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Rye:
I think the large iron balls are a capital idea. They would look great =
on the binnacle, next to the parrot stand. I never thought of driving =
only north or south, but this would really reduce the flux lines cutting =
the keel. When a keel cuts the flux lines, eddy (no pun) currents are =
set up. These eddy currents act to counter the external field (Lenz's =
law). This effect can probably be greatly reduced by covering the keel =
entirely in tinfoil when planning to cut some flux linkages. The tinfoil =
can also be used for easy cleanup for the Mongolian BBQ (see previous =
degaussing tips). For those that think the tinfoil is too simplistic I =
would suggest the installation of two large Helmholtz coils on the boat =
trailer guides. These coils could be used to great advantage not only =
for necessary periodic degaussing but also to guide the boat onto the =
trailer in high winds and for inducing a strong 60 Hz magnetic field =
into the speakers of the blaring stereo in the car next to you. Other =
convieniences of the coils are that you can also degauss the anchor or =
park them under the power lines for free AC hookup.
Jim Nolan
-----Original Message-----
From: Rye Gewalt <ryeg@vais.net>
To: james nolan <nolan_laboratories@email.msn.com>; =
wwpotter@tscnet.com <wwpotter@tscnet.com>
Date: Sunday, July 18, 1999 11:42 AM
Subject: re: keel degaussing
=20
=20
Jim:=20
I know that several of the East Coast shipyards have degaussing =
facilities, but I doubt that you could schedule your Potter into them =
with out displacing an aircraft carrier or such.=20
I do, however, believe that you can remove the magnetism from a =
metal object by striking it sharply with a hammer or other heavy =
object. Perhaps you could remove the keel from your boat and give it a =
sound thrashing with a three pound sledge using care to strike each side =
equally so the keel does not bend in any particular direction. If your =
keel has been galvanized, this might damage the coating, but perhaps you =
could paint over the dings with epoxy paint. I think keel painting has =
been discussed at some length on the list....=20
I don't think that a magnetized trailer will be any problem as the =
field is probably not strong enough to be transferred to the keel of the =
boat. To keep the trailer from being magnetized by the earths magnetic =
field, I would suggest that you periodically park it facing different =
directions to neutralize any long term effects. It would probably be a =
good idea to try to drive only in north-south directions so that you =
only cut a minimal number of flux lines -- or maybe that would magnetize =
the thing even worse. Where's my physics book?......=20
Then of course you could add a pair of those big iron balls on each =
side of the compass like they do on the big ships to correct for =
residual magnetism, but I don't know what that would do to the stability =
of a small boat like the Potter. If they are placed near the front of =
the boat, they may allow you to point closer to the wind. Of course I =
don't know if I would like to become known as the guy in the Potter with =
the big iron balls. The little white balls that smell of ammonia seem =
to be about enough problem at this point.......=20
Regards=20
Rye=20
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I know that several of the East Coast shipyards have = degaussing=20 facilities, but I doubt that you could schedule your Potter into = them with=20 out displacing an aircraft carrier or such.=20
I do, however, believe that you can remove the magnetism from = a metal=20 object by striking it sharply with a hammer or other heavy=20 object. Perhaps you could remove the keel from your boat and = give it a=20 sound thrashing with a three pound sledge using care to strike each = side=20 equally so the keel does not bend in any particular direction. = If your=20 keel has been galvanized, this might damage the coating, but perhaps = you=20 could paint over the dings with epoxy paint. I think keel painting = has been=20 discussed at some length on the list....=20
I don't think that a magnetized trailer will be any problem = as the=20 field is probably not strong enough to be transferred to the keel of = the=20 boat. To keep the trailer from being magnetized by the earths = magnetic=20 field, I would suggest that you periodically park it facing = different=20 directions to neutralize any long term effects. It would = probably be a=20 good idea to try to drive only in north-south directions so that you = only=20 cut a minimal number of flux lines -- or maybe that would magnetize = the=20 thing even worse. Where's my physics book?...... =
Then of course you could add a pair of those big iron balls = on each=20 side of the compass like they do on the big ships to correct for = residual=20 magnetism, but I don't know what that would do to the stability of a = small=20 boat like the Potter. If they are placed near the front of the = boat,=20 they may allow you to point closer to the wind. Of course I = don't know=20 if I would like to become known as the guy in the Potter with the = big iron=20 balls. The little white balls that smell of ammonia seem to be = about=20 enough problem at this point.......=20
Regards
Rye