Hello,

Looking to purchase a Sullivan Flex Pushrod System and noticed that they make a flex(Red) and semi-flex(blue). Both come w/ clevises. Looking to install in a Fun-Fly plane with a golf club shaft tail assembly.
Which one would be the best w/ this plane?... Red??...Blue???... or something better????

Thanks,
Phil

The Sullivan I use has a solid steel rod all the way through it. Some of the Sullivans use a plastic rod inside a plastic tube. These only have steel threads at the end. Unless you need to make a sharp turn get the all steel. The plastic on plastic needs to be supported more often and your trim will change with the weather. I can't tell you which color is which.

David

Not quite sure just what you are asking but this may help...
On some of my profiles with the servos near the wing I use
CF pushrods NOT attached to the FUS....

http://centralhobbies.com/control_linkage/pushrod.html

WORK GREAT !!!!!!
Walt..

Thanks guys!!!

This is the choices I have(see pics) in the Sullivan Flex-rod sytems. The instructions say to use this set-up. Only using this set-up for the tail surfaces.
Just don't know the difference between the two other than color.

Thanks

If those are your only choices, use the blue "semi flexable" ones...they're stiffer than the red ones which are too flexable for control surfaces on anything bigger that about .15 or so. You could use a red one for throttle though.

Thanks!!

O.K. guys... now I need to know what size to get: 4-40? or 2-56?

Now this is a 25-40 size Fun-fly competition plane with huge ailerons and elevators(from the early 90's) and usually has a hot engine w/ a tuned pipe. Not a fast plane, as far as speed, but for fast loops and rolls, spot landings,etc.
Leaning towards the set-up David(daveopam) suggested above.

Thanks,
Phil

Phil this is the stuff I use. It is 2-56 rod. It is plenty for your application. The key to using any of these is to support it at regular intervals. If you are using a golf club for a fuse then use a zip tie every 2"-3" all the way back. This will keep the flex out of the system.
It was common 15 years ago to see the flex rods used any many planes. At least around here it was. The guys would run it through the fuse for the elev and rudder. But they would only attach the outer tube where it exited the fuse and right behind the servos. I stuffed a friend Corsair for this very reason on the maiden. The rod would pull the elev down no problem,but it would not push the elev up once the plane got some airspeed.
Also, you can use the plastic like in your pic and make it better. Instead of using the supplied threaded couplers. Get some 12" rods threaded on one end. You can cut these down to three inches or whatever and use them. Just put the unthreaded end in the tube first and push it in till you can thread half of the threads into the tube. Then put the clevis on the half of the threads left sticking out. This adds a little weight but takes some of slop out of the nyrod.

David

O.K. David...I'll give it a try.

Thanks again!!!!