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Push / Pull servo setup

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Old 12-03-2003 | 07:25 PM
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From: Aliso Viejo, CA,
Default Push / Pull servo setup

i have heard a great deal of people saying that you should mount the rudder and elevator servos in the tail on an ultra stik 60. i want to do this, but I have a few questions.

If I want to set them up with push/pull, do i need to get the two cables and make it pull/pull? Or would it just be fine to use two regular metel control rods, esentially making it push/pull?

I have seen pics using the pull/pull method with the two wires, but is there an advantage to one way over the other?

all your help is greatly appreciated.

Oh. BTW, post some pics if you have them to help me visualize it. Plus I love seeing pics of peoples' airplanes.
Old 12-03-2003 | 10:33 PM
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Default RE: Push / Pull servo setup

More a quetion of CG balance. If you use a heavy oversize engine, put the servos in the rear. Light engine, pull/pull or pushrod, either one works well. Whichever one is easier to install.
Old 12-04-2003 | 10:14 AM
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Default RE: Push / Pull servo setup

I agree with Flypaper 2. I normally mount the engine first, then rubber band the servos in place to see where they need to go for balance. I set up for the rear of the CG range, then move the battery forward for the test flight.
Old 12-12-2003 | 11:49 PM
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From: Chico, CA
Default RE: Push / Pull servo setup

Dear antman--the previous posters have given you some good pointers on c/g and figuring servo location...I will attempt to answer your question about pull/pull rudder....This is a neat system generally used with larger planes with lots of rudder and lots of control throw. The advantage it offers is that there is no slop in the rudder control (each cable is pretensioned against the other side). Also it allows more throw (with longer control horns on the rudder) and generally the angle is much better with two cabels than a rod on one side. The drawback is it requires a very strong (expensive) servo to control all that throw/surface area.

If and when you install your first pull/pull the only advice I would offer is always WRAP your control wires try to avoid the solder-type
threaded couplers that come with some kits.......the control wires are small diameter and it's tuff for me anyway to get a good solder job........

Hope that's somewhat helpful

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