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Subject: Re: Fluxgate compass /benefits of 3 axis
From: Rodney Myrvaagnes (rodneym@XXX.XXX)
Date: Fri Feb 01 2002 - 11:07:18 EST
A practical but incomplete solution is found in some higher-end autopilots (which i haven't used myself). But Sally Lindsay and Stan Honey won their division in
the Pacific Cup with the Cal 40 Illusion, using a below-deck tiller pilot (Robertson, IIRC) Sally said they could adjust rate-of-change damping separately from first-
order sensitivity. By retarding the rate response they kept the autopilot working under spinnaker for the 3,000 nm trip.
I think this is making the autopilot use its compass in a longer time-constant averaging mode, which is of course what a human helmsman tries to do.
But, George is absolutely right that you can't separate signals at the same frequency.
On Fri, 1 Feb 2002 15:47:03 +0000, George Huxtable wrote:
>This isn't too serious if the compass is simply being used to
>measure the average course, as long as there are landmarks around us which
>we can watch to maintain a short-term heading. The problems occur when we
>want to feed the compass information immediately back to the steering to
>try to maintain a steady course.
>
Rodney Myrvaagnes J36 Gjo/a
"A balanced diet is a cookie in each hand."
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