Upgrade TRIM

[Av8r3400]

Just as one man's opinion, I would be very leery of controlling a trim tab using just a push-pull cable.

The inherent "slop" there may be small, but it is the window that can allow flutter to start. By adding a spring to the tab and using the cable as a pull only actuator eliminates this potential. Ackselle, in your situation putting a compression spring over the cable between the rear cable mounting bolt and the trim tab horn would preload the cable into the pull only movement. These cables are really not designed to push. A very small bend in the cable, outside the housing, weakens it's ability to push significantly.

Another solution is to use two cables both in the pull orientation with springs to hold them tight.

[Slyfox]

no matter how you put a trim in the elevator. I know I would not do without mine. I went and ripped the elevator apart and cut and welded all the pieces that kitfox had. I put in the electric trim motor and now have it in the stick. I love it. makes flying fun.

if you want to see what it looks like go here http://www.teamkitfox.com/Forums/alb...pictureid=4270

look at the right side of the elevator it's built into it.

[Jfquebec]

Van's aircraft have a trim cable...i dont have a pic of that...but my friend build an rv-7 and he have one...it is a realy good product...you turn the button left and right > the cable turn > and at the end it is a steel rod come in and out...

[Slyfox]

the advantage of electric trim, like I have, is if using the rayallen stuff, you have a visual of where the trim is. very nice.

I'm sure with the lever and cable, as long as there is no slop in the system. should work very nicely.

[ackselle]

Larry.... I don't disagree..... My trim is VERY simple. The push/pull cable is super stiff and works very well. I actually have the parts from Kitfox to change it to the larger elevator and "normal" trim....but I keep on putting the project off because my system works so well. I've got just around 450 hours on my current trim.... One day I'll switch to the real one.

[Olle1975]

The push/pull cable is super stiff and works very well

Do you have pictures?

[Av8r3400]

His photos were on page three of this thread.

Link

[Olle1975]

Sry.........

[Av8r3400]

[Olle1975]

Thanks for help, the build is completed.
I cut a few sheets and mounted it with a hinge at the elevator.
A steel cable (pull & push) is install throught the fuselage and it's
connect with a throttle-stick under seat.
Now I could exactly adjust the trimtab by rotating the throotle, works fine :-)

Olaf