Drag link on servos

[Dean Pappas]

Hello Xavier,
To begin with, the special JR item that provides the hard-point is not really heavy. Using an existing hard-point in the airframe, is always going to be lighter, though.

If the servo uses a machine screw, then the appropriately longer screw can almost always be found in the RC car section of the hobby shop. The Futaba servos use a 2-mm screw. I'd be surprised if JR use a different size. If the output arm is plastic then it probably uses what looks (to me) to be a blunt-ended sheet-metal screw. You will have to hunt for the right sized screw ... I have no special source. A coarse-thread machine screw of the right diameter could work nicely, in the plastic.

The ball and the conical standoff, that help the linkage to clear the servo wheel, were part of the hardware package that came with the ball-link. I used a large Rocket City brand ball-link, because the 2-mm screw passes through the hole in it. If you use another brand, then fabricate a tiny hollow standoff, or use a stack of tiny washers.
Let me know if I didn't fully answer your question
Regards,
	Dean 


-----Original Message-----
From: Xavier Mouraux [mailto:xavier.mouraux at sympatico.ca]
Sent: Saturday, February 07, 2004 8:49 PM
To: discussion at nsrca.org
Subject: Drag link on servos


Hello all, and Dean Pappas in particular,

In the February issue of Flying Models, you show some drag links on servos.
I was planning on installing links like this on my planes latelly and the
article gave me some new ideas. However I am still stuck with the servo arm
screw/ball head problem.
What could I use to replace the screw on JR servos (digital and not) to
attach the ball link ? I have seen the special JR set-up before but it seems
heavy. Your suggestion looks better for my applications.

Anybody else with ideas for that ?

Thanks

Xavier

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