Hexacopter Won't Take Off - No THR_MAX Setting in MP

I finished building my hexacopter and on my test flight it wouldn't take off. It was right at the cusp of flight, but wouldn't get completely off the ground. I've searched around the web and everyone mentions checking THR_MAX parameter in MP. So, I've checked there and no THR_MAX parameter is listed in any of the sections.

I've attached a screenshot of the full parameter tree drilled down into the THR section and you can see there is no THR_MAX setting.

Since I'm still fairly new and this is my first DIY, I assume I did something wrong in the setup to cause this setting to be missing, but I used the wizard with Hexacopter in X configuration and did all the calibrations (minus the ESC calibration because I'm using DJI ESC/motors). Is the setting possibly missing because I didn't do the ESC calibration, or is it something else I messed up/overlooked?

no_thr_max.png

You need to be a member of diydrones to add comments!

Join diydrones

Email me when people reply –

Replies

  • Very old thread I should have responded to once I found a fix. I simply switched from using MP to using APM and the initial configuration worked right away. I couldn't begin to tell you why MP didn't work after numerous times following the directions, but once I tried using APM instead of MP it worked immediately. Hope that helps.
  • Hi Brad, If you haven't messed with the THR_MAX value then leave it alone for now.

    Aside from the prop size and the fact your ESCs are from DJI you haven't given us much info. so we're kind of working in the dark (knowing your all-up weight, the size of the motors, battery size, etc. are all important.)  That said, there are any number of possibilities as to why your copter won't lift off so this will be a process of elimination.  To begin you'll need to verify the following:

    • Each motor is connected to the correct channel (verify via the Mission Planner motor test) 
    • Each motor is rotating in the correct direction
    • Props are mounted face-up and correctly oriented
    • Transmitter calibration has been successfully completed 
    • Accelerometer/gyro calibration has been successfully completed 
    • Battery is fully charged and the correct capacity for your setup
    • ESCs are in sync

    Now would also be an ideal time to thoroughly go through the Arducopter documentation, especially the checklists on these pages:

    http://ardupilot.org/copter/docs/configuring-hardware.html

    http://ardupilot.org/copter/docs/flying-arducopter.html

    Hope that helps!

    Mandatory Hardware Configuration — Copter documentation
  • Did you solve your problem I got the same problem

  • Bump, hoping someone sees this. 3dr says pixhawk is supported. Can I call them somewhere for help on this? All their links for support point here. Don't mean to bug yall, just wanna get this figured out, since everyone else seems to have a THR_MAX. Should I drop firmware to 3.2?
  • many times this because you either have the motors wired wrong or the props on wrong.

    Starting front left the motor should spin to the right and the prop should be a "R" prop. then going clockwise the next motor should be spinning left with a non "R" prop and then R and then L ect.

    also make sure your props have the lettering on the top.

    Next issue is the wiring, Again starting with the front left motor it should go to the pin labeled 3 on the hawk. and again going clockwise around it should be

    3.5.1.4.6.2

     

    • Thanks for the reply. I have confirmed using your numbers and the diagrams here that I have the wiring done correctly: http://copter.ardupilot.com/wiki/connect-escs-and-motors/#hexa_octo_y6

      I am using DJI 9450 props that can only screw on one way. They're labeled 9450cw on black tops which I put on the CW motor. The silver tops are labeled just 9450 and I put those on the CCW motors. The CW/CCW motors and props align with the aforementioned diagram.

      The only remaining thing I can find to check is the THR_MAX parameter, which is missing from Mission Planner for me, as shown in the attached screenshot in the original post. 

This reply was deleted.

Activity

DIY Robocars via Twitter
yesterday
DIY Robocars via Twitter
RT @SahikaGenc: AWS DeepRacer & Hot Wheels Track https://youtu.be/4H0Ei07RdR4 via @YouTube
Sep 14
DIY Robocars via Twitter
Sep 8
DIY Robocars via Twitter
RT @davsca1: We are releasing the code of our Fisher Information Field, the first dedicated map for perception-aware planning that is >10x…
Sep 8
DIY Robocars via Twitter
RT @SmallpixelCar: How this works: 1)object detection to find cones in single camera image, 30 frames/sec on @NVIDIAEmbedded Xavier. 2)comp…
Sep 8
DIY Robocars via Twitter
RT @SmallpixelCar: Use two color cones to guide the robocar. No map needed, on onsite training needed. Just place the cones and it will fol…
Sep 7
DIY Robocars via Twitter
Sep 7
DIY Robocars via Twitter
RT @roboton_io: Great to see http://roboton.io running at 60fps on the cheapest #chromebook we could find! #edtech #robotics #educat…
Sep 3
DIY Robocars via Twitter
RT @openmvcam: Crazy in-depth article about using the OpenMV Cam for Astrophotography: https://github.com/frank26080115/OpemMV-Astrophotography-Gear https://t.co/BPoK9QDEwS
Sep 3
DIY Robocars via Twitter
RT @openmvcam: Hi folks, it's finally here! Our first draft of our Arduino Interface Library is out! It works over SoftwareSerial, Hardware…
Sep 3
DIY Robocars via Twitter
RT @chr1sa: Please let them have an open API. This would be perfect for @DIYRobocars races https://twitter.com/NintendoAmerica/status/1301513099707658246
Sep 3
DIY Robocars via Twitter
RT @SmallpixelCar: Lanenet pretty much used all my GPU power on @NVIDIAEmbedded Xavier since I optimized with tensorRT. I need to run anoth…
Sep 3
DIY Robocars via Twitter
RT @LyftLevel5: Our @kaggle competition on Motion Prediction for Autonomous Vehicles is now live! Experiment with the largest-ever self-dri…
Aug 24
DIY Robocars via Twitter
RT @chr1sa: Our next @DIYRobocars virtual AI car race will be on Sept 26th. Sign up here https://www.meetup.com/DIYRobocars/events/272786977/ https://t.co/UENKGSOWO8
Aug 24
DIY Robocars via Twitter
New ready-to-run @NVIDIAEmbedded JetRacer car from Waveshare. Perfect for the next @diyrobocars race as soon as we… https://twitter.com/i/web/status/1297960223013867520
Aug 24
DIY Drones via Twitter
RT @chr1sa: The US government just approved 5 US-made drones for purchase, all based on the @Dronecode @PX4Autopilot standard. Great news f…
Aug 20
More…