The bottom fiber board is served as a protection to the battery against crash. Mounting the battery on the top with a rubber band, there will be a shock absorption buffer during crash. Pilots may also add an anti-slip sheet between the battery and the frame to…

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Some pilots report that it is difficult to install the servo after the frame is finished. Here is the tips: Use the Tiny Philip (+) driver which is already magnetic, and place the servo with nuts Outside. Just like the above diagram. The tiny philip driver is available at our reseller site. It is included…

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4.75mm ball and ball-link are the most common combination in 400 class market, while 3.5mm ball and ball-link dominates the 300 class market. Smaller size of ball has less angle of joint due to the screw size cannot be too small. For bigger size, it is a kind of overhead that…

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Our system provides three kinds of gear ratio (main gear : tail gear) 1 : 4.20 1 : 3.82 1 : 4.00 1 : 3.64 Pilots need to choose the correct gear ratio to suit their helicopter. Here is some basic rules: Limited the tail rotor headspeed with in safety range, max. is 12000rpm Too high headspeed will CAUSE…

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The default angle of the tail rotor is 6 degree when the tail pitch slider is in center position. It gives an offset to the tail rotor to cancel the reaction torque generated by the main rotor within limited moving range. For example, traditional design of tail rotor have a range of…

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