SP3 Racing F3 flight controller — STM32F303, MPU6050, for quadcopter and hexacopter

The SP3 Racing F3 is a high-performance flight controller built around the STM32F303 microcontroller — a next-generation 32-bit ARM CPU with a hardware floating-point unit (FPU) running at 72MHz. Designed for FPV racing quadcopters and hexacopters, it delivers precise, low-latency flight control in an extremely lightweight 6-gram package. The Acro version ships without a compass or barometer, keeping weight and cost minimal for pure racing and freestyle builds.

Key Specifications:

• CPU: STM32F303 @ 72MHz with hardware FPU
• IMU: MPU-6050 6-axis accelerometer and gyroscope
• Weight: ~6 grams (without casing)
• USB: Micro USB (for configuration and firmware flashing)
• Firmware: Cleanflight / Betaflight compatible
• Acro version: no compass, no barometer (racing/freestyle optimised)

I/O Connectivity:

• 2×8 pin JST-SH sockets — PPM, PWM, Serial RX, GPIO, ADC, 3.3V, 5V, GND
• 8×3 pin through-holes for ESC/servo connections
• 2×4 pin through-holes for 2× serial ports (UART)
• 1×2 pin through-holes for battery voltage input
• 1×2 pin through-holes for buzzer
• 1×4 pin JST-SH socket for I2C (compass, barometer add-ons)
• 1×4 pin JST-SH socket for SWD debugging

Receiver Compatibility:

• PPM receivers
• PWM receivers
• Serial RX (SBUS, IBUS, Spektrum DSM2/DSMX)

Applications:

• FPV racing quadcopters (250, 210, 180 class)
• Freestyle quadcopters
• Hexacopters and custom multi-rotor builds
• Cleanflight / Betaflight development and tuning

Note: This is the Acro version — no onboard compass or barometer. GPS-assisted flight modes require external modules connected via I2C or UART.