Graupner MX20 vs Spektrum: how to loose a Multicopter ? - RC Groups
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Aug 01, 2012, 01:50 AM
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Graupner MX20 vs Spektrum: how to loose a Multicopter ?


How to loose a multicopter at 5 km from take off.

My Epic Scarab Reconn who flew over Iguaçu falls (on Spektrum gear) has finally ended by my fault after I setup a new Graupner MX20. I used to fly it on my Spektrum DX8, safely within 700 meters as I was warned by telemetry alarm and could always turn back. I also fly my other Scarabs on Thomas Sherrer LRS.

I thought Thomas Scherrer is a little bit of overkill considering a multicopter autonomy so in an attemp to have only one system, I decided to test the Graupner MX20 who is supposed to have 4 km range!

This was my first time out with my new MX20 and as I decided to fly within 500m to check my first setup, I did not even setup my naza failsafe on RTH. By the way, I new the telemetry would bip before the RC could be out of range.

After about 300 meters I got a telemetry alarm but two seconds later it went on failsafe: hold last command. I could only start recording on my Carbonbird blackbox and watch the images till the end, 5 km away from take off.

Based on the images, I could go on the crash location, I could ear my Emcotec Locating beeper doing S.O.S. beep but based on the residential area, I could not access all gardens to search for the aircraft and decalred it lost after 2 hours of search.


- 900 mhZ / 500 mW from hobby wireless is a very good video gear, it kept the images till the end, 5 km away at an altitude below 100 meters, this with no diversity on the reception, simple stock omni antenna on my hat groundtation. I can sell my patch antenna

- Always setup properly your RTH if you have the option to do so

- Always do range test on ground when you first try a new RC transmitter

- Don't trust manufacturers... Finally my DX7 and DX8 appear to have more range than the latest Graupner HOTT technology!

- I will keep my Thomas Scherre LRS

- I may search for a more efficient locating system.

Graupner MX20 shorter range than expected, crash at 5 km, video downlink still worked (4 min 37 sec)

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Aug 01, 2012, 01:56 AM
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lol, another graupner "sucess". while spooektrum is no angel, this overpriced German stuff that isn't actually made in Germany is just the wurst. get frsky and forget this stuff.

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