Rudder pull pull question
#1
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Rudder pull pull question
Ok it's been about 15 years since I built my last plane, took a break, and now I am putting together a new plane.
I have run into an issue with the fuse being very narrow at the servo tray. I did some reserch on pull pull to refresh my memory and I got this out of it, the distance between the control horn connection holes and the distance between holes on the servo arm must be the same distance. Is that right or can the distance be less?
Thanks
I have run into an issue with the fuse being very narrow at the servo tray. I did some reserch on pull pull to refresh my memory and I got this out of it, the distance between the control horn connection holes and the distance between holes on the servo arm must be the same distance. Is that right or can the distance be less?
Thanks
#3
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RE: Rudder pull pull question
From my modeling experience you can have the distance narrower at the servo end then at the rudder end. But not in reverse as the lines will get too much slack when pulled to one direction or the other. the difference can't be too great either as binding will occur. I've used pull - pull on my airplanes and have always tried to keep the distance the same. If it meant that I had to move the lines in closer in on the rudder control horn then that's what I did. Do a search on this site for pull - pull control type installations and you'll get a lot of info.
Cheers
Cheers
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RE: Rudder pull pull question
It doesnt have to be exactly the same. I actually prefer for the servo arm to be narrower in order to take advantage of the full range of motion and torque of the servo.
#6
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RE: Rudder pull pull question
I'll add that I like to set the rudder horn slightly behind the center of the hinge. This allows the non pulling cable to go slightly slack, eliminating binds.
#8
RE: Rudder pull pull question
With the horn hole just behind the hinge line, and one line going a bit slack, can this cause flutter? It doesn't seem like it because with air pressure pushing on the rudder it can't move foreward.......
Thanks for any info,
Ernie
Thanks for any info,
Ernie
#10
RE: Rudder pull pull question
Okay, so if there is any positioning error when mounting the control horn (and trying to get it's holes lined up exactly with the hinge line...... if there is any error, it should be on the side of being slightly behind the hinge line. Otherwise, one line would go too tight with deflection. Right?
Or perhaps jus always mount the horn a hair behind the hinge line?
Ernie
Or perhaps jus always mount the horn a hair behind the hinge line?
Ernie