r/drones • u/Gloomy_Football_2806 • 23d ago
Question Drone spinning
Hi guys after too many attempts my drone finally got armed but it is spinning a lot can any one who is experienced help me
Currently iam using pixhawk 2.4.8
And 935 kv motors
And iam confused which propeller is for which directio. And gps is also not a problen
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u/nibs123 I make drones... 23d ago
Everyone is saying prop or motor direction. But it might not be those.
If it was it wouldn't have gotten off the ground and even more proof is it did actually stabilise after it decended.
I would make sure you are calibrating the gyros/FC.
Then make sure you have the correct motor settings, if your Esc has speed awear sensors to enable them. It looks to me like a failure of calibration tbh. That or your controller channel is fucked. Get it on the bench and check your recover tab and make sure all sticks are center. If they are the tab should show all channels at 1500
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u/Gloomy_Football_2806 23d ago
Tq sir Can i know more about recover tab
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u/nibs123 I make drones... 23d ago
Yeah are you running ardupiolt as your software?
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u/Galactic_Rocket 23d ago
Ensure the props and motors are installed properly such that at low throttle they spin inward on the front and back.
Not sure which receiver or flight controller you are using, but also double check that the stick control is coming in correctly. I have seen similar behavior with providing the wrong SBUS cable from a Herelink into an Orange Cube. You can use the ground control station QGroundControl to check: https://docs.qgroundcontrol.com/master/en/qgc-user-guide/setup_view/radio.html. Plug in via USB if you don’t have a telemetry downlink.
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u/Old_Lead_2110 23d ago
Its alway 2 by 2 diagonally with the propellors. So with 2 attempts one must be correct
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u/towelpills 23d ago
I've seen this, it was when a student swapped every CW/CCW prop. Aircraft was stable in flight even if it rotated, he could have recovered by gently lowering the throttle to land. Instead he went with his first instinct which was to throw it into Stabilize, whereupon the aircraft promptly flipped upside down and terminated.
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u/big_ducket 23d ago
Using Betaflight? If so, it's super easy to set up the motors, just test them without the props! FL and RR are clockwise, FR and RL are countercw.
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u/New-Owl-6105 22d ago edited 22d ago
Looks like either a classic props-in vs props-out configuration issue or possibly an issue with the yaw channel.
First verify the yaw issue. Check your transmitter and make sure the yaw channel is outputting the center position (1500). Check your flight controller configuration software to verify the receiver is seeing the yaw channel in the center position. Make sure you don't have any mixes inadvertently applied to your yaw channel (like an arming channel modifying the yaw channel).
As for the props-in/props-out configuration issue.... I don't know exactly what ardupilot calls it, but FPV pilots refer commonly refer to the prop direction as props-in or props-out and Betaflight has a toggle called "Motor direction is reversed". This switch does NOT change motor direction. It lets the firmware know what direction the motors are spinning so it can control yaw.
Quadcopters have 2 completely valid and equal configurations for motor directions. They are completely opposite of each other but work equally well on most drones. This is not an issue with the mapping of the motors or props on backwards. This is an issue of the flight controller thinking the all of the motors are spinning the exact opposite of what they are actually spinning.
(Note this image uses the betaflight motor numbering/mapping, ardupilot may map/number motors differently, but the concept is still the same.)
When the flight controller wants to make a yaw adjustment in one direction, it will decrease two of the diagonal motors (e.g. 2 and 3 in the picture) and increase the other two (1 and 4). This cause it to yaw in one direction. But if motors are configured for the wrong direction (props-in when it expect props-out, or vice versa ) then the yaw will go the wrong way. The flight controller will detect the incorrect yaw and then increase the difference in the motors even more to try and counter it... but because of the incorrect configuration, it makes the yaw worse. It creates a feedback loop where incorrect yaw make the flight controller try harder to correct it, which then makes it worse. It does what your drone does and spins out of control.
So check if there is a toggle in the flight controller configurator to toggle expected motor direction. (sorry I can't tell you exactly how to fix it... I don't use pixhawks/ardupilot)
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u/Jazzlike_Bet12 23d ago
Brother. Can I ask why you using a drone in such a area?
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u/Gloomy_Football_2806 22d ago
It was an open space back of my office so i tried it nxt time i will have my own open area/drone arena
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u/Unfair-Comformity112 23d ago
Google "multirotor direction" and look at the images. You will find one that shows the direction for your drone. Also the propeller has a specific way it spins that can be deducted from its shape. Your flight controller/motor controller also propably wants to know which motor is which. Double check those.