This is what I use in my Spirit Sailplane and my Electrajet park flyer.
It is called a Digi-Alarm
http://www.californiasailplanes.com/...l%20alarm.html
It hooks to any channel or it can share a channel with one of your servos. It
has the connector to pass through to the servo.
This will work in any plane with a 72 MHZ receiver. This is the one I
recommend to everyone.
Low Voltage Watch
In addition to helping me find the planes, the Digi Alarm also monitors my
battery pack voltage and sounds an alarm if the pack voltage gets below a safe
level. This is especially valuable on my glider. If I catch a good thermal,
I could be in the air for over an hour, so a pack that tested good on the
ground could run low during the flight.
Channel Conflict Test!
As a test to make sure no one is flying on your channel, turn on the receiver
only. If the device does not go into lost plane mode then someone else is on
your frequency.
Here is a review of another Emergency Locator Beacon that illustrates its
value (this site is somewhat unreliable)
http://webhome.idirect.com/~arrowmfg...s/elb-revi.htm
For 27mHZ planes like the Aerobird, Firebirds, e-Gull, etc
My Aerobird does not have a conventional receiver that I can connect to. The
electronics and servos are one integrated circuit board. No place to connect
one of the above locators. On the Aerobird I use a key ringer.
www.keyringer.com One of these on the plane and one stays in my pocket. If I
am looking for the plane, I click the one in my hand and the one on the plane
answers:
Every plane I ever own will have some kind of locator and battery monitor from
now on. Of course you only need one. You can move it from plane to plane,
but at $15-30 they are cheap enough you can put one in every plane and forget
it!
For really long range finds, measured in miles, there is the Walston system.
The plane unit is about $150 while the tracking unit is hundreds of dollars.
This is good for clubs, especially sailplane clubs. If your sailplane costs
$2000, a $150 transmitter is worth the cost.
http://www.texastimers.com/helpful_h.../wal_cover.htm
Many pilots don't know about these devices. Now you do!