Article View: rec.models.rc
Article #2151Re: Connecting pushrods to servos
From: Steven W Bixby
Date: Fri, 29 Jan 1993 00:59
Date: Fri, 29 Jan 1993 00:59
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2293 bytes
< EZ-connectors comments > >>I prefer to use adjustable clevises on both ends of a pushrod. > ^^^^^^^^^ >I assume you use a lock nut on atleast one end to prevent the pushrod >from lengthening or shortening due to vibration? Not a flame, just wanna >be sure the neophytes don't get the wrong impression. Errr.. Wait a minute, think about this a second. If one end of the rod rotates in the clevis, then the other one does too. The rod may slide one way or the other by rotating, but the length remains the same (assuming 2-56 threads...) Now, this is not to say I 'condone' using un-lock-nutted clevises on both ends of a rod...! The pushrod could rotate enough to completely come out of one clevis. And, it could advance far enough into one side to cause binding, and eventually battery run-down, and so forth. My personal choice, which I use on virtually EVERY pushrod type installation is Z bends on the servo end, and STEEL clevises, locknutted to prevent metal-to-metal noise, as well as a piece of fuel tubing over the closed clevis to prevent it from popping off under load. For smaller planes and gliders, I will use nylon clevises, if the horn is also nylon; a miniscule amount of weight, and no need for a locknut. The only place I will use EZ-connectors is for nose-wheel steering (usually not there, either) and throttle. These are more adjustment prone items, and often harder to get at the end opposite the servo. Several years ago I did use EZ's on my flight surfaces, but my rudder on a tail-dragger popped the EZ off the servo a couple of times on landing, and I decided it was CHEAPER, STRONGER, and MORE RELIABLE to use Z-bends. The available z-bender pliers are really good for this - one of my most favorite tools, in fact. :) -swb- (Steve Bixby, sbixby@cup.portal.com)
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Path: arc1-ca.pugleaf.net!sparky!uunet!portal!cup.portal.com!sbixby From: sbixby@cup.portal.com (Steven W Bixby) Newsgroups: rec.models.rc Subject: Re: Connecting pushrods to servos Message-ID: <74544@cup.portal.com> Date: Thu, 28 Jan 93 16:59:00 PST Organization: The Portal System (TM) Distribution: usa References: <C189q0.F7M@csn.org> <96800@rphroy.ph.gmr.com> <1993Jan26.164834.21125@dcdwest.uucp> Lines: 36