gear up warning trip switch

On Thursday, October 20, 2016 at 9:48:44 AM UTC-7, HGXC wrote:
I broke the gear up warning trip switch on my glider. It was positioned near the landing gear mechanism and had a wire that actuated a warning sound.

Des anyone know a source for a replacement?

Thanks,

Dennis DC

Mouser http://www.mouser.com/Search/Refine....rd=microswitch

or

Digikey http://www.digikey.com/product-searc...&newproducts=1

There's also a ton of them in things like retired (junked) copiers and other electronic equipment.

Cheers,
7Q

At 18:13 20 October 2016, Craig Funston wrote:
On Thursday, October 20, 2016 at 9:48:44 AM UTC-7, HGXC wrote:
I broke the gear up warning trip switch on my glider. It was positioned
near the landing gear mechanism and had a wire that actuated a warning
sound.

Des anyone know a source for a replacement?

Thanks,

Dennis DC

Mouser http://www.mouser.com/Search/Refine....rd=microswitch

or

Digikey
http://www.digikey.com/product-searc...&newproducts=1

There's also a ton of them in things like retired (junked) copiers and
other electronic equipment.

Cheers,
7Q


The idea is to avoid micro switches, I have had a lever fall off one in
flight, so had to fly with the wheel down for the rest of the flight to
stop the rackets from the buzzer, so use a reed switch, no physical contact
is needed, when the magnet is moved close to the reed it operate, the reed
could replace your micro switch, and the magnet where the actuator was.

If you use a magnetic reed switch, there's some more things to consider.

First you'll need to determine if the gear warning sounds when the switch is open, or closed. Both types of switch are available, with magnet present a switch may be closed (the most common type of reed switch) or it may be open with the magnet present (there being a tiny biasing magnet within the switch that closes the reed when the external magnet is moved away.

Then there are "wide gap" reed switches too. These are magnet polarity sensitive, so the external magnet needs to be positioned so the correct pole approaches the switch (these switches will still operate if the external magnet is positioned incorrectly - they will just revert to a very small gap).

If the magnet is to be mounted on steel (as in tubing etc.) then better performance will be had if the magnet is not mounted directly to the steel.