Quadcopter spins on take off

K

kookoocachoo

Member
I just finished my quad and on my first test flight it just spun cw. It'll go up though if I give more throttle, but it just spins. I adjusted the roll trim and that just messed it up more, so I adjusted it back. Then I tried the yaw trim and it just made it spin in the opposite direction. I got to one yaw trim spot where it would randomly switch from spinning cw and ccw. One motor (motor 4) I noticed starts and arms a bit slower then the other three. I calibrated them all individually.
This is me adjusting the yaw and having it just switch cw to ccw:

This is brighter so you can see motor 4 and hear how it spins and arms after the others:
 
Could be wrong, but it sure looks like your props are on wrong. High side of prop should be the leading edge
 

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Looks like both motor rotation and props are wrong.

Syma_props_complete__.jpg
 
Having it opposite from the picture you showed wouldn't affect the flight at all though, right? So from the motor numbers in the picture I posted instead of motor 1 and 4 being cw they're ccw. And motor 2 and 3 are cw. That works, I would think.
 
After our input and your obvious ignorance, I can only suggest that you flip it upside down and use it as a mini lawnmower. Because that's all it'll ever be. Have a nice day
 
My apologies if I seemed a bit ignorant. I didn't understand that the yaw would be off if I had the rotations reversed. I have switched all the directions to the correct layout. The quad is not spining anymore but, after rotating the motors due to the cw and ccw threads and nuts, the same ESC is arming and spinning the motor slightly after the other 3. And as a result the quad just flips due to one motor not having as much thrust, I would think. Only thing I can think of is to just replace the esc. Any ideas?
 
There is a thing called Throttle Deadzone, that might be your problem. Due to ESC differences, you might have some variation motors responding to low throttle settings. I can set this value on my APM using Mission Planner - I can connect remotely to my aircraft and test each motor individually to see what setting it takes to get each motor to start spinning and then I can use that to set the throttle dead zone value. You might first want to do an ESC calibration if you haven't already done so.
 
Hi mate the FCB has a front and this must point to the front . Now the FCB needs the motors in the right places as it will adjust these it fly so if the motors are not on the right arms spinning the right way it will find it hard to fly
Also when you have a problem we look at the photos and can see they are wrong to us just makes it harder to help if not set as normal
 
So after replacing the bad ESC, the same thing happens. I don't think its the fc, because I switched the ESC plugs in the naze board, and the same ESC makes the same motor start after the others. I measured the rpm at minimum throttle, and motors 1 and 4 read about 7,500. But as I left the throttle still, motors 3 and 2 started to speed up, all the way to 12,000 rpm. I'm clueless as to what the problem is. Could it be the 4 linear becs I left in? I heard yes and no for linear type, so I just left em all in.
 
If you leave motors throttled with no props on they will always continue to increase in RPM. Hard to explain but the PWM loop signal gets messed up. It's normal. Sounds like you might need to recalibrate your ESCs again
 
Hey there, I have built both my drones with Arduino Boards, I had the same problem once, Tho i'm not sure if you're using arduino, But some of the below could be your problem.
- Check your Propellers, The first one should be CW, Second, CCW, Third CCW and the forth CW.
- Check your Pins, Check if you haven't connected the wrong pins.
- Check your Trims, See if you haven't accidently messed up the YAW trim.
These were the three different issues I myself have experieneced, Hope they help.
 
I have checked my propellers. I'm pretty darn sure all the wiring is right. But By trims you're reffering to the ones on the transmitter, correct? Because I centered those last try at a takeoff. Or is it something I gotta go in say cleanflight to check?
 
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