SpeedyBee F405 V4 BLS 55A Stack — Universal Stack for 7-8 Inch Drones

Brand: SpeedyBee. Product Type: Drones & Quadcopters > Stacks (FC+ESC). This kit combines the SpeedyBee F405 V4 Flight Controller and the SpeedyBee BLS 55A 4-in-1 ESC, designed for pilots from beginners to professionals who need reliability, easy configuration, and broad compatibility with modern video systems.

Description and Key Features: The stack is supplied as an electronics kit for FPV drones, recommended for 7–8 inch frames. The flight controller is based on the powerful STM32F405 processor and equipped with a high-precision ICM42688P gyroscope and a barometer for accurate stabilization. The FC supports up to 6 UART ports, has a built-in Bluetooth module for wireless configuration via the SpeedyBee mobile app, and a microSD card slot for Blackbox logging. The BOOT button allows changing LED lighting modes without entering the configurator.

The 55A BLS ESC for each motor is equipped with a BB21 microcontroller, supports DSHOT300/600 protocols, can be flashed with Bluejay for RPM filtering, and is also compatible with BLHeli_S. The ESC has TVS diodes for protection against voltage spikes.

Compatibility and Power

Support for 3–6S LiPo batteries makes the stack universal for various classes of aircraft. For powering peripherals, 9V/3A and 5V/3A outputs are provided, as well as 3.3V and a special 4.5V output. Full compatibility with DJI Air Unit (including O3, Vista, Link) ensures connection without changing cable wiring.

Functionality and Configuration

Supports Betaflight and INAV, allows controlling LED lighting with mode switching via the BOOT button, and enables flashing the ESC and FC via the SpeedyBee app or standard configurators (Betaflight configurator, ESC Configurator). The FC has a USB Type-C interface for firmware updates and entering DFU mode.

Physical Parameters and Mounting

Compact and robust form factor with a 30.5×30.5 mm mounting pattern (specified in the stack's specifications). The product name also indicates 30x30 mounting and suitability for 7–8 inch drones — please check compatibility with your frame before installation.

Advantages

• Versatility: compatibility with various video systems and 3–6S LiPo batteries.
• Easy Configuration: built-in Bluetooth and SpeedyBee App support.
• Reliability: TVS diodes on ESC, high-precision ICM42688P gyroscope.
• Flexible Connections: 8-pin cable or direct soldering.
• Ability to flash ESC to Bluejay for RPM filtering.

How to Use?

User Manual

Installation and Update Recommendations

• The flight controller should be placed on the top level, and the ESC on the bottom to ensure optimal access to connectors and cooling.
• The FC and ESC can be connected via the included 8-pin cable or by direct soldering according to the diagram in the manual.
• Parameter settings are done via the SpