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[DPRG] Tarzan's lessons learned at the DPRG Outdoor Challenge
Subject: [DPRG] Tarzan's lessons learned at the DPRG Outdoor Challenge
From: Randy M. Dumse
rmd at newmicros.com
Date: Sun May 18 14:02:17 CDT 2008
William James said: Sunday, May 18, 2008 12:35 PM
> So I think you will at least need to have the robot moving to
> get a "reasonable" reading. But I think with all the variable
> magnetic fields around the robot, you really would need to
> put the compass as high and as far away from the robot as
possible.
Naval history eh? ;)
Navigators balls. Go on either side of the compass. These are to
balance out the field of the ship, being longwise fore and aft,
so these are placed port and starboard. They have arms which can
be adjusted for length to give the best balance. First thing I
needed to do when I got to my ship was swing the compass to see
if it was true, and adjust these accordingly.
Rather than sheild the compass from the ship, additional iron is
used to balance out the magnetic disturbance caused by the ship
so to make it more even all the way 'round.
The thing about standing still on land is to get rid of
accelerations which will swing the needle. At sea, you tend to
glide along without sudden accelerations. Of course, that's why
the compass is gymballed as well, to keep it upright in the
earth's field.
Randy
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