This is the Eachine builder, active in recent weeks, which has a tiny camera taking the principle of Blade Nano QX, adding the possibility of flying on the back. Eachine X4 is one kind of mini rc quad with 4CH 6 Gyro.
Inverted flight is made possible by the rapid reversal of motor rotation. The propellers are balanced for it to be able to rotate in the direction of clockwise or counterclockwise without. The dimensions are 17.3 x 17.3 cm to 3.6 cm in height. The battery is a 3.7V 350 mAh Lipo 1S offering between 5 and 7 minutes of flight.
The question is how fast the unit managed to reverse the direction of rotation of the propellers - it is important that the passages of the normal inverted flight are the most fluid possible. Is also expected whether brushed motors manage to fit in with the duration of high stress. Note that the protections propeller-camera permit to land on the back without damage. Perfect for training flight back without risking breakage.
The date of availability was not disclosed by the manufacturer. This type of rc quadcopters should be sold at about $24.99 Banggood (with the port but excluding taxes) with a radio control in mode 1 or 2 (to be confirmed), with a canopy red and black or white and yellow ...
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