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Old 07-02-2013, 05:17 PM   #11
Thunder Chicken
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Re: Make a model ELT

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Here's something interesting..............
It's set up to 'wake-up' your device when its bumped. If it could be reset to higher forces than a 'bump' this may be a neat part to use
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Old 07-02-2013, 07:03 PM   #12
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Re: Make a model ELT

This is all you need, an RF directional locator.

Originally Posted by Thunder Chicken View Post
So after loosing a plane in the bush over the weekend and searching for a beacon of some sort to help find it, I'd like to think about building something. A simple ELT for models, that has its own power source, triggered by a crash, not an extra channel or low voltage, with just a tone.

Full scale aircraft have an ELT. (emergency locator transmitter). It senses a crash, and transmits a tone on a certian frequency so other radio rx;s can hear it and home to it. (also satellites). They also have a speaker and emit the sirin noise for all within ear shot to hear.

With small electronics in cell phones, can one buy the accelerometer portion, have it set to trigger a small speaker at a certian g force, all powered by something simple like a 9v battery, or a couple of AA's. (with an on/off switch) This may not be the smallest device, but a .40 sized plane or larger could handle it with ease.

I've seen the beepers that HK sells. None would have worked for aircraft battery pack pooched during flight. Even nicer would be some sort of GPS tracker to use with a phone app.....but that seems to complicated/expensive. Plus, I dont have a fancy cell phone or good cell service at our flying site.

I found a few diagrams of guys building g force meters to use in thier race cars etc. Something like that, set to make the tone go off, with its own power source would be ideal.
It may activate if you have a hard landing or do crazy aerobatics but it could be easily reset after landing.
Any electronics gurus want to comment?
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Old 04-17-2014, 06:42 AM   #13
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Re: Make a model ELT

just a little update....due to life, i've put this idea on the back burner! However, This product may help in the search for a lost model!
The new standard for finding lost models Rugged and powered by its own battery, this ONE OUNCE system doesn't depend on the receiver and battery that probably caused the "fly away". Flip the arming switch and it remains silent for 15 minutes after which it beeps at 65db at 50 feet for up to 4 hours or 4 days with a larger 9V battery. Easy to use, it works with any radio system, even PCMs. Complete with battery."

I'm not too worried about having fly-aways, but in this neck of the woods, they are hard to find. We are surrounded by 1000's of acres of bush, no farm country up here! Better safe than sorry! And cell coverage is not the greatest, so any of these GPS trackers won't work well as they require cell coverage to 'text' you the location. Telemetry would be the best other option I guess.
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Old 04-17-2014, 01:56 PM   #14
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Re: Make a model ELT

another option. GSM locator. Just need to get a SIM card. Very light, like 40-60g. many of them out there like these. Just call on your cell and it send you the GPS coords.

Last edited by bcsaltchucker; 04-17-2014 at 03:13 PM.
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