The main faults of quadrocopters and methods of their elimination

If the second scenario happens, it might necessitate costly repairs. However, it’s also possible to easily resolve damage to the electronic components. For instance, fixing the contact between the GPS antenna and the processing unit is a simple task. Let’s explore the primary reasons for drone malfunctions and the techniques for rectifying them.

Copter does not take off

Beginners often ask why their quadrocopter fails to take off even when the engines are running at maximum speed. The reason for this problem typically lies in the incorrect placement of the propellers. The engines on the diagonal of the quadrocopter’s frame rotate in the same direction, which means that the propellers should be installed in a specific manner to ensure proper operation.

Each set of blade assemblies is marked as CW and CCW, which stands for clockwise and counterclockwise rotation, respectively. To enable the copter to take off and ascend vertically, it is sufficient to follow the instructions and ensure that the propellers are installed correctly.

Note! Incorrect blade rotation can also cause the drone to spin on the ground.

One of the propellers does not rotate

This issue frequently arises on drones that utilize collector motors. One critical component of the motor design is the contact brushes. These brushes are subject to high levels of wear and have a limited lifespan. So, if one of the propellers fails to spin, the first thing to investigate is the condition of the motor brushes.

Another potential cause of this malfunction is an internal short circuit within the motor windings. In such cases, it is advisable to replace the motor. Attempting a repair could result in the motor’s characteristics being altered and potentially disrupt the overall balance of the drone system.

The occurrence of malfunctions in the electronic system that controls motor speeds is infrequent. However, it is not feasible to completely eliminate this possibility, particularly in drones equipped with motors without collectors. To verify the functionality of the primary stroke regulator, a different operational motor from another drone is connected to it. If the motor fails to rotate upon startup, it indicates the necessity of replacing a component of the drone’s electronic circuitry.

Increased operating noise and unstable flight

If the drone produces excessive noise and experiences sudden tilting during flight, it is recommended to inspect the condition of the rotor blades. They may have become deformed or damaged as a result of collisions with obstacles or rough landings. Power off the drone and perform a thorough examination of the propeller assemblies.

Pro tip! Blade damage can be easily detected by aligning the entire propeller surface with your line of sight.

If the blade has a curved shape, it indicates that it is no longer generating sufficient lift force. This is particularly noticeable during flight, especially at higher engine speeds. The propeller can be adjusted carefully to level it out, or a replacement blade can be installed.

In helicopter models that have a gearbox, increased noise can be caused by both contamination and physical damage. The gearbox contains a system of gears. If there is a lack of lubrication, contaminants can enter and cause excessive noise. This can also lead to physical damage to the drive pinion. Repairs for this issue involve inspecting the gearbox and replacing any worn or broken parts.

Can’t see the remote

In many instances, the failure of the copter to connect to the remote control can be attributed to a power issue. This can occur for various reasons, including:

• The batteries in the remote control have completely run out of power, causing the drone to lose connection with the remote control.
• Rust may have formed on the contact pads of the battery compartment in the remote control due to moisture, leading to a loss of connection.
• The current battery voltage is insufficient for maintaining communication beyond a distance of 30 meters.

The first step to take when there is no communication with the remote control is to change the batteries. If corrosion is detected on the contacts within the compartment, it should be eliminated.

Keep in mind! Another possible reason for the lack of communication between the drone and the remote control is simply ignoring the instructions. Some models of drones are known to have difficulty synchronizing when they are upside down or tilted.

If replacing the batteries and following the instructions does not yield a positive outcome, it is recommended to seek assistance from a service workshop to diagnose the equipment. The issue may be due to electronic component failure within the remote control or drone, or damage to the antenna units of the radio modems.

Incorrect positioning in flight

If the helicopter is not behaving correctly, such as rolling on its side during flight or flipping over during takeoff, it indicates that the initial calibration is incorrect. The correct calibration procedure can be found in the model’s instruction manual. Typically, resetting the settings and placing the drone on a flat surface to recalibrate is sufficient.

Control system malfunctions can also cause rolling during flight and other abnormal behavior. In such cases, the drone and the joystick both need to be calibrated. The joystick’s positioning can be adjusted by tightening the linkages or modifying the digital settings. The manufacturer may provide automatic or manual calibration options for their models, and all instructions can be found in the drone’s documentation.

GPS problems

Satellite navigation issues often arise from antenna problems, which can include:

• a complete loss of connection between the board and the antenna;
• severe contamination of the antenna surface;
• deformation or damage to the antenna.

In addition, inclement weather can also prevent the drone from accessing GPS. In either case, it is advisable to check the physical condition of the antenna. If needed, the antenna should be cleaned or replaced with a new one in the event of damage.

The copter refuses to perform aerobatic figures

There are various built-in features in many drones that allow for automatic execution of aerobatics. Oftentimes, users tend to neglect reading the instruction manuals. During training modes, at low speeds, or in situations where the stabilization system fails or is intentionally deactivated, piloting figures cannot be performed.

It is crucial to note that, despite their simplicity and overall dependable performance, attempting to repair drones using makeshift means is strongly discouraged. Therefore, if the malfunction is not accurately diagnosed, it is advisable to seek assistance from specialized workshops.

The most popular quadrocopters of 2026

The DJI Mavic Air drone is available for purchase on Yandex Market.

You can also find the DJI Mavic Air Fly More Combo quadcopter on Yandex Market.

If you’re looking for a more advanced option, the DJI Mavic 2 Pro Quadcopter is also sold on Yandex Market.

Alternatively, you can consider the DJI Mavic 2 Zoom Quadcopter, which is another great choice available on Yandex Market.

Lastly, the DJI Spark Fly More Combo is also listed on Yandex Market for those who prefer a smaller and more portable option.