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<< Lancair Builders' Mail List >>
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I can vouch for those reed switches Jerry Grimmonpre' recommends. I plan to
put them on my landing gear and use them as positioning sensors also. I
field tested them on my car a few years ago on the salty dirty snow and
slush covered roads in Denver Colorado. I used the reed switches to detect
the positions of the linkage levers of my manual transmission under my car
to give a digital readout of what gear I was in. They survived direct
splashing with saltwater, slush and everything that a road could through at
them. The only problem I found with them is that they will stick if you try
to run more than 1/4 amp of current through them. If you keep the current
levels low below 100mA, they will work fine and last a long time. I
recommend using the smallest ones you can find so that they only actuate in
close proximity to the magnet. I also use them as safety interlocks on the
covers on some of my high voltage test fixtures. I never had one stop
working, they last a very long time. It is not surprising, they are very
simple mechanically, there is not much to wear out.
In case your all wondering why I needed a digital readout for what gear I
was in, I had a remote control start, so I had to have something to make
sure the car was in neutral before the starter motor kicked in.
Another thing I was thinking of doing was getting one of those little round
super magnets, mounting it in a ring, and making a James Bond ring that
unlocks your plane when you position it over a read switch hidden somewhere
under the composite by the door. Of course any magnet could unlock your
plane, but they would have to know where the reed switch was hidden. If
your friends are not all trust worth, you could have a decoy switch that
sets off an alarm. Or if you wanted to be more true to James Bond, make it
set off a bomb. Just kidding, have fun building.
Regards,
Ed Armstrong
Watsonville CA.
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