CTE pull pull

[Atwood, Mark]

For those using Nylon coated steel fishing leader...a VERY simple VERY strong way to fasten the cables rather than all the crimping...which I hate..is to simply loop the wire through the eyelet and twist it back on itself and hold a lit match next to it for about 2 seconds...the nylon melt and voila...it's attached.

I personally guarantee that you will snap the steel cable (20-30lb test) before the bond breaks.  12 years and running...never had one let go.

-Mark


-----Original Message-----
From:	Bob Pastorello [mailto:rcaerobob at cox.net]
Sent:	Tue 11/25/2003 8:32 PM
To:	discussion at nsrca.org
Cc:	
Subject:	Re: CTE

Keith - once you do pull-pull, you will be surprised at how slop-free, and maintenance-free it remains.  Also lots less wear on servo centering...IMHO
    I've had 7 or 8 now with pull-pull elevator.  I don't even consider any other way.

Bob Pastorello, Oklahoma
NSRCA 199, AMA 46373
rcaerobob at cox.net
www.rcaerobats.net


  ----- Original Message ----- 
  From: Keith Black 
  To: discussion at nsrca.org 
  Sent: Tuesday, November 25, 2003 7:26 PM
  Subject: Re: CTE


  I'm using servos in my stab on my current Aries and what you've just pointed out is really the only concern I have about the setup. Since the servo is buried in the stab the control arm must be at least a certain length to extend out far enough to attach the push-rod and not bump into the base of the stab. The result is that this ends up creating too much throw at the servo arm and thus you're not using 100% of your servo range in moving the elevator. I've already got the control horn position as far out as it can go but I still only use about 65% to 70% of my servo travel.

  That being said, I really haven't noticed it being to sensitive or not enough granularity in the elevator control and I have not observed any problems with the elevator halves throwing unevenly. I have just over 100 flights on the plane. I've had several other pattern pilots fly my plane (even recently), from Advanced to FAI, and everyone seems to think it flies very true and straight. 

  Now, after that glowing endorsement I must tell you that on the new plane I'm building I plan on using pull-pull on the elevator. Why? Ease of setup and to see if I notice any differences.

  Here's a link to a picture of my stab with the servo embedded. The servo is the JR DS3421 mini digital, it's an awesome servo for this application. 

  http://www.fototime.com/E1B3341FEB6EA82/standard.jpg 

  Keith Black
    ----- Original Message ----- 
    From: Alan Simmonds 
    To: discussion at nsrca.org 
    Sent: Tuesday, November 25, 2003 6:50 PM
    Subject: RE: CTE


    <My current thinking is that I will still mount the servo in the same area and go with cables.Very light and direct.>  

    Georgie
    I am also deliberating whether to use stab mounted elevator servos on my next model but I'm curious about how the geometry would work on a closed loop setup and still use a good proportion of the servo rotation.  Any thoughts?
    Alan


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