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. There is two major risks to a large voltage drop (single cell below 3V): first, the maximum thrust of the aircraft power system is not enough to maintain 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.
Aircraft with a heavier weight require more current to maintain power. The aircraft continues to fly with large maneuvers. If the throttle is full, the battery will continue to discharge at high current. In the plateau, 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 take-off, 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.