RadioLink Electronic Limited
2
Chapter 1 Features of F121 Pro
As the mini racing drone that can fly at high speed at Altitude Hold Mode, F121 Pro is very easy to master for
drone freshman. The inertial navigation system technology blending Kalman filtering, gyro, accelerometer, and
barometer makes F121 Pro possible to flight through narrow space with accuracy and hold altitude even it’s less
than ten centimeters height to the surface or at high speed.
F121 Pro have three flight modes that AltHold Mode, Stabilize Mode and Manual Mode. Even beginners can
flight stably at the first trial at AltHold Mode.
F121 Pro is monitored by RadioLink mini racing drone flight controller F121, which is different from other flight
controllers with PID needs to be set before use, will tune automatically. The software noise reduction technology
not only enables a more pleasant flight but also makes the motors more responsive and more efficient than
traditional 8520 brush-less motors. It can be thrown and start to fly at any angle even under high-speed and
remains stable even facing with sudden airflow fluctuations such as during takeoff, under braking, or after
extended flying. Without compass locking, F121 Pro always automatically modify angles during flight.
Chapter 2 Before Flight
2.1 Power Supply
Power for transmitter T8S
: Make sure the transmitter is fully charged.
Power for F121
: The voltage of 1S LiPo battery packed with F121 Pro by default is not fully charged so the
battery needs to be charged with the charger CM120 before flight.
The LiPo battery charger CM120, specially designed for 1S LiPo battery, sharing the professional development
and high precision of CB86PLUS, ensures safer charging and battery life span.
Charging current can be set as 1A or 2A by toggling the switch at the side of the charger.
The Red LED always on indicates the battery is under charging. The Green LED always on indicates the battery
is fully charged. The Red and Green LED Flashing alternately indicates fault prompt.
CM120 applies general USB connector, both computer and power bank for mobile phone can be used with
CM120.
Note
Voltage output of power supply should be NO higher than 5V.
2.2 Transmitter
The two joysticks of T8S correspond to the four basic channels respectively. The below example takes RadioLink
radio T8S Mode 2 (Throttle on the left stick).
Left joystick
Make the F121 Pro rise or descend by toggling the left stick (THROTTLE) vertically upward or downward and
turn clockwise or anticlockwise by toggling the left stick (YAW) to the left or right.
Right joystick
Make the F121 Pro fly forward or backward by toggling the right stick (PITCH) vertically upward or downward and
to left or right by toggling the right stick (ROLL) to the left or right.
