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Re: S-Tec 50 Autopilot
- To: Velocity List-Reflector <email@example.com>
- Subject: Re: S-Tec 50 Autopilot
- From: dmp@TmedBSD.MCG.EDU
- Date: Fri, 12 Jun 1998 08:18:19 +0000
- Comments: Authenticated sender is <dmp@TmedBSD.MCG.EDU>
- Organization: Medical College of GA
- Priority: normal
> From: "James F. Agnew" <RRT0162@IBM.NET>
> Brian, something to think about, on my sail boat I had an autopilot that
> used an analog computer with a flux gate sensor for heading
> information. This system used a feedback loop from the "rudder" so it
There's also a compass module from Precision Navigation that doesn't
use a flux gate. Two degree accuracy, one degree resolution, can
calibrate out magnetic fields, serial, 5 per second output.
$100 for the gimbaled version, $80 for the non-gimbaled from Jameco.
Jameco is also carrying the Crossbow accelerometer modules.
> could tell how much it was using to turn. It used the rate of change
> from the sensor to determine how much and how fast to to move the rudder
> and used a variable speed (pulse width modulation) electric motor to
> move the rudder. Because of this setup it could react quickly to large
> movements and back off as it came to center so it wouldn't overshoot.
> It also looked at the number of corrections in the same direction and
> after several would find a new centering heading to set a crab to offset
> drift. Something to think about in your design. You can now buy Flux
> Gate sensor black boxes with several types of output, I don't have the
> address but I could find it.
> PS - this unit was for a 9 ton boat and had a 1250 pound thrust
> hydraulic ram so it is probably is a litle heavy duty for aircraft
> use!! (:>)
> // James F. Agnew
> // Tampa, FL
> // Velocity 173 FG Elite ( http://www.VelocityAircraft.com/ ) under