Author Topic: Mavic 115% Build  (Read 4853 times)

Offline Papajohn88

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Mavic 115% Build
« on: November 30, 2017, 04:41:44 PM »
Here are some photos of my Mavic 115% build.  I scaled it up to make room for an Arducopter 2.8 flight control, 4-in-1 ESC, BR2212 980kv motors, Maxbotics Sonar and RadioLink R12DSM Dual Antenna 12 Channel Mini Receiver and Turnigy 3000mah batteries.  I also added a master power switch on the bottom between the rear feet.  The first flight will be later today weather permitting.  I will be using 8045 folding propellers purchased through Aliexpress.
John Guenther
Anderson, Indiana
U.S.A.

Offline Papajohn88

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Re: Mavic 115% Build
« Reply #1 on: November 30, 2017, 04:45:01 PM »
More Photos
John Guenther
Anderson, Indiana
U.S.A.

Offline Papajohn88

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Re: Mavic 115% Build
« Reply #2 on: November 30, 2017, 04:46:04 PM »
More Photos
John Guenther
Anderson, Indiana
U.S.A.

Offline iRazoR

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Re: Mavic 115% Build
« Reply #3 on: December 01, 2017, 11:17:16 AM »
Nice Idea with the Powerswitch on the Bottom! I was also thinking to add one somewhere so I will probably "steal" your idea :)

EDIT: What kind of Sonar Sensor did you use?

EDIT2: Forget it, I read your first post now ;)

EDIT3: OK now Im curious: What Firmware do you use to support the Maxbotics Sonar? Looks very interesting even due it is a bit expensive...
« Last Edit: December 01, 2017, 11:20:03 AM by iRazoR »
- David

Offline Papajohn88

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Re: Mavic 115% Build
« Reply #4 on: December 01, 2017, 11:41:31 AM »
I am using an APM 2.8 flight control with Arducopter 3.2.1 which is the latest version the APM 2.8 will run. Support for the Maxbotics sonar is included in Arducopter 3.2.1. 
John Guenther
Anderson, Indiana
U.S.A.

Offline Papajohn88

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Re: Mavic 115% Build
« Reply #5 on: December 02, 2017, 12:53:33 AM »
Well I made my first flight on the Mavic Clone today, I must have some configuration issues since it did not go very well.  I had a hard sideways landing, broke the left front arm.  I have a replacement printing now.  I plan on starting completely over on the APM condiguraton, going all the way back to flashing the firmware again just to be sure.  I wants to move to the left quickly after liftoff.  I hope to have better luck tomorrow.  I am also not too sure the GPS is working very well.  I do not have telemetry on this one yet, waiting for the telemetry transmitter to show up.
John Guenther
Anderson, Indiana
U.S.A.

Offline iRazoR

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Re: Mavic 115% Build
« Reply #6 on: December 03, 2017, 11:58:58 AM »
The last time I has this problem I had the back motors switched so the onboard Sensor wanted to level the copter but increase the speed of the wrong motor.
Check your motor order and direction again.
- David

Offline Papajohn88

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Re: Mavic 115% Build
« Reply #7 on: December 03, 2017, 02:53:20 PM »
iRazoR,
Thanks for the tip, I will be going through everything today.  I think I may have forgotten to calibrate the 4-in-1 ESC.  I had a little better luck with it yesterday, then it wobbled some and I lost control of it.  I ended up in a corn field next to the club flying field.  Broke the right rear arm so last night was print and install the replacement arm.  I will let you know how it goes today.
John Guenther
Anderson, Indiana
U.S.A.

Offline iRazoR

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Re: Mavic 115% Build
« Reply #8 on: December 03, 2017, 08:03:26 PM »
I can only tell you what others told me... Keep on trying and don't give up  :)

At the last crash I lost the whole drone and before a couple of arms. Is frustrating but the result when it is flying is amazing.
++ I learned a lot during he whole process and while I was asking questions like an idiot at the beginning I'm now able to help others with the same problems. That is great
- David

Offline Papajohn88

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Re: Mavic 115% Build
« Reply #9 on: December 04, 2017, 12:31:13 AM »
I crashed it again today, broke both rear arms and tore the left rear corner of the base off.  So I will be printing two new rear arms and a new base.  I am running 8045 folding prepellers on br2212 980kv motors.  It seemed to loose its mind again today, took off to the right tail first and crashed tail first.  I could do nothing with it, even the "oh s***" which is setup to rtl and land did not help.  I am wondering if not having the APM 2.8 flight controller shock mounted is causing it to get confused.  I looked at the log files from today and did not see anything obvious that would have caused the crash.  Now I am thinking about either an SP Racing F3 Deluxe flight control or my NAZA-M v1 flight control.  I am going to put all of the electronics into an F450 Flame Wheel frame I have and try to fly it to see what is going on.  I am going to mount the APM 2.8 the same way as I had it in the Mavic, on foam tape.

