Pull-Pull cable

[ronlock at comcast.net]

Hi Matt,

Braided kevlar & teflon tape - wow, sounds like neat suff, and also a serious craftsmanship exercise to make it.   I'm using vinyl coated kevlar from ACP- certainly easier, but maybe your braided cable is even better?

Later, Ron Lockhart

-------------- Original message -------------- 

Sure Keith, no I don't buy new equipment every year. The longest period is probably with Alliance. I started flying the model in 2001and stopped flying it after the 2003 season. According to my log, 468 flights in the 2+ year span. I check things every few months as a rule just to make sure things are tight etc. All servos in the fuse (original install) were fine throughout this period. They are still in the plane. 

Wing servos had developed a slight amount of slop but wasn't bad enough to tear down. Being used elsewhere now since the wing is down for refinish.

Pull-pull on rudder and elevator, steel rod on throttle, 1/8" carbon rods on ailerons. Note that the original rudder and stab were discarded in favor of lighter units. Also note that cable I use is unique: braided Kevlar with teflon tape wrapping. I made this material. Very forgiving set-up, and with light control surfaces, less force transfers to the servo. Servos are a mix 4001, 4131, 8231 and 8411, plus a retract servo (403?). 8411 on rudder. 

The servo bay in this model was equipped with a lite ply tray, a one piece unit that covered the whole bay. Secured to the fuse with probond. I think the one piece tray helps also. Engine mount is the standard Hyde type that I make. Originally saw the procedure on Bob's web site and have made these ever since. Very simple and very inexpensive.

MattK

In a message dated 12/1/2004 3:00:47 AM Eastern Standard Time, tkeithb at comcast.net writes:
>> I have yet to change gears on a rudder servo or have parts come loose. And rudder centering is fine.

Matt, can you please clarify this statement? Is this because you get a new plane with new servos each year, or are you saying that you go multiple years without every changing servo gears? 

What are the most flights you have on any one rudder servo, and what type of servo.

Thanks,
Keith Black
----- Original Message ----- 
From: Rcmaster199 at aol.com 
To: discussion at nsrca.org 
Sent: Tuesday, November 30, 2004 7:28 PM
Subject: Re: Pull-Pull servos


Hi Jim, the horn on the rudder should be as long as you can bare that will result in minimal slack cable syndrome. I normally use a 3" long 6-32 bolt, and bend it slightly to place the horns on the hinge line. On the kits I've built, I typically discard the stock rudder and build a lighter version. I shoot for a finished weight around 45 grams or less for this size rudder. I keep the cables snug but not too tight. NOT like a guitar string. I have yet to change gears on a rudder servo or have parts come loose. And rudder centering is fine.

Matt
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