HappyModel Crazybee F4 Pro V2.1 Brushless Whoop Flight Controller for Sailfly-X (CHOOSE RX TYPE)

4.0 star rating 2 Reviews

Regular price $36.99 Sale

Availability: Available Unavailable

Product SKU: 1D-6610-PNP

Product Details

This is the 2.1 Version of the Happy model Crazy bee F4 board that is used
in the Happymodel Sailfly drone.
It plugs to the Happy model VTX via the connector without the need of soldering.



  • Input Voltage: 2-3S 
  • Current: 5A continuous peak 6A (3 seconds)
  • Dimensions: 28.5x28.5mm
  • Weight: 4.3g 

Flight Controller

  • MCU: STM32F411CEU6 (100MHZ, 512K FLASH)
  • Sensor: MPU-6000(SPI Connection)
  • Built-in 5A(each) Blheli_S 4in1 ESC Dshot600 Ready
  • ESC MCU Upgraded to EFM8BB21
  • Built-in Betaflight OSD (SPI Control)
  • Built-in Current meter sensor Max up to 28A (Scale set to 1175)
  • Built-in 5V 1A Buck / Boost w/ LC Filter
  • Built-in Voltage Detection
  • BLHELI_S Pass-Through Ready
  • Multi Serial Port Support
  • Frsky Version: Built-in SPI Frsky Receiver w/ Telemetry (D8/D16 switchable)
  • Flysky Version: Built-in SPI Flysky Receiver w/ Telemetry (AFHDS/AFHDS-A Compatible)
  • DSMX Version: Built-in Serial-Based DSM2/DSMX Compatible Satellite Receiver (Default RX2 was used for DSM2/DSMX receiver)
  • No RX version: Supports External Serial-Bus Receiver (Like XM+, Crossfire, S-HSS and DSM2/DSMX, IBUS protocol etc.)

4in1 ESC

  • Current: 5A Continuous, 6A Peak (3 seconds)
  • Onboard 4in1 ESC MCU Upgraded to EFM8BB21
  • Support BLHeliSuite Programmable
  • Factory firmware: S_H_50_REV16_7.Hex
  • Default protocol: DSHOT600


  • 1x Crazybee F4 PRO V2.1 Flight Controller
  • 1x XT30 Pigtail
  • 1x 5pin-5pin SH1.0 Plug (to connect w/ Whoop_VTX or Diamond_VTX)
  • 1x 2x1S PH2.0 Series Connection Power Pigtail 
  • 1x Rubber Damping Ball Set 

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