How to prevent DJI Mavic Mini aircraft from crashing?
By Sigismondo Eisenhower 2019-11-15 2544 0
Why do drones crash?
● Propeller malfunction
Your drone's rotors/propellers are made to be both sturdy and soft so as not to hurt people or damage other objects. They are therefore very susceptible to bending out of shape after several bumps. Always check each of the rotors before a flight to make sure they are in perfect shape.
● No GPS signal
If you're flying your drone around the house, you're almost certainly not getting a GPS signal. It is therefore recommended, where possible, to always fly in open areas away from tall buildings.
Incorrectly calibrated compasses are a major cause of drones crashes. Drone compasses can be disabled by any magnetic and radio frequency (RF) source. Avoid keeping the drone too close to magnets, such as car speakers during transport, and fly in an environment with high electromagnetic interference, such as high-voltage power lines and mobile phone repeaters.
● Video transmissions not connected
This is another common cause of drone-related accidents and can happen at any time, from the first flight to a few months later and is usually caused by loose cables and damaged ports. Make sure that the cables are always well connected before flying and disconnect them carefully afterwards, to keep the ports in good condition.
● Inappropriate use of the RETURN to Home button
When you lose control of your drone, as a pilot one of the fastest natural reactions would be to press the Return to Home (RTH) button. It is worth keeping in mind that most drones can't avoid obstacles. This means that the FVO simply draws a straight line to the starting point, even if there are trees or buildings or light poles along the way: this can easily cause a serious accident.
You don't have to panic to press the RTH button every time you lose control of the UAV, stay calm and discover a better move.
● HOME POINT incorrect
This sometimes happens when the GPS lock is lost during flight and then regained, causing the drone to recalibrate an incorrect base point.
Keep in mind that the home point can be the place where your UAV took off or wherever your remote control is: check that it is correct. Finally, be sure to set the return altitude so that it is higher than anything in the area, 100 meters should work well unless you are traveling in a city or near particularly high structures such as telephone masts.
● Battery discharged
It is essential to always fly with a fully charged battery and never be tempted to start a new flight with a discharged or partially charged battery. Most likely most of the time you use a semi-charged battery and you always run the risk of randomly losing power in the middle of the flight, when you least expect it.
● Insufficient battery charge to return to the base
It is important to land with your drone with a power reserve of 30%, so that in case an emergency requires delaying the landing, you have enough time to find a new landing point or address the problem. In addition, some UAVs are equipped with a failsafe function in which the drone automatically heads to the starting point once the battery reaches 10% and while this may be useful, if there are trees or other obstacles between the drone and its starting point, it will fly straight towards them.
● Clash with another drone
If there are other aircrafts in flight, there is always the possibility of a collision, especially if the pilots are not both aware of the presence of the other in the area or are performing complex flight maneuvers or races.
● Wrong direction of flight
When the drone is flying high in the sky, it may be difficult to say, especially for beginner pilots, it may be easy to swap the front for the back and then misroute the UAV. Be sure to familiarize yourself with which side it is that before you fly further away.
What to do step by step after a drone crash?
No matter how experienced you are, when you own a drone, you have to face the fact that an accident could happen. Sometimes it's your fault; sometimes it's due to conditions beyond your control. Anyway, your beloved drone, at some point in its life period could fall and get damaged. So, what should you do if this happens?
First of all, try to get the drone back. After recovering your drone, check it for damage. Make a note of the damage you can see and take it as a reference in case you need to contact the drone manufacturer. Below are some useful steps that you can perform after retrieving the drone from the crash site:
Step 1: Turn off the UAV/controller and remove the battery and propellers.
Step 2: Clean all dirt, sand or debris from the drone using compressed air and alcohol.
Step 3: Manually rotate the rotors while the drone is upside down to remove sand or dirt and then blow on each of them (or use compressed air) to remove residual dirt.
Step 4: Check the correct rotation of the gimbal, if it has bent parts or cracks.
Step 5: Check if the camera has any cracks or wires disconnected.
Step 6: Check the battery for structural damage.
Step 7: Remove propellers and check for cracks or deformities. If necessary, replace propellers that show signs or splinters.
Step 8: Check all gimbal bearings and insert guards to make sure they are firmly seated and intact.
Step 9: Check the entire structure for cracks, including the landing gear.
Step 10: Check each motor to make sure it is correctly positioned and not loose (including all screws)
Step 11: Blow away sand, debris, dust from all moving parts (again).
Step 12: Re-insert the battery into the drone after completing a thorough/clean check.
Step 13: Turn on the drone on a flat surface and start a new start-up procedure.
Step 14: Calibrate the compass and then the IMU.
Step 15: Check that the gimbal is working properly by using manual control and also moving the drone on the three axes.
Step 16: Start the motors without propellers and check for abnormal vibrations.
Step 17: Switch off the motors again, connect the propellers, restart the motors and check again if abnormal vibrations are present.
Step 18: Hover the drone to a height just above eye level and check for abnormal movement or oscillation.
Step 19: During video recording, perform basic maneuvers (forward, backward, left, right, left yaw, right yaw, up, down).
Step 20: Check the video to make sure there are no unwanted vibrations in the recording.
Step 21: Make a long-distance flight low and slow (not over water) to make sure everything works properly.
Drones are highly complex devices that rely on various systems to function properly. You need to be aware of the things you can control and the mistakes you can avoid to minimize the chances of crashing or even losing your drone. Most accidents can be prevented by being vigilant and diligent in maintaining the device, and thus be a happy and productive drone-pilot.
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