France, IdF, Châtenay-Malabry
Joined Aug 2010
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.
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