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Pull pull or normal push rod

Old 09-15-2002, 04:01 PM
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Default Pull pull or normal push rod

I have an option on my Chipmunk to use either the pull pull or normal hard wire push rod on the rudder... so which one is better? For pull pull I have to move the servo a little back with some more work but push rod systems is straight forward.

So which one should I prefer...?
Old 09-15-2002, 05:46 PM
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Default Pull pull or normal push rod

If the pull-pull system is within your grasp, definately use it.

1. It weighs less.
2. Much more effective use of the rudder.
3. It will not flex or bend as with a pushrod.


If using a pushrod, I would highly recommend carbon fiber as opposed to nyrod, metal, dowels, etc...

JMHO
Old 09-15-2002, 05:56 PM
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Default Pull pull or normal push rod

Hi!
Thin fishing wire is best, and lighter than a pushrod. And does not transfer vibration back to the servo eighter!
Carbon fiber rod or aluminum arrowshaft is what I use if I have to use a rod.
In small planes, around 150cm span, I use 10x10mm balsa rods for elevator and rudder were I canīt use wires.

Regards!
Jan K
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Old 09-16-2002, 12:23 AM
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Default Pull pull or normal push rod

Thin Fishing wire may not transmit vibration but it can be a source of glitching. I Use only Kevlar string and exit the fuse using teflon Tube. does not stretch with heat or cold like wire can...
Don///
Old 09-16-2002, 02:35 AM
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Default Pull pull or normal push rod

I second the use of Kevlar. Holds up very well and soesn't stretch. I also think it is easier to work with than wire.
Old 09-18-2002, 01:52 AM
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Default Pull pull or normal push rod

I have used pull pull wire cable a long time . It has worked for me on everything from park flyers to 1/4 scale. There are a lot of ways to rig with wire and it has never failed me yet
Old 09-18-2002, 10:12 AM
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Default Kevlar

One of Kevlar's best attributes is that it doesn't stretch. I first encountered it when it was used in the early 80s as suspension lines on parachutes. However, it doesn't have much abrasion resistance, so mount your system in such a way as to prevent the Kevlar from rubbing on exit tubes, etc..

Otherwise, it'll "fuzz" up.
Old 09-18-2002, 11:06 AM
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Default Pull pull or normal push rod

Mike,

You are right about that! If you use kevlar you should inspect it occasionally as it is subject to fraying. I have both wire and kevlar pull/pull systems. My wire system is about 12 years old and still in good shape. My kevlar system has been restrung once, after about 3 years of use, due to fraying at the fuselage exit. Good systems, both of them, but they all need periodic inspections.

Have fun!

Bedford
Old 09-18-2002, 09:14 PM
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Default Pull pull or normal push rod

The abrasion factor s the reason I use the Teflon Tubing to exit or where the lines cross. Had a Pull pull on a 1/4 scale plane for years with no known problems

Don//

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