Bring up the drone , I believe that the first picture that you will find in your mind will be a four-rotor shape, as if all the drones can't escape the shadow of the four-rotor. However, the drone really only has four rotors to rely on?
Recently, according to foreign media reports: American researchers have created an unmanned aerial vehicle with only one rotor. The drone uses an asymmetric design, and more importantly, the only parts that can be moved by the entire drone are only a propeller.
After watching this drone, you may think that this gadget is not much higher than the bamboo raft. At most, it is the level of the remote-controlled flying toy that can be seen everywhere in Huaqiang North, but this single-rotor drone actually still has Highly technical, it allows time to receive people's remote control in the air.
The drone, known as the single-channel rotorcraft, was invented a few months ago. The drone has only one moving part - the propeller, no flaps, no hinges, no ailerons, no other actuators and any controllers, and the entire aircraft is controlled by a simple propeller. Despite its simple mechanical structure, its electronic brain is well developed and precise enough to allow it to fly arbitrarily in the air.
Do you think this thing is no different from a rotorcraft helicopter?
Wrong, the difference can be big.
In the field of drones, the most common aircraft are usually divided into fixed-wing, helicopter and multi-rotor (four axes in the multi-rotor are also mainstream), and this aircraft turns the multi-rotor into a single rotor, and Helicopters still have a big difference.
In fact, a few years ago, helicopters and fixed wings were the hegemons in the field of drones. There was no more rotors at all. However, with the launch of the DJI Elf Phantom quadrotor in previous years, this situation has been broken. Because Phantom has greatly reduced the difficulty and cost of aerial photography, it has been enthusiastic in the market and has become the best-selling product to date. In just two years, the ideas and technologies surrounding the multi-rotor aircraft emerged in an endless stream. For a time, it seems that all the drones have become the same.
The reason why the multi-rotor is more successful than the helicopter, in addition to the simple and low cost of control, there is one of the most important reasons is that its mechanical reliability is relatively high, which is one of the most important differences between multi-rotor and helicopter.
Compared with multi-rotor drones, helicopters need to have thousands of moving mechanical connecting parts, which will cause wear during flight, resulting in reduced reliability. The cost of these unstable factors is high, and it may be The human body is hurting. There are no moving parts on the multi-rotor, and its reliability basically depends on the reliability of the brushless motor, so the reliability is high. Let's take a look at the comparison of the mechanical structure of helicopters and multi-rotor UAVs.
Helicopter mechanical structure
Multi-rotor drone shaft
Obviously the structure of the helicopter is much more complex and complex than the multi-rotor drone.
In addition, helicopters usually require a tail rotor and a pair of rotors in opposite directions to maintain balance in flight. A single-rotor drone requires only one rotor. It uses an asymmetric and unbalanced fuselage design. To maintain flight and controllability.
In fact, decades ago, the skilled pilot's remotely operated aircraft had only two moving parts - the rotor paddle and the rudder at the tail. This "single-channel rotorcraft" proves that only one moving part is needed for the remote-controlled aircraft.
However, this "single-channel rotorcraft" is too simple to calculate compared to helicopters and four-axis drones. That is to say, in order for him to fly, he must fly him out in the right way. OK, so the probability of its successful release depends on the proficiency of the operation. In addition, its handling flexibility is relatively weak, because he needs to keep spinning to keep balance when flying, so he can not complete tasks such as aerial photography.
Until now, we don't know where this single-axis drone can be used. It just proves that single-axis can also fly remotely.
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