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  • The process of elimination to the root cause can also be a bad battery that goes low in voltage with a current drain yet shows a good float voltage when not used. I know that if the battery is drained it tips the copter if I try to use it again. Make sure the level routine is done properly with trims neutral.

  • One thing I do before trying lift off is to throttle up on the ground just to the point where I can move the quad, but not enough to lift off.  Then nudge all my sticks to see if they move the quad in the direction that I want it to.  


    Chris is right.  The APM is oriented for +, so you MUST use + mode.

  • 3D Robotics

    His APM is oriented for + (facing an arm), too. So it should set for + mode. I'd guess that the motors are connected in the wrong order.

  • After looking at your video the quad is attempting to "roll".

    I had this same issue and found that the quad was set for X rather than + .  Your quad has red tape on only one arm which implies a + configuration and it may be configured for X but may be trying to fly in the + mode.

    Try clearing your configuration and do a config from the very beginning.

  • 3D Robotics

    Also: run the "Motors" test in the CLI, which will tell you if you've hooked up your PDB right:


  • Check your radio pitch trimming.  Make sure everything's in the middle and calibrate the radio.  Either that or the motors are not turning in the right directions or the props are on wrong.  Put up a slower shot of the motors moving, and a still shot of the props, so we can see better.  (Oragne arm should be CW, and the other arm should be CCW)

  • Ethan: ok. I will try that. Thanks.

  • Adli Shahanza:

    I had an issue very similar with my quad at first. Triple-check the correct wiring on the power distribution board. Make sure you have the orange and white signal wires going to the ESCs in the proper order (front, back, left and right). I'm fairly certain that's what the problem is.

  • Randy: Already try both of it (+/x mode). Still the same.

  • Developer

    My bet after not thinking about it very much is that you have it in X mode instead of Plus mode.  You can change this in the CLI using the setup, frame command.

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Drone flying to non visible point

Hi there,I encountered a problem, while flying in auto mode, with approching to point that was not set by trajectory and is not visible after downloading mission from flight controller by Mission Planner. Does anybody encountered similar problem. The situation is that in the middle flight I stopped the UAV and uploaded new mission and after changing to auto mode it starts to fly in some direction. It goes straight to some point, so I assume it's not mechanical problem. I attached the link to…

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Hi,Im working on a autonomous drones and im using JETSON NANO and flight controller PIXHAWK .Im able to control my drone by giving rc commands on the MAVLINK terminal itself by connecting it with PIXHAWK but now i want a python code from which i can do some operations like:takeoff,left ,right,forward,backward…and i am not using GPS…Can anyone please help me…

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1 Reply · Reply by tellinglean Oct 17, 2022

HELP quadcopter: one motor twitching and stuttering

Hello guys,I have a problem with one motor, do not spin and making a sound (videos in attachment), I changed the motor to another ESC and is work, so I checked the connections on ESC and all connections looking great. any ideas or something I can do, iam trying to build YMFC32 Brokking .thank youhttps://youtu.be/LagBqwGbixkhttps://youtu.be/PU20nCxApcs

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Will AHRS_ORIENTATION=8 for Arducopter 3.2.1 on APM 2.5 using a traditional Heli

I have been Reading Chris Olsen posts and watching his videos on Arducopter with traditional Helis using a Pixhawk.I have inherited an older Trex 450 heli with the old Align 3G FBL hardware.  The FBL controller appears to be bad.  So I have an old APM 2.5 without a compass or GPS on board.  I just want to replace the failed Align 3G FBL system with the APM.Now I have to mount the APM under the skids on the heli so the APM will be upside down.I have Two questions.1)  Is the AHRS_ORIENTATION=8…

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