I am not planning on giving up, I want this MAVIC to fly.  I have asked for a 3DR Pixhawk Mini for Christmas, hope I get it.
John Guenther
Anderson, Indiana
U.S.A.

Offline iRazoR

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Re: Mavic 115% Build
« Reply #10 on: December 04, 2017, 08:19:26 AM »
Unfortunatelly I cannot say something about the APM because I have the SP Racing F3 Deluxe and that is my one and only FC until now.
When I had the first Test Flights my Drone was also very unstable until I crashed it completely. After I put it together and looked a bit deeper into the Firmware I recognized that I didnt enable Horizon Mode. That means I was flying Acro (no self-levelling). Maybe you have something similar?
- David

Offline Papajohn88

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Re: Mavic 115% Build
« Reply #11 on: December 04, 2017, 10:36:38 AM »
iRazoR,
That is possible, I am reasonably sure it was in Stabilize mode which is about the same thing as Horizon mode I think,  I am also thinking it may have something to do with where the 4-in-1 ESC is mounted.  The ESC is mounted vertically on the right side of the body.  It may causing severe RFI interference with the processor in the APM 2.8.   Since I have about 18 hours of printing ahead of me to replace the broken parts I am going to put all of the electronics in an F450 frame and to see if I can figure out what is causing the problems.  I am also thinking about using arms that allow mounting individual ESC's in the arms closer to each motor to prevent any RFI problems with the FC.
John Guenther
Anderson, Indiana
U.S.A.

Offline iRazoR

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Re: Mavic 115% Build
« Reply #12 on: December 04, 2017, 11:05:00 AM »
What kind Sensors are involved in Stabilize Mode? Im not an expert but as far as I know RFI Inteferences do only cause problems when you also use a Compass for Stabilization and the Compass is mounted to close to Cables or the ESC itself. Does the APM 2.8 has an onboard Compass?
- David

Offline Papajohn88

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Re: Mavic 115% Build
« Reply #13 on: December 04, 2017, 12:44:33 PM »
Stabilize mode automatically levels the quad copter and maintains the heading.  I read  your build diary, from your photos I am using the same ESC you show in the photos.  I am going to be looking at arranging my ESC and flight control differently now that I have read your build diary and looked at your photos.  I may switch over to the F3 flight control or perhaps the NAZA-M.  The APM 2.8 is somewhat larger than either of them and very difficult to fit into the Mavic. 
John Guenther
Anderson, Indiana
U.S.A.

Offline KDan

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Re: Mavic 115% Build
« Reply #14 on: December 04, 2017, 12:45:47 PM »
Stabilize mode uses the accelerometers. They need to be setup and tied to a transmitter switch in Mission Planner (or whatever configuration software you are using). Double check everything in Mission Planner and make sure all the sensors are working and displaying the correct information on-screen as you move the copter around. Make sure you do the accelerometer calibration.
You should be able to fly just fine in Acro (gyro) mode without accelerometer calibration (assuming you are used to flying without self-leveling)
It sounds like you already looked at the log files. That can sometimes be helpful when you have an intermittent problem. Look at the sensor data closely for sudden instantaneous changes. Vibration isolation for the flight controller is always a good idea. However, unless you have a lot of vibration (badly balanced props) it will typically work OK without isolation mounts.
I find that arming the copter and then holding it firmly in your hand (make sure you are clear of the props) and then slowly increasing throttle to slightly below a hover power level can be helpful. Move the quad around by hand and see if the flight controller makes the copter fight your movements and tries to keep it in position. This can't be done in safely in an altitude hold mode because you don't have direct control of the throttle. Also, be prepared to shut it down quickly if it responds in an unpredictable way. It should always be fighting to maintain the current orientation (or level if in stabilize mode). Keep a firm hold on it in case you have a problem with a positive feedback or other unstable condition. This approach can be dangerous if you aren't prepared to hang onto it. Smaller props or fewer battery cells can help tame it and still give you the feedback you are looking for without risking a crash.
It's possible you have a bad Pixhawk. Not real common though. The Naze32 type boards are not quite as sophisticated as the Pixhawk and are not really better or more reliable in my experience. I've flown everything from the original MultiWii, Naze32/Flip32 variants (like the F3), OpenPilot, Ardupilot and Pixhawk boards.
« Last Edit: December 04, 2017, 01:37:16 PM by KDan »
-Greg