Small crash Mavic Pro 2 will not go forward or backwards, help please. I calibrated both controller and drone.

[fsu1991]

Please help! I was following a subject and my drone ran into a flag and dropped to the ground. No visible damage but one prop pin broke where it sits on the spinny thing. Now it won't go forward or backwards. I'm guessing a sensor error. I calibrated both controller and drone, no help. Thoughs?

 

[fsu1991]

Ok, drone hit a flag, dropped to the ground. One of the pins on a prop broke, i replace it but drone will not go forward or back. I calibrated both drone and contoller, no change. Help plz.

 

[Nexus Dragoon]

Check the markings on your props (usually "A" or "B") and match them exactly to the diagram in your manual.

 

[Nexus Dragoon]

fibers or grass can wrap around the motor shaft under the propeller. Even a tiny amount of friction can prevent a motor from reaching the RPM necessary to "pitch" the drone forward.
With the drone off, spin each motor with your finger. Do they all feel equally smooth? If the motor that took the hit feels weird or stops sooner than the others, the shaft might be slightly bent.

 

[Nexus Dragoon]

Also, try sport mode. If it works, then it's the obstacle sensor.

 

[Meta4]

Check the markings on your props (usually "A" or "B") and match them exactly to the diagram in your manual.

If that was his problem, he's be complaining that the drone wouldn't even lift off.

 

[Felix le Chat]

Ok, drone hit a flag, dropped to the ground. One of the pins on a prop broke, i replace it but drone will not go forward or back. I calibrated both drone and contoller, no change. Help plz.

You say it won't "...go forward or back .."

Take the props off. Unfold the legs.

Place the drone on the deck with nothing in close proximity.

Power on drone, connect to controller and flight app.

Move the slider switch on the right side of the controller body down into 'T' mode (Tripod mode switches all of the proximity sensors on).

Put one of your hands within 6 inches of the drone body and slowly move it in a circle around the drone. Watch the screen while you're doing this.

Do you get the coloured bars appearing ('radar' warning) relative to where your hand is? If not - the O/A sensors relative to that direction need attention.

Pitch might be shot, but what about the other attitude controls? Throttle? Yaw? Roll? Does the drone answer stick input in those respects?

 

[Nexus Dragoon]

If that was his problem, he's be complaining that the drone wouldn't even lift off.

No one said the props were definitely the problem, it’s just a possibility that needs to be ruled out before wasting time on involved solutions.

You're right that an inverted prop on a Mavic 2 Pro pushes air up, effectively 'sinking' that corner. But you’re underestimating the redundancy of this flight controller. It’s designed to fight for stability at all costs. If one corner sinks, it instantly redlines the other three motors to lift the dead weight. The Mavic is powerful enough to hover like that, but it 'saturates' the motors, meaning they have zero power left to actually tilt the drone. When the software realises it can't tilt without falling, it locks out your pitch commands as a safety fail-safe.

But honestly, the physics are secondary. To not bother ruling out a reversed prop on a Mavic 2 Pro, where you literally just have to match the white rings on the blades to the white marks on the motors, is incredibly lazy. It takes five seconds to check. If you’re going to spend hours recalibrating sensors and digging into flight logs without first checking if the $10 plastic blades are on the right way, you’re just making life harder than it needs to be.

 

[Meta4]

No one said the props were definitely the problem, it’s just a possibility that needs to be ruled out before wasting time on involved solutions.

It can be immediately ruled out because a drone cannot launch with props on the wrong motors.
End of story
I'm surprised that someone who knows everything about drones doesn't understand this.
But as you suggested that cell voltage differences caused a drone to drift instaed of holding position, I shouldn't be surprised.

 

[Nexus Dragoon]

It can be immediately ruled out because a drone cannot launch with props on the wrong motors.
End of story
I'm surprised that someone who knows everything about drones doesn't understand this.
But as you suggested that cell voltage differences caused a drone to drift instaed of holding position, I shouldn't be surprised.

Not all drones work like that; sure, cheap budget toys might. It’s not even about whether this specific drone would act this way, it’s about the fact that if you replace a prop and immediately encounter a new issue, and you don’t even bother to check the install because you think you know everything, you’ve just done the most 'noob' amateur thing possible when troubleshooting. You’re free to fix your own gear however you want, but objecting to other people performing a five-second safety check is comical and childish at best.

 

[Cafguy]

When you first start the Drone do all the motors "twitch" like normal. If not your ESC was damaged OR a Cable was loosened...During your crash..This is most likely Because DJI Drones are notorious for loose connections after a hard landing or Crash.
You can visually see if its a sensor by simply putting the drone in a mode and checking for the red sensor light as you move around the Drone. Inspect the sensors for damage or dirt.
DJI Drones will Flip over in place if the Props are installed incorrectly...I had one that wouldnt flip BUT it woudnt get off the ground either, ...Check your ESC its either busted or the connection to it was lost in the crash.
Finally if you re-calibrated Did you re-cal Everything?
If the motor was damaged you would be getting more errors than just this...

 

[EricJT]

"You're right that an inverted prop on a Mavic 2 Pro pushes air up, effectively 'sinking' that corner."

I have an M2P and I don't understand how you could "invert" a prop given the latching system....now placing a prop on the wrong motor is possible but that is why there is a marking on 2 of the props and motors to try and prevent it.

 

[Nexus Dragoon]

"You're right that an inverted prop on a Mavic 2 Pro pushes air up, effectively 'sinking' that corner."

I have an M2P and I don't understand how you could "invert" a prop given the latching system....now placing a prop on the wrong motor is possible but that is why there is a marking on 2 of the props and motors to try and prevent it.

That's what I mean by inverted, and the suggestion was because if you replace the prop and have a problem right after, and you don't at least check to see if you did it right, then you're skipping the first thing you should check. its like pulling apart a pc that didn't turn on before you even check to see if you plugged it in. You do the quick and easy stuff first, skipping that is such a noob move.

 

[Meta4]

You do the quick and easy stuff first, skipping that is such a noob move.

Imagining that your drone could even lift off in that scenario, let alone hover in place is a genuine noob move.