Compact F405 stack for smaller FPV frames
This 20×20 stack combines the SpeedyBee F405 Mini controller with the BLS 35A Mini V2 ESC. It is designed for compact builds that need a 3–6S power system, USB-C configuration and analog OSD without moving to a full-size 30×30 stack.
Key specifications
- FC: STM32F405 processor, ICM42688P gyro, barometer, AT7456E OSD and 8MB Blackbox memory
- ESC: 35A continuous / 45A burst per channel; BLHeli_S J-H-40; DShot300/600
- Power: 3–6S LiPo input; 5V/2A and 9V/3A BEC outputs
- Setup: USB-C plus Bluetooth configuration through the SpeedyBee app
- Mounting: 20×20 mm with 3.5 mm holes; M2/M3 hardware compatible
- Digital video wiring: solder-pad support for DJI O3, RunCam Link, Caddx Vista and DJI Air Unit V1
Selection guidance
Use this stack where a 20×20 pattern and 35A current capacity match the motor, propeller and battery combination. Verify 20×20 clearance, choose the correct M2 or M3 grommets, and do not rely on ESC telemetry because the bundled BLS ESC does not provide it.
Availability note: This is a legacy product line. Contact 100drone before ordering if you require current-batch or replacement availability.