Skystars F4 V2 + KO50A BLS Stack

The Skystars F4 V2 and KO50A stack delivers a robust 30.5x30.5mm powertrain tailored for 5-inch freestyle, racing, and mid-range FPV builds. Combining a reliable STM32F405 flight controller with a 50A BLHeli_S ESC, this setup provides ample current overhead for 6S motors without the premium price tag of 32-bit ESC alternatives.

Key features

• STM32F405 processor with 6 hardware UARTs for seamless integration of receivers, GPS modules, and HD video systems.
• Continuous 50A current handling (60A burst) via the KO50A BLHeli_S ESC, easily supporting modern 2207 and 2306 motor profiles.
• Dual onboard BECs (5V/3A and 10V/2A) to safely power power-hungry VTX units like the DJI O3 or Walksnail Avatar.
• 16MB onboard Blackbox flash memory for flight tuning and diagnostic logging.

Specifications

• Flight Controller MCU: STM32F405
• Gyro: BMI270
• Input Voltage: 3-6S LiPo
• Continuous Current: 50A
• Burst Current: 60A
• ESC Firmware: BLHeli_S (Supports Bluejay)
• BEC Output: 5V/3A, 10V/2A
• Blackbox: 16MB Flash
• Mounting Size: 30.5x30.5mm (M3 hole)
• Supported Firmware: Betaflight, INAV

This stack features an intuitive pad layout with a dedicated plug-and-play connector for digital HD systems alongside standard, well-spaced solder pads for analog builders, dropping cleanly into any standard 30-size frame.