[NSRCA-discussion] control horns

Scott Smith js.smith at verizon.net
Fri Nov 3 15:18:32 AKST 2006


Servo arm is 7mm, control horn is 36mm from the hinge (top hinged Brio,
small 3412SA servo!)  ATV's are 112% and 115% to give +- 21 degrees.  Dual
rates are dialed down to +- 15 degrees.
  -----Original Message-----
  From: vicenterc at comcast.net [mailto:vicenterc at comcast.net]
  Sent: Friday, November 03, 2006 5:43 PM
  To: NSRCA Mailing List; NSRCA Mailing List
  Cc: Scott Smith
  Subject: Re: [NSRCA-discussion] control horns


  Question or comment:

  In the picture I see that you use long servo arm.  Looks like the ratio in
your linkage is very close to 1:1.  I could be wrong because the angle in
the picture.  In my pattern planes, I usually finish with a ratio of 1:3.
That means that if the horn (distance to the hinge line) is 1.5 inches, I
use 1/2 inch servo arm.  Usually the servo arms that come in the servo works
well for me.  One time I tried to set up with a ratio one to one and the
plane was practically unflyable for precision.  I use for elevator high rate
(spins) about 20 degrees having the radio rate set 150% (60 degree of servo
movement is converted to 20 degrees in the control surface).  I use the
flying modes to reduce the throws for normal fly to get around 8-10 degrees
(around 65% in the flying mode).

  What is your experience in this regard?

  Vicente "Vince" Bortone
    -------------- Original message --------------
    From: "Scott Smith" <js.smith at verizon.net>

    I've used 3/32 aircraft ply laminated with CF epoxied into a 1/8" slot.
Shape as needed to get it over the hinge line.


        -----Original Message-----
      From: nsrca-discussion-bounces at lists.nsrca.org
[mailto:nsrca-discussion-bounces at lists.nsrca.org]On Behalf Of JShulman
      Sent: Friday, November 03, 2006 5:03 PM
      To: NSRCA Mailing List
      Subject: Re: [NSRCA-discussion] control horns


      cause that was back on the Jekyll and the wing was only 3/4" thick. It
was easy to get it centered on the hinge line. I think the new wing
thickness is double that so I might need a bit more reach forward.

      Regards,
      Jason
      www.jasonshulman.com
      www.shulmanaviation.com
      www.composite-arf.com

        -----Original Message-----
        From: nsrca-discussion-bounces at lists.nsrca.org
[mailto:nsrca-discussion-bounces at lists.nsrca.org]On Behalf Of Rick Kent
        Sent: Friday, November 03, 2006 4:45 PM
        To: nsrca-discussion at lists.nsrca.org
        Subject: Re: [NSRCA-discussion] control horns


              If a bolt and aileron horn works well, why change it?

              Rick

              -------Original Message-------

              From: JShulman
              Date: 11/03/06 16:35:14
              To: NSRCA
              Subject: [NSRCA-discussion] control horns

              Hi all,

              What are you guys using for control horns on your planes? Last
things I used
              were a 6/32 bolt and "aileron horns" with a clevis. Is that
still the way to
              do it or is there something better. Not interested in the MK
BB stuff, too
              "good" for me.

              Thanks,
              Jason
              www.jasonshulman.com
              www.shulmanaviation.com
              www.composite-arf.com


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