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3DR X4 with inverted Motors

Posted by UAS_Pilot on May 13, 2014 at 2:00pm

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

3dr, inverted, motor, pixhawk, quad, x4

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Comments

UAS_Pilot May 15, 2014 at 3:44pm

With motors on the top or bottom, the props can hit. But even though, I'm glad im not a beginner. Been flying R/C for 23 years. Even with that. Sh*t happens right?
Pedals2Paddles May 15, 2014 at 1:33pm

The only negative I can ever think of for inverted motors is one that beginners might want to keep in mind. One of the most common issues is tipping over on takeoff or landing. With the motors above, when you tip over, the arms hit the ground. With inverted motors, the motors hit the ground.
Mago May 15, 2014 at 12:15pm

Yes, it's roughly the same reasons spoken here (less vibrations, more efficient flow) and also others, like possibility to remove motor bell (C-clip or screw removed) when stored.
UAS_Pilot May 15, 2014 at 5:59am

Very cool. Do they say what their reason for the inverted motors?
Mago May 15, 2014 at 12:53am

FIY, look at this:

http://www.italdron.com/scrabble4.php

This thing is around here in Italy since three or four years... i think those guys got the idea well before these days ;)
Developer

Bill Bonney May 14, 2014 at 11:26pm

There was an issue with Compassmot returning NaN on Pixhawk. That said, with an ext mag, its not so much of a worry anymore. i haven't used compassmot since i have raised the mag far away from the PDB and haven't noticed a toilet bowling effect you get with compass interference.
Pedals2Paddles May 14, 2014 at 6:52pm

I strongly suggest doing the compassmot procedure anyway, even if it doesn't seem to need it. It should be done outside too. You might be surprised how much it is is able to compensate for and improve.
UAS_Pilot May 14, 2014 at 3:48pm

I saw this video already. Your test did not look very scientific nor in a controlled environment.

So, thanks for the information, however i am going to leave it alone. It flies good and I like it.

I am not shooting for high endurance or anything. So I thank you for all the kind words and suggestions.
Quadrocopter May 14, 2014 at 3:33pm

Check this Joseph and the link :-)

https://vimeo.com/84825842

Simon
UAS_Pilot May 14, 2014 at 11:54am

Roger that. I found in the APM Forum that this is a comon issue with the Pixhawk and Compass Mot. I reset the compass mot data to 0 where the nAn is on the compass reading and all went back to normal.