Just completed the assembly and setup of my new 3DR X4. I am using all 3DR parts including:

  • Pix Hawk
    • GPS/Compass
    • 915 Mhz Tele,
    • 3DR Power Module
  • 3DR 850 Kv 28/30 Motors
  • 3DR Simon. K ESC
  • APC 10 X 4.7 Props
  • FrSky Tx &Rx
  • GCS
    • Nexus 7 running DroidPlanner 2.0

I have completed my first flight using the default X4 Param. It was stable but I wanted it to have a more locked in feeling so I performed the Auto-Tune and all I can say is "WOW", really nice. I have made a mount for a digital camera to be mounted to the bottom for Ortho-mapping small areas. I use a Canon Elf 115 with CHDK for USB remote triggering by the PixHawk. Works great....

The DIY frame kit is excellent. It even included locktite. Great quality and it goes together nicely.

Thanks 3DR for such a great product....

Joe Millette 

Views: 4487

Comment by hotelzululima on May 13, 2014 at 4:39pm

so explain at length about the inverted motors?


Comment by Quadrocopter on May 13, 2014 at 5:46pm

It's roughly 10% less efficient now.

How's that for an explanation ;-)


Comment by UAS_Pilot on May 13, 2014 at 6:37pm

why do you say its less efficient? I test flew it today with no noticeable loss of flight time.

I was able to get a 20 min flight time with a 5000mah 4s.

Comment by Craig Bussel on May 13, 2014 at 6:43pm

you going to add 4 more motors eventually, X8 is a great way to go. As for as the compass issue you are having, have not had any problems myself, hit up tech support, there are also videos on the 3DR youtube on compass call.

Comment by UAS_Pilot on May 13, 2014 at 6:47pm

The biggest reason for inverted motors on a quad is vibration. If you have ever heard the load noise from a flying wing when the prop is spinning. that is the "thump" of the prop over the boom. This set up omits that and creates a smooth sounding copter. It also prevents vibration from entering the frame. Regarding efficiency i did not notice any change.

Comment by Rana on May 13, 2014 at 6:52pm

Comment by UAS_Pilot on May 13, 2014 at 7:03pm

After flying it today loiter is rock solid without completing the compass mot. so as the saying goes "if it ain't broken don't fix it." I might add the other four down the road but for now it seems good... 

Comment by Crady von Pawlak on May 14, 2014 at 12:00am

Nice!  Pushing into clean air makes so much more sense.  The next time I tear down my Tarot frame I plan to invert the motors. 

Comment by Hugues on May 14, 2014 at 12:08am

Nice build. I like your tablet holder. Did you 3d printed it or bought it?

Just to make sure, replace all of the NAN values you might have got during your compassmot procedures by zeros (check in full parameters list in mission planner)

Comment by Robert Lorenzo on May 14, 2014 at 12:33am
I ordered an x4, hopefully will be here in a couple days. Does it have default parameters in mission planner like iris? Or do I have to tune the pids myself? If it has to be done by me, can anyone point a noob to a manual on how to tune them? Thank you.


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