kneefjes@cogeco.ca writes:
Has anyone out there with a L360 had problems
with aileron vibration?
I have just completed my project and am
very happy with all aspects of this airplane but I can't get rid of this
buzz. It happens at most power settings/airspeeds and all control
linkages/tubes are free from any rubbing/binding. This is not a
huge amount of vibration but I feel any amount only means excessive wear
etc.
During first flight we noticed it so into the
shop it went. I replaced all the bellcrank bearings because of minimal slop
and that helped immensely but I still see some play within the aileron
hinges. Looking back to previous discussions, I see some have tried a
modified hinge pin/insert. Could anyone give me an update on how that
has worked for them and also, any updates on solutions that have worked
for you.
Kevin,
1. Hinge hole diameter in MS hinge material is 0.0930 +.005/-.000
and MS hinge material is .089 +/- .001. The play right out of the box
is 0.003 to .010. A 0.0955" reamer can be used to remove burrs if
necessary since hinges seem to be larger. Stainless steel welding rod
can be obtained that is 3/32 diameter (0.09375). I use 3/32 SS rods and my
hinges are tighter with no increase in friction and a great reduction in hinge
play and lash. If I clamp one aileron, the other one will move less than
1/2 under a mild push.
2. My ailerons are rigged so that both are slightly up. This places
a very small load on the system so that the ailerons are not floating in a
neutral dead band subject to natural vibration.
Are you sure the elevators are not contributing to the buzz?
Scott Krueger
AKA Grayhawk
Lancair N92EX IO320 SB 89/96
Aurora, IL (KARR)
A man
has got to know his limitations.