Isabelle Bousquet Quadcopter June 12th, 2018 - 13:59:03
Fourth you will need a battery to power all the electronics. Lithium Polymer (LiPo) batteries are the most popular batteries for the RC hobby. LiPo batteries are characterized by their number of cells (voltage) and capacity (mAh). Each LiPo cell has 3.7V so a 1S (1 cell) battery will be 3.7V a 2S battery will be 7.4V 3S 11.1 V and so forth. Capacity is rated in milliamp hours (mAh). The higher the number of mAh the longer the battery can power the quadcopter. Lastly you will need a frame to put all this onto. There are many commercially available quadcopter frames. Some are in the + configuration which means one of the arms acts as the "forward" orientation. Some are in the X configuration which means that "forward" is between two of the arms. There is also the H frame where forward is on the flat side of the H. H frame is great for FPV and aerial photography since the rotors are out of the way.
If you have ever wondered what you need to get started in the RC hobby of multirotors this is the place for you. In this article I am going to outline all the basic components that are necessary to get started building your own quadcopter. First you are going to need a transmitter. The transmitter is the radio control that you use to communicate with your unmanned aerial vehicle (UAV). There are various types of transmitter that are categorized by brand frequency and number of channels. For a quadcopter you need at least a 4 channel transmitter but I would suggest getting a 6 channel transmitter that works on the 2.4GHz frequency.
In order to take off you only need to push the throttle up but make sure you do it very slowly till the copter lifts off. Push it back to zero to see how the machine will land once the flight is over. Remember this is the most important step so master it by repeating it many times and then checking if the copter tries to move on its own. If you are not pushing any control and the machine is still rotating rolling or moving you need to use the trim buttons to balance it out. Without doing this step you wont be able to get a smooth flight so dont overlook its importance. To hover in mid-air you will need to experiment a little with the controls. When you decide your flight is over and the machine now needs to land slowly start cutting back the throttle. Remember there is nobody aboard the copter so even if it drops to the ground its perfectly all right. Just make sure you push the throttle suddenly to zero only when the machine is only an inch or two up from the ground.
So in a quadcopter each of the motors are configured such that they cancel one of the others out. So when you want to yaw (turn right or left) then two motors across from each other diagonally will reduce their speed and the other two across from each other will increase theirs. This maintains the lift necessary to maintain altitude but imparts angular torque to the aircraft which makes it turn. Now it would be impossible for a human to calculate exactly how much change in RPM to impart to a quadctopers individual motors to maintain control so these calculations are carried out by a flight control board. This board is usually equipped with pyrometers and sometimes accelerometers. It has software that controls the motors based on the position of the aircraft and user inputs from the transmitter.