This is probably one of the smallest multirotors with brushless motors. It measures only 7.3 cm diagonally from motor to motor. It's less than a Tiny Whoop! This device is a miniature jewel. But what is it really worth?
Tour of the owner
The structure of the X73S is reduced to its strict minimum: no carbon arms, the device is made of a single electronic plate including the flight controller and the ESC. A spartan architecture, reminiscent of what is found inside nano multirotor type Cheerson CX-10. The engines are models 1103 to 10000KV a bit special. They are placed upside down, base screwed up ... yet the propellers are positioned on the top. In fact, the motor shaft does not come out from the usual side, but from the side of the base! The propellers are transparent quadripales 4.6 cm in diameter, so 1.8 inches that sink on the shaft without screws. A support for the camera and the battery, in two parts, takes the main plate in sandwich. Below, the battery holder (not supplied) is a nacelle. It allows to slide batteries of 2.4 cm in width and 0.8 cm in thickness, with a plug of type Molex 2.0. Under the nacelle, it is a kind of foot, or base, which is used to lay the X73S on the ground. An important element, as we will see!
Continuation of tour
Above the plate is the camera combo - video transmitter, the micro receiver radio - a FrSky version on the device I bought. The FPV combo is a model close to the CM25 AIO, based on a 600TVL camera associated with a 5.8 GHz transmitter of 25 mW and 32 channels. It is protected by a plastic case and presented vertically compared to competing models. But the image is in the right direction. The antenna is of the dipole type fixed with a pigtail connector. Interesting, as it can act as a fuse in case of crash, and facilitate the change of antenna if necessary. To choose the transmission frequency, there is a dips box on the back of the combo. The whole weighs, with the propellers but without the battery, 31.21 grams. Not bad ! What battery is needed? The technical data sheet indicates that the recommended model is a Lipo 1S 600 mAh. Be careful, many batteries with these characteristics exceed the size of the nacelle!
Before taking off
The flight controller of the version I chose is a Naze32 flashed with Betaflight. No USB port on the plate, but a small connector. The manufacturer provides a cable to connect this connector to a USB port. The settings of Betaflght (version 3.0.1) are factory-made, including PID. All that remains is to pair the radio receiver with the radio control. On the FrSky version that I have, you need a radio compatible with D8 mode. A button on the receiver, easy to access, allows to start the pairing procedure. At first, do not try to modify the settings, rates and PID, they are very well chosen. On the other hand, it is essential to ensure that all the channels of the radio are correctly associated, that the arming is configured, as well as the flight modes (Horizon, Angle, Acro, Airmode). Do not forget to configure the Failsafe. In case of loss of radio link without automatic shutdown of the engines, outside, you will never find your machine!
First take-off
As usual, our first flight is made in direct view, as a precaution. And it was better! Once the engines are armed and the gases are pushed, one of the propellers will not rotate. The reason ? It is too pushed on its shaft and touches the components of the engine arm! It must be removed and reinserted less deeply. Second attempt ... and new failure. This time, it is the radio antenna that blocks a rear propeller. Third attempt: the X73S turns immediately. The faulty is the power cable that blocked an engine. Fourth attempt, the engines start and the X73S lies down on the side. The reason ? He lost to takeoff, two engines hit the ground. As the motors are reversed, the rotating part is down. It is therefore important to ensure that the X73S is placed on a perfectly flat surface and does not take a tilt at take-off. The solution is to put it on a flat support and to push the gases frankly. The device is very reactive, quite nervous: it must be contained so that it does not leave too fast. Note that diodes are placed just after the ESCs on the motor arms, just below the propellers. The transparency of the propellers does the rest: they are illuminated in flight. Great!
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