Isabelle Bousquet Quadcopter June 12th, 2018 - 13:54:19
A good rule of thumb is to use speed controls that can handle one and a half times the current needed to maintain a hover. My two pound (1 kg) quad needs 150 watts to hover which is approximately 40 watts per motor. With three cells in series in the battery this is less than four amps per speed control (there is one per motor). I originally chose a 25 amp ESC because I was afraid of overloading it. In the future I would use a 10 to 15 amp ESC for a quad like that. I used a 10x4.7 propeller for a simple reason. It is very common and lots of other quadcopters use it. It is also easy to find in reverse rotation versions. A larger-diameter low-pitch propeller is a good choice for a quad.
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.
UAV stands for Unmanned Aerial Vehicle and it covers all remotely controlled machines that are also known as quadcopters as well as aircraft used by the US air force. These machines are mainly used by military and police officers to carry out an operation where a manned aircraft seems impractical or too risky. Unmanned aircraft are not new; they have been in use since the World War I. However at that time the control was mechanical and the aircraft could only go as far as the fuel would allow. Later on devices that could be controlled with the help of radio or infra-red technology were developed. These devices became the predecessors of the modern quadcopter that employs integrated circuit or computer chips and can be programmed to fly for a definite time period in a definite direction fulfilling a definite purpose.
Bind-and-Fly on the other hand requires you to first bind the machine with its transmitter before taking it off ground. Such a machine is not meant for hobbyists as it requires a little assembly which only experts can handle. Similarly ARF or Almost-Ready-to-Fly aircraft require some sort of assembly before they could be used. These machines come with an instructions manual so that anyone could assemble it easily and quickly. They are perfect for expert pilots who already have the radio equipment (the transmitter and the receiver) and are only looking for other parts to complete the structure of their vehicles. All these UAVs are available off-the-shelf in the price range of $50 to $3000 and even more depending on their specifications model and overall design. Most quadcopters are very robust and durable and therefore they last for a long time if handled properly. Although these UAVs are considered friendly they do pose threat to public safety as they can mistakenly fly over private property and no-fly zones or collide with another aircraft damage something or crash land somewhere unknown. It is therefore advisable to follow the precautionary measures while flying these seemingly harmless quadcopters for the sake of fun in order to ensure safety.