For a new technological invention, people are always used to blindly follow instead of trying to know and understand. The quadcopter, or can be called as the drone, is no exception. Happily, with the quadcopter cost reduction, a considerable number of people began to actually use quadcopter and applied it to travel, live, entertainment, photography, disaster news reports, and other scenes. This time, the quadcopter can be said to be officially entered the consumer area. Rhett Allain, a professor of physics at the University of Louisiana, shared some of the physical principles of drone in the article "How Do Drones Fly Physics, of Course!", So that we can better understand its principle. This is very necessary for the beginner who doesn’t know the drone quite well but ready to buy one.
Besides, you might also need to know some quadcopter spare parts such as the 3.7v battery or the 7.4v volt lithium battery and the charger.
Vertical movement
The quadcopter use rotor to achieve movement. The relativity of force means that when the rotor drives the air, the air will reverse the rotor. This is the basic principles of the quadcopter being able to vertical move up and down. Further, the faster the rotation of the rotor, the higher the lift, and vice versa.
Three basics
Today's quadcopter can do three things: hover, rise, and fall. When hovering, four rotor’s thrust is equal to the downward gravity. This is very easy to understand. So how about rising? Increase the thrust of the four rotors to produce an upward force which should be greater than the gravity. So when falling, on the contrary, just reduce the rotor thrust speed.
Rotate
How to make a flying north quadcopter to turn south? What is the principle of the movement of the rotor at this time?
When the two sets of rotors are rotating in the opposite direction, the total power of the quadcopter is zero. So it can achieve hover. If you want to turn right, you need to reduce the angular velocity of a group of rotors. However, although the lack of thrust from the rotor 1 can make the quadcopter to change the direction of movement, at the same time the upward force is not equal to the downward gravity, so it will decline.
So another question is - how to keep the quadcopter change the direction but still in the same height level?
While reducing the rotation speed of a group 1 rotors, at the same time, increase the rotation speed of another group of rotors. At this point, the angular force of the rotor is still not zero, so the quadcopter can rotate. While the total force is still equal to the gravity, so it can be kept at the same height. Turning left is also the same.
By explaining the principle as easy to understand as possible, I hope this article will be practical for you. At the end, I also want to recommend the Syma quadcopter for you which is a good choice for drone beginner.
