Some comparisons of UAV industry

1. What is the difference and definition between Japanese hand and American hand?

Answer: Because the regions where the model airplane activities were carried out earlier were Japan and North America, the functional definitions of the two rockers and four channels in the controller were different in these two regions. Such as Japanese hand, left rocker: up and down elevator, left and right rudder; Right rocker: throttle rudder up and down, aileron rudder left and right. American hand, left rocker: throttle rudder up and down, left and right rudder; Right rocker: elevator up and down, aileron rudder left and right. This is mainly based on personal preference, just like driving a car with left-hand drive, mainly in Chinese mainland and North America, right-hand drive, major Commonwealth countries and some regions, such as Britain and Hong Kong, China. From the point of view of theoretical safety, the left-hand drive car is better in the northern hemisphere, but it is mainly a matter of habit formation. The advantages and disadvantages of American hands and Japanese hands are usually in the operation of some ultra-difficult movements, and there is a difference in operation speed.

2. Selection and brand of remote control?

Answer: The remote controllers are imported and made in China, including Tiandifei, Walkera, FlySky, FrSky and Le Di, and imported Futaba (Japan), JR (Japan), ROBBE (Germany) and Graupner (Germany). In the early days, the domestic electronic level was poor. The performance-price ratio is very high. The remote controller mainly pursues practicality and stability, and should not excessively pursue advanced configuration. The Chinese interface of the domestic remote controller is simple and affordable, and the supporting receiver is also cheap. A set of remote controller and receiver can not exceed that of 1000 yuan. Choose Futaba T8FG14SG and JR9XG7G11, and the price starts at more than 1500, and the receiver is expensive. Beginners can start with FS-I6 or FrSky Tanaris X9D, and then upgrade according to the needs of the aircraft they are playing. Usually, most fixed-wing aircraft and helicopters can be controlled with only six channels, or even four channels in the early days, that is, throttle, aileron, lift and direction.

3. What is the difference between PCM and PPM?

Answer: This mainly refers to the coding method of the remote controller. PPM is equivalent to analog transmission, and the radio waveform is directly transmitted to the receiver and transmitted to the steering gear for execution. PCM is to first process the signal, form a digital model and encode it before transmitting it. The receiver needs a decoding and restoration process, and then transmits it to the steering gear for execution. Similar to the previous analog signal transmission TV and the current digital signal TV.