In general, multi-rotor production requires the preparation of the following parts (four axes for example):
Brushless motor (4);
Electronic governor (commonly known as ESC, 4);
Propeller (4, 2 positive pulp, 2 counter-pulp);
Flight controller (commonly known as flight control);
Remote control (four-channel or more remote control);
battery;
charger;
frame;
The model of the brushless motor is very important. Take the plant protection drone as an example. Generally, the 4 axis, 10KG load is selected as the 8320 motor (the maximum pull force is about 14KG, with 30/32 inch paddle).
Generally 6-axis, 10KG load selection 8312 motor (maximum tensile force of 10KG motor, with 30-inch paddle).
The KV values ​​of these two motors are relatively low, the lower the KV, the higher the withstand voltage, and the two motors are stable and have good heat (online evaluation).
The overall structure is like this (four-axis plant protection drone):
In maneuverability: multi-rotor control is the simplest, it can take off and land vertically without the need for a runway, and can hover in the air after take-off. Its handling principle is also simple. Relatively speaking, learning to fly with fixed wings and helicopters is not a simple matter. The fixed-wing flight site is required to be wide, and the inter-channel coupling occurs during the helicopter flight. The design of the autopilot controller is difficult and the controller adjustment is difficult. Regardless of the type of aircraft, you can test the flight on the simulated aircraft for a period of time before the official flight to avoid "fried chicken."
In terms of reliability: if only the reliability of the machine is considered, the multi-rotor has no moving parts, and its reliability basically depends on the reliability of the brushless motor, so the reliability is high. In comparison, fixed-wing and helicopters have moving mechanical joints that wear out during flight, resulting in reduced reliability. Moreover, the multi-rotor can hover, the flight range is controlled, and it is safer than the fixed wing.
In equipment replacement: the multi-rotor structure is simpler than fixed-wing and helicopter. If the motor, electronic governor, battery, paddle and rack are damaged, it is easy to replace. There are more fixed-wing and helicopter parts, and the installation requires skill, which is relatively troublesome.
However, in terms of endurance performance, the multi-rotor performance is significantly weaker than the other two models, and its energy conversion efficiency is low; in terms of load bearing performance, the multi-rotor is also the worst of the three.
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