[NSRCA-discussion] Pull-pull setups

[Keith Black]

I also use the Teflon coated Kevlar from Matt K. It's extremely light and unlike standard Kevlar there's not the worry of it fraying if it rubs the exit holes coming out of the fuse. 

Keith
  ----- Original Message ----- 
  From: Koenig, Tom 
  To: NSRCA Mailing List 
  Sent: Wednesday, January 23, 2008 9:45 PM
  Subject: Re: [NSRCA-discussion] Pull-pull setups


  I have used Matt K's Kevlar, ......its Teflon Coated, works very well and he used to have it in a number of colours.

   

  Matt..you may want to chime in?

   

  Tom

   


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  From: nsrca-discussion-bounces at lists.nsrca.org [mailto:nsrca-discussion-bounces at lists.nsrca.org] On Behalf Of J N Hiller
  Sent: Thursday, 24 January 2008 1:43 PM
  To: NSRCA Mailing List
  Subject: Re: [NSRCA-discussion] Pull-pull setups

   

  I make them from 'G-10' fiberglass sheet available from FTE.  http://www.franktiano.com I laminate 3 .03" thick for to get .09" thick. I pivot them on 1/8 shaft using brass tube bearing through a 3/8" dowel hub for secure gluing and to prevent flexing of a long shaft. Here is a photo showing the entire sub-assembly, which I build and set-up before installation in the fuselage.

  Jim

   

  -----Original Message-----
  From: nsrca-discussion-bounces at lists.nsrca.org [mailto:nsrca-discussion-bounces at lists.nsrca.org]On Behalf Of CHV69 at aol.com
  Sent: Wednesday, January 23, 2008 5:09 PM
  To: nsrca-discussion at lists.nsrca.org
  Subject: Re: [NSRCA-discussion] Pull-pull setups

   

  In a message dated 1/23/2008 8:06:14 P.M. Eastern Standard Time, jnhiller at earthlink.net writes:

  John, I can't comment on Kevlar. I have only used steel (.021" Sig control line cable). I also use internal bell cranks to eliminate cable tension load on the servo mount rubber grommets and shaft. This way I can run the cables quite snug. Short ball link connectors connect the bell cranks to the servo.  By using different holes in the servo wheel or bell crank I can use the full servo travel, and reduce the control surface travel without resorting to non-parallel linkage or transmitter endpoint and accompanying resolution reduction.

  I haven't been totally happy using dual elevator servos so I cable them as well, connecting all 4 cables to a single bell crank. It is quite easy to balance the travel, center and end-points by adjusting the threaded control horn and cable length. When I started doing this it yielded the tightest system I ever used.

  For what it is worth.

  I like that idea for the elevator setup.

  What type of bell crank is it that you use?

   

  Carl






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