Entering December, the weather is getting colder. But compared to the colorful spring, the blue sky and the blue sky, the golden autumn, the plain winter has a different style. How to achieve "cool fly" in the cold weather, what are the skills of the drone ?
The aircraft is powered by a lithium battery, and the low temperature environment will seriously degrade the performance of the lithium battery. When the battery is exposed to an environment below 15 ° C, the chemical activity of the battery is significantly reduced, the internal resistance is increased to cause a decrease in discharge capacity, and the voltage drop is increased when the battery is discharged. A significant drop in voltage (single cells below 3V) has two major risks: first, the maximum thrust of the aircraft's powertrain is not sufficient to sustain flight; second, the battery will be actively shut down to avoid over-discharge of the battery. This feature is a common problem of lithium batteries, and there is still no perfect solution. Smart devices such as mobile phones and tablet PCs that everyone uses will also shut down in low temperature environments.
The aircraft with a heavier weight itself needs more current to maintain the power; the aircraft continues to fly a large maneuver. If the full throttle climbs, the battery will continue to discharge large currents. In the highland area, due to the thin air and low air pressure, the aircraft needs to be higher. The motor speed is maintained to maintain power and the battery output current is further increased. The above situation, combined with the low temperature in winter, further increases the battery voltage drop. If the low battery takes off, the initial battery voltage is low, and the battery body temperature is low, the voltage will be pulled down quickly, increasing the risk of insufficient voltage. Therefore, we have always emphasized the full power flight.
In response to the above questions, it is recommended that you take the following three steps:
1. Before flying, be sure to fully charge the battery to ensure that the battery is in a high voltage state.
2. Fully preheat the battery to more than 20 degrees to reduce the internal resistance of the battery. It is recommended to use a battery preheater to preheat the battery.
3. After the takeoff, keep the aircraft hovering for about one minute, let the battery use internal heat, let yourself fully preheat, and reduce the internal resistance of the battery.
In the winter, the aerial photography aircraft, in addition to the regular inspection items, also need to pay attention to the following:
1. Before taking off, ensure that the remote control, aircraft and monitoring equipment are fully charged.
Second, pay attention to observe the battery temperature of the aircraft. When the temperature is below -10 °C, the battery is forbidden to use. When the battery temperature is between -10 °C and 5 °C, it needs to be kept in a low-altitude hover state after take-off. The battery is preheated. When the temperature reaches 5 °C or above, it can fly normally. It should be noted that if the ambient temperature is too low ( For example, below -20 ° C), the battery may not be preheated by low-altitude hovering, and the battery temperature should be above 5 ° C by other methods such as preheater. The optimal operating temperature of the battery is 20 ° C, so try to make the battery temperature reach 20 ° C to 25 ° C, and then normal flight.
Third, use battery insulation stickers or other insulation measures.
Fourth, avoid flying, it is recommended to set the low battery alarm to 50%, because in the low temperature environment, the voltage drop will be very fast, the return operation should be carried out as soon as possible after the alarm.
Fifth, pay attention to the amount of the pole, try not to operate for a long time.
6. If the flight was taken in snowy weather. ( HIGH GREAT is not recommended to fly in this environment)
The aircraft needs to be dehumidified after the flight, and sometimes it will freeze. The treatment method is to use a napkin with good texture to wrap the water, and observe it at all times to prevent liquid from entering the interior of the aircraft.
7. In the case of severe low voltage, the aircraft will be forced to land. At this time, the throttle stick will be kept at the neutral position and the aircraft cannot be hovered. In such cases, it is necessary to remain calm. During the descent, the aircraft is still in a controllable state. The aircraft can be hovered or slowly raised by pushing the throttle upwards. The direction of the flight is controlled by operating the direction bar to control the aircraft to safety. Landing down.
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