Ship: GP Patty Wagstaff Extra 300S
Engine: DA 50
Rx: Futaba 9 channel
Rudder Servo: JR 8611

I've seen others use kevlar cord in set ups similar to this because they claimed this prevented potential issues with RF interference.

My LHS doesn't carry kevlar nor have I looked though the fishing line dept at my local sporting goods store.

Can someone offer any guidance or recommendations on steel pull pull cable setups when used on an aircraft with a gas engine?

I can get the Dubro HD set up for $17 complete with control horns anywhere and would like to for convenience sake -if someone can give me a warm and fuzzy with first hand experience with a similar outfit...

Many thanks,
Shane

I use the braided nylon covered steel line all the time. I've never had a problem with RF interferance on some 8 to 10 big birds. I use the pull-pull on both elevator and rudder on all of them.

Thank you Rodney.

I assume when you say "big birds" that you're running gasoline engines?
If so, do they utilize electronic or magneto ignition systems?

Do you feel it would it make any difference whatsoever?

Shane

Big_Daddy,
What you need to NOT do is have two pieces of steel come in contact with each other.
This includes your connectors. If the steel connects directly to nylon there is no problem.
The fear is that the steel-to-steel connection will vibrate and if there is any possibility of
static in the air you have just created a spark-gap-generator. This produces RF signals on all channels.
Good Luck,
KW_Counter

Don's hobby...Salina, KS. carries the kevlar you might be looking for. If not then follow the advice of those previously posted, and you shouldn't have any prob. I've used the kevlar with excellent results, for pull-pull, as well as flying-wires. It's fairly cheap too. He sells a whole kit, or just the kevlar in bulk. Not quite sure of the website at the moment...good luck though

To answer your question, YES, I have used the Dubro 4-40 heavy duty pull-pull cable hardware (plastic coated steel cables) on several planes including two with ignition engines. One engine is a stock G-62 and the other is a Fuji 64, and both have stock (magnito) ignition systems. Never had a problem with radio interference in either case. HOWEVER, besides the good tips mentioned above, I also avoid running my receiver antenna in close proximity to and directly parallel to the pull-pull cables. Don't know for sure, but was told that doing so might create some issues if the cables (as in this case) are electrically conductive.

Lee

All my engines are Quadras except for one. All the Quadras have magnetos and have not presented any RF problems. My antennas also run parallel with the cables with no problems evidenced but there is probably about 1 to 2 inches seperation.

Hi Shane

Using the nylon coated fishing trace is perfect. Always make sure that they do not twist which will cause them to chaffe through. Also ensure proper crimped ends and put lock nuts on the clevises to prevent them from twisting themselves out. A drop of cyno also works but means you can't adjust it anymore.