Quadcopter / August 10, 2018 / Sanni Pekkarinen
This was an easy decision. Since this was going to be my first multirotor I threw out the idea of a 6 or 8 motor design right away. Theres already too much complexity in even a very basic design. No need to make the job any harder! I was going to keep it really simple and then go on from there. Tricopters have been very successful. But I really hate the idea of the yaw (directional) stabilization servo in the back. I see it as a weak point. Just like a traditional helicopter it is another weak point susceptible to mechanical failure. So in the end the decision was easy. I went with a quadcopter design. This is a very simple design where the motors are spinning counter-rotating propellers.
Second you will need a flight control board. This is the brains of the quadcopter. It controls how the motors work. When choosing your flight control board it is important to remember that not all flight control boards are created equal. Some are extremely sophisticated and capable of numerous functions such as GPS mission planning return to home and loiter modes. Choose your flight control board based only on what you really need when you are just getting started you will not need all the bells and whistles. Third you will need the motors and electronics speed controllers (ESC). The ESCs interface with the flight control board which receives commands from the receiver. The flight control board calculates what the motors need to do to make the quadcopter do what the user is telling it to do then tells the ESCs which in turn tell motors how to spin.
You may have seen some pretty amazing flying vehicles these days. UAVs (unmanned aerial vehicles) are becoming more and more common. The hobby is also getting more and more easy to get into. But with the great range of models and brands you may wonder what is the best quadcopter to start out with. There are a several variations of the multirotor family. The most common is the quadcopter like the DJI Phantom. A quadcopter uses four motors and propellers to generate the thrust necessary to lift the aircraft. It can be more mechanically simple than a traditional helicopter that requires a tail rotor to counteract the angular torque produced by the main rotor and the main rotor does not require collective pitch and other mechanical complexities. With a quadcopter the pitch is fixed and the flight control is achieved by actively changing the motor RPM (revolutions per second).