Control Linkage Question - 1/4 Scale Dynaflite Decathlon - Page 2 - RC Groups
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Mar 01, 2013, 01:06 PM
Registered User
Decided to look at the ailerons next:
(click on image to enlarge)

First image below shows the aileron control rod at a pretty strong angle to the control horn on the aileron. I would think that the rod should be more of a 90 degree with the aileron. Comments or advice?

(I believe that the original builder made the control horn attach at the location shown (on the plans) to be on top of a small ply plate (on the bottom side of the aileron). I'm thinking about redoing a new ply plate and control horn location.) (screws flush with wing are screws to attach wing struts.)

Also, the aileron servo has a large servo horn attached to top of standard servo horn wheel (I have never seen this large an aileron servo horn). Is there any issues with using a large servo horn like this one?
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Mar 01, 2013, 01:14 PM
ARFs Are Me
TomCrump's Avatar
Nice job on the rebuild !

Your servo horn looks ok, to me. The aileron horn does need to be moved, so that you have a 90 degree angle, as you said.
Mar 01, 2013, 10:46 PM
Registered User
SunDevilPilot's Avatar
I usually have my rods at a slight angle, no where near what you have in the photo. Remember, the arm travels in an arch so I make my rod 90 degrees when the servo is 1/2 way through its travel on one side.

Mar 02, 2013, 10:31 AM
Hope to get out of life alive
kenh3497's Avatar
I'm thinking the servo was originally to be laid on it's side with only the arm exposed. I've seen the long heavy duty arms are used on the IMAC style planes. Nothing wrong with them.

Short of redoing the servo mount, you could just adjust the rod length and servo arm position to get closer to the 90 degrees you need. If it were my plane I would bite the bullet and make new servo mounts, but that is me. The servo mount and hatch cover would be one in the same with the servo attached to the cover. Do as you feel is best for you.

Mar 04, 2013, 01:05 PM
Registered User
Don't like the horn location on the ailerons, looks like they may bind at extreme travel. If so, the 90 degree position is preferable. What's the torque of the servos? and the wingspan of the plane? Does your manual give you a recommendation of servo torque for the ailerons?
Mar 04, 2013, 08:41 PM
Bellanca Kruesair
epoxyearl's Avatar
I'm playing 'catch-up' here...The longer arm on the servo is probably to get more "throw"-DUH !, but it looks like someone wanted to fly 3-D with it, to me.

When you deflect that long a servo arm, it kind of 'locks' the aileron at full deflection, if you can imagine what I'm trying to say.- Deflect the servo by hand to full throw, and see if the servo arm points directly at the aileron horn......that's a Good thing, if the servo has enough torque to do it.

I think the "standard" servo arm aligns pretty well,and no one bothered to move the horn,when the long arm was installed.
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