CTE pull pull

[Bob Pastorello]

A great idea, Mark.  But with my luck, I'd end up setting the whole plane
ablaze!!  (Of course, I have YET to do my first pull-pull elevator without
at least ONE twist!!)

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


----- Original Message ----- 
From: "Atwood, Mark" <atwoodm at paragon-inc.com>
To: <discussion at nsrca.org>
Sent: Tuesday, November 25, 2003 7:40 PM
Subject: RE: CTE pull pull


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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