RadioLink F121 Mini Racing Quadcopter with Camera and VTx (No Transmitter)

The RadioLink F121 Mini Racing Quadcopter (Part No: RLKV011003) is a professional-grade micro FPV drone designed for education, training, and indoor racing. This specific version comes without a transmitter, making it an ideal "Bind-and-Fly" (BNF) addition for pilots who already own a RadioLink T8S or AT series radio. Despite its toy-like 121mm size, it features an advanced inertial navigation system that makes it remarkably stable for beginners while remaining agile enough for seasoned FPV pilots.

Key Features:

• Inertial Navigation & Altitude Hold: The CS360 Flight Controller uses a fusion of Kalman filtering and an inertial navigation algorithm (gyro, accelerometer, and barometer). This allows the F121 to hover with precise altitude hold even in narrow spaces or when flying just 10cm above the ground.
• Integrated 5.8GHz FPV System: Equipped with a 25mW/100mW/200mW switchable video transmitter and a high-resolution 800TVL camera. It transmits a real-time 5.8GHz signal to any standard FPV goggles or monitors.
• Propeller Protection: Features a patented, high-strength clip-on guard design. Unlike friction-fit guards, these are secured directly to the carbon fiber frame, protecting the 8520 coreless motors from impact and preventing wire damage during crashes.
• Three Flight Modes:
  • Low-Speed Alt-Hold: Maximum stability for absolute beginners.
  • High-Speed Alt-Hold: Increased tilt angles for faster movement while maintaining height.
  • Stabilize Mode: Full manual control (Self-leveling) for FPV racing and acrobatics.
• Throw-and-Fly Capability: The specialized rotation vector algorithms allow the drone to be tossed into the air at any angle; it will automatically level itself and begin hovering.

Technical Specifications:

Expert Setup Tip:

The F121 is unique because its flight controller uses "Auto-Tune" logic. Pro-Tip: If the drone feels "jittery" after a hard crash, check the GEMFAN 65mm propellers for tiny nicks or bends. Because this quad relies on high-speed vibration filtering (Kalman filtering), even a slightly unbalanced prop can confuse the sensors. Replacing props (RLKA001017) usually restores that "locked-in" factory feel immediately.

Transmitter Compatibility: This model is a "No Transmitter" version. To fly, you will need a RadioLink T8S, T8FB, AT9S Pro, or AT10II. Ensure your radio is bound to the internal R8SM receiver and set to S-Bus mode (Purple/Blue LED on the receiver).