EMC 2 / Pull-Pull

JR 8411 Digital Servos & Berkeley Products

Goldberg Kwik-Link 2-56 Clevis

Sullivan 2-56 Brass Threaded couplers

This page shows how my EMC is configured with Pull-Pull cables on the Rudder and Elevator.  The configuration is based on information from Ron Ellis, Gene Maurice, Sam Turner, and Rick Byrd, all of whom shared their methods and techniques freely. 

After the Lubbock contest, where I had looked long and hard at Gene Maurice's beatiful Sam Turner "Pursuit", I decided I just had to try it.  Todd Blose, Rick Byrd, BW Ponder, and several other Texas friends had "discovered" pull-pull a long time ago. 

Some key points:

JR's newest 8411 Digital servos.  Incredible power, and resolution you can't believe until you see it.  Mine are running on my 5 cell pack, so torque is an AMAZING 175 in/oz!!!   Speed is .08 for 60degrees. 

 ONE cable for top of Elevator, one for bottom.  Cable goes from one side, through crimp, looped through servo arm, back through crimp, then to OTHER side brass tube/clevis.   Crimped with slight tension on cable.  Then front crimp is snugged about 1/2" behind servo arm, and crimped.  Adjustment of cable tension is done after both top and bottom cables are both installed.

 2-56 Threaded tube crimped on cable, drop of CA to secure.  Be careful to NOT get on threads!!

 Crimp sleeves crimped twice.  Drop of CA to Secure.

JR 8411 Side mounted on Stab Centerline for geometry purposes.  Very easy, very strong.

Shows single cable looped through servo arm, through sleeve, then back to control surface.

Here is the "string" arrangement...kinda cool lookin', but nothing touches each other.  Easier than it looks.

Here's the Control ends...Brass couplers crimped and ca'd...works GREAT!!!  Control takeoff is 6-32 SS threaded, Goldberg 1/8" control attachments...lock nuts/washers allow minute adjustments.  NO wear on the Nylon to nylon parts....you won't believe it until you try it!!

How the crimp is done...not too hard!!