There are a number of comparisons of the digitrak and navaid available on
the net.
The one I am thinking of is at
http://pws.prserv.net/thoug/autopilot/compare.html
But the link doesn't seen to work a t the moment.
There are others and a search with the words digitrak and navaid will bring
them up.
Duncan McF.
----- Original Message -----
From: "Tony Renshaw" <tonyrenshaw@optusnet.com.au>
Subject: Europa-List: Autopilots and their Servos
<tonyrenshaw@optusnet.com.au>
>
> Gidday,
> This is a query for those that might know the difference between the
Navaid
> Servo and the TruTrak, whether one or other is digital versus analogue
> controlled, what type of mechanisms they are, and whether there is a
strong
> argument for one over the other. With Autopilots, the TrioAvionics unit
> appears to have the most capable head, and it uses the Navaid Servo. I
> asked about the servo and they cost $685 US, which is about $50 more than
> through Navaid, because they strip them down, adjust a few cogs, and also
> adjust the potentiometer, to dampen out some of the oscillation
> characteristics of these units, and then bench test with one of their
> control heads. So, when speaking to a TruTrak friend, he says his servo
> uses a stepper motor, which by the accurate way it stops and starts
> suggests a digital control, where the Navaid has potentiometers, so this
> implies an analogue signal, doesn't it. I am wondering if the Trio is
> particularly good with their head capabilities, but lacking with the
> technology put into their servos, or should I say, their choice to use the
> Navaid product. So, if anyone can shed any light on how these things work,
> and whether one is significantly better than the other, well I'd love to
know.
>
> Reg
> Tony Renshaw
> Sydney Australia
>
> Classic 236 B.B. Taildragger (possibly convertible)
> Tail, Wings, Ailerons, Flaps Complete and Connected
> Lower Fuse in Jig, Tail Torque Tube installed
> Mass Balance assembly installed and deflections sorted
> Intended Engine: 912S CS prop (model undecided)
> Instrumentation: Undecided
>
>
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