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Why is my quadcopter toppling when i try to fly it? Answered

I built a quad copter. I have done all the calibrations correctly (accel, compass, rc, esc). When I arm the drone, motors and propellers are spinning. But when i give more throttle to try to hover it, it doesnt fly upward steadily. Instead it lifts backwards and falls. Why is this happening? Should I change some PID setting?

Discussions

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Downunder35m

3 years ago

And we would know the answer based on what information?
My plasma reactor does not work properly, can you tell my why?

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robobot3112

3 years ago

There are too many factors affecting that, Please be more specific

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It could be the wires hooked up to the motors. If they don't have a good connection then it may topple. If it is like that try soldering them back to the terminals. Also it may be that your power supply is not big enough and the current is not getting fully through to that certain motor causing it to topple.

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-max-

3 years ago

Unfortunately the question is way too vague for a specific answer. You will just need to research all the things that can cause such behaviors and go through one by one and see and eliminate pontenial problems. In addition to what rickharris said, it could be some stupidly simple like one propeller mounted backwards or on the wrong motor, or maybe the flight controller is mounted improperly. It could even be vibration, or a motor wired backwards, ESCs connected to the wrong pins of the flight FC, the PID settings of the flight FC, of other possible settings on the flight FC.

When systematically checking over the entire build, I recommend checking the simple things first, and working your way up to testing the more complicated mistakes that would cause such behavior.

When I reassembled my quadcopter, I accidentally mounted the flight controller 90 degrees off axis, and the quad basically did a break-dance when given throttle!!! It destroyed my propellers, but it was hilarious! It took me awhile to realize what I did wrong, but in the end I noticed the little arrow on the flight FC was pointing sideways instead of forward! I made a simalar mistake later on when I changed to a different frame, and the flight controller could only be mounted sideways. There was a setting in the source code that configures which way is "forward," whether it is off by +45 or -45 degrees. Of couse murphy got me and even when paying close attention I still managed to enable the wrong compensation. Luckily I immediatly reconized that setting was the culprit, as well as the connections to the ESCs.

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prash319-max-

Answer 3 years ago

My quadcopter symbol is 'plus'. I have mounted the motors according to the picture on the ardupilot website. Right - motor1, left - motor2, front - motor3, back motor4. During the motor test on mission planner, the motors dont spin in the order as given the ardupilot site.

"The first motor to spin will be the one located directly forward in the case of + configuration. The motor test will then proceed in a clockwise rotation".

For me, the first motor to spin is the one on the right (motor1). Then motor test proceeds in the anti clockwise direction.

Do you think this might be an issue?

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-max-prash319

Answer 3 years ago

Yes. It sounds like you have your left and right motor channels mixed up. The default PIDs are generally more than good enough for getting lift, you really only need to touch those if you are into getting it either super stable or into hardcore acro / racing type stuff, or if you built something very different.

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prash319-max-

Answer 3 years ago

i have a feeling that one motor is rotating at a lesser RPM compared to the others. How do I check the RPM of each motor? I know a laser tachometer can be used but i don't have one. Can I get this information from Mission Planner?

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prash319-max-

Answer 3 years ago

Thanks. As far as i know everything seems to be fine. I will check everything again. About the PID settings, I have default settings now. I need to change them. But with the default settings it should fly at least a little bit. Do i need to adjust the PIDs? I will check the basics anyway.

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-max-prash319

Answer 3 years ago

Keep the defaults for now. As a matter of fact, go ahead and reset them to stock settings. Painless360, RCmodelreviews, and flitetest are some of the best youtube channels for RC models.

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petercd

3 years ago

Are the props correct, 2 cw and 2 ccw?

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rickharris

3 years ago

Motor turning wrong way

props wrong 2 cw 2 Acw

ESC not set up correctly

Flight controller not set up right

Poor piloting

poor construction

transmitter not set up

See

http://www.flitetest.com/

Lots of help there