[Solved] Drone Overmax X Bee 2.5 Loses Strength to Float: Motor Replacement & Troubleshooting Tips

Hello forum users.
My problem looks like this. One unfortunate day my drone flight ended in a fall on the grass. Overmax x bee 2.5 drone. The first symptoms are the lack of reaction of two brush motors. I ordered 4 engines and replaced all of them. After the whole operation I was glad to return to the place of flight and this is where the problem begins. The drone "works" but it has no strength to float, sometimes it will rise a little, sometimes it hangs in the air despite the stick for max, and sometimes even slowly falls down. Even when it floats, it feels that it is not the same drone. After many attempts at combining, I ordered a different (smaller) frame for larger brush motors and other batteries with a stronger maximum discharge current. The effect is the same. And here is the question, where can I still look for the reason ?? Could something burn on the drone's flight controller to match these symptoms? I would add that I did not notice any major problems with maintaining the drone's position in the air, it is far from ideal, but behaves like before a fault.

Overmax x bee 2.5 brush motors,
check power supply voltage after charging and under load,
check if the electronics heat up.
Check if the gearing is functional and not jamming during slow rotation of the propeller.

I will check the power supply tomorrow, because I can't currently. The electronics do not heat up, holding it in my hand, running for a few moments, I could not feel the heat. Sprockets are functional, they all run smoothly. I noticed one more symptom .... as long as the stick is not set to the maximum tilt up, the drone in the room holds its position, but when I turn up rapidly, it suddenly escapes to the left / back.

SzkitekWLKP wrote:

but when I turn it up abruptly it suddenly runs left / back.

This may indicate faulty engines or electronics.
When you turn off the engines do they lose the same speed?
Propeller engines probably not mistaken for the location?

Propellers put in the right direction, engines according to revolutions as well. When cutting the rod, one propeller stops faster, unfortunately right / back, i.e. it does not affect the drift in the opposite direction, unless I'm wrong. Voltage on the cell looks as follows max 4.2V after a few minutes in the air in one position (if it succeeds) around 3.4V.

Added after 3 [minutes]:

I would add that the problem of floating was probably partly due to the propellers. After changing the propellers to larger ones with a larger pitch, the drone hovers better, but there is still a problem of sudden drift to one side with a vigorous increase in engine revolutions.

Replace the battery, the voltage drops too quickly.

SzkitekWLKP wrote:

the propeller stops faster, unfortunately right / rear

Everything is affected by a possible damaged engine or gearing.

I know that many things can be the cause but as I described the drone maintains its position in place at a height of e.g. 1 meter. If any engine were shot it probably would always endure it ?? I might be wrong. The second thing is that he puts him to the left and the engine that stops faster is on the right. Voltage with a second battery similar 3.5 / 3.6V

SzkitekWLKP wrote:

If an engine were shot it would probably always bear it

No, the engine does not reach its power / RPM under higher load.
Weak batteries look for something branded to size and plug -

LiPO Turnigy NanoTech 1S 750mAh 3.7V 35 / 70C pack (7307142724)

Mr. Paweł, it's possible that the batteries are weak but it can happen with a charged cell and after a few minutes it will rise well where it already has a lower voltage. The same with engines, since sometimes it will rise well and sometimes it will stand it, should I understand that engines when they want to achieve their power and if they are in a bad mood then ??

Mounted in x bee 2.5 brush motors commutator brushes are plates that overheat quickly,
the easiest way is to check it under load with a propeller how much power they are consuming and what revolutions are obtained.
Toothed gear resistances also affect engine performance.

Perhaps that damaged electronics.

I started to think since you keep writing about these engines. I did a simple test, I translated all the motors diagonally to the second position. The effect remained the same. Still bear left / back. Can this exclude engines ?? If electronics then where to look for the problem ?? THIS is a cheap model for which I do not want to buy additional parts.

There should be a trimmer on the remote control. So set them so that the drone is stable.

Expand photos and drone and pilot at all.

If the electronics in the drone are crooked, then there can also be the same effect (there is a gyroscope on it). Anyway, you wrote that he fell. Check the electronics and set it up. And if it is correctly mounted, then drone pickup.

I trimmed it more than once, I have drone over several dozen hours so basics such as trimming, calibrating and mounting engines and propellers in the right direction I have mastered. Regarding the gyroscope, I also know what it is used for and despite spinning the drone I am sure that the plate sits straight because it holds the position at a lower speed. The problem is solved. The propellers I bought were flimsy, definitely one. Apparently at higher revs, the drone felt a growing difference in poorly balanced or poorly shaped wings for the rest of the wings. For the future for others who encounter such or similar problems, try to start with the wings and not like me with the complete dismantling of the drone for the first part. Thank you all for your help and best regards. Topic is closed