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Deep Reaper flying wing

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Re: Deep Reaper flying wing

Postby scanman » Tue Aug 28, 2012 12:29 pm

One minutes silence please..............
Sorrry johan.
did Dan tell you my idea of making a directional receiver which you slip over your RC transmitter that limits the radio signal to only one direction. You then use the telemetry from your plane's receiver (which hopefully its still sending?) and rotate your transmitter and Yagi directional antenna until the telemetry signal is strongest.
Then walk in that direction till you get to the closed gate.
Then launch Danz Quad to go take a peek over the gate.

We were just discussing a recovery quad with a small winch with treble hooks and downward facing second FPV for exactly this scenario.
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Re: Deep Reaper flying wing

Postby robone » Tue Aug 28, 2012 1:05 pm

A lot of the more expensive systems send out the GPS location as part of the data, as long as the battery is connected.

A bit more accurate than using triangulation :) and in the long run, probably cheaper....because you will get all your equipment back
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Re: Deep Reaper flying wing

Postby scanman » Tue Aug 28, 2012 1:15 pm

the directional antenna is for the case when the gps data is not available, as in your current situation!
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Re: Deep Reaper flying wing

Postby DanZ » Tue Aug 28, 2012 1:23 pm

Johan was relying on the pretty much the same method many other FPV'ers use and that is to use the GPS information from the OSD, but that for whatever reason it was corrupted :(
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Re: Deep Reaper flying wing

Postby robone » Tue Aug 28, 2012 1:31 pm

DanZ wrote:Johan was relying on the pretty much the same method many other FPV'ers use and that is to use the GPS information from the OSD, but that for whatever reason it was corrupted :(


Maybe I should have read these posts from the beginning!!
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Re: Deep Reaper flying wing

Postby scanman » Tue Aug 28, 2012 1:48 pm

these two links below combined might work linking a GPS to a sim card, but Im always more interested in simpler solutions involving less points of failure. e.g. if you are relying on a plane recovery using a GPS that has been logging its data to the internet over a cellular network, its quite possible that it cannot log all of its information all the time, so in the 2 seconds of your crash, it might not log data. it might crash in an area where there is no cell phone reception and so stop logging info. If your Receiver has got telemetry enabled , and its a proven technology that you are using anyway to transmit telemetry while flying, it makes sense to just use your existing system for another purpose.

The yagi antenna doesn't use trianglulation, it uses a narrow beam. You could in theory get within a few meters of the downed plane using the yagi and then if you have an audible lost finder alarm that beeps when there is no stick input (R40 on ebay) you could then let your ears take over.
We got accuracy of less than a degree with a 5 pole yagi running at 150mHz, so at the shorter wavelength of 2.4 GHz you should in theory get even closer.

They use Yagis for finding lost eagles in falconry and still use them for tracking cheetahs even with the GPS units.


http://www.rfdesign.co.za/pages/5645456 ... odules.asp
http://www.rfdesign.co.za/pages/5645456 ... Boards.asp
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Re: Deep Reaper flying wing

Postby JohanMoelich » Tue Aug 28, 2012 2:17 pm

Keep in mind that if the crash was bad enough to dislodge the flight batteries, the RC Rx won't be transmitting any telemetry data and the directional tracking won't be possible. I doubt that there was still power to the Rx after it hit the driveway at that speed. Batteries are heavy and probably would have been ripped out of the wing, and the servo leads leading to the Rx on the wingtip was probably ripped out as well.
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Re: Deep Reaper flying wing

Postby scanman » Tue Aug 28, 2012 3:17 pm

probably a GPS/GSM module wouldnt survive either, unless we have multiple redundant batteries.
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Re: Deep Reaper flying wing

Postby GarethRens » Tue Aug 28, 2012 3:23 pm

Perhaps I should put together a cheap wifi gps tracker for you guys?
http://www.stuffinc.co.za
We sell all kinds of stuff, including multi-rotor UAV/Drones :ugeek:
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