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Limit load take-off weight: The battery fully charged, the maximum weight the aircraft can pull up. This is mainly related to the battery voltage, motor model, propeller shape, the maximum current ESC support. Single motor of X650 provide up to 1.2Kg thrust, that is 4.8Kg thrust for one X650 aircraft. However, it does not have any sense, due to there is almost no power left to maintain flying, and the mechanical structure, ESC or other accessories may be damaged

General ESC has been very mature after years of development, many species, current from small ampere to large ampere. But the general ESC are not designed for multi-rotor craft, there are a few common problem if it used in multi-rotor craft:

All along along, the brushless motor speed controller (ESC) of four-rotor aircraft mostly use I2C digital communication. It put all brushless motor speed controller connection in series on the bus through two data lines (one for the clock SCL, one for data SDA), and send the control signals to brushless motor speed controller at regular time. MK products used this communication mode, as well as our early X500D X600D.

XAircraft has designed several flight controllers for internal research and development and testing without sell since 2007.

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Apple iPhone 4 and iPad let everyone know an unfamiliar industry standards: Micro SIM card. The Micro SIM was developed by the European Telecommunications Standards Institute.

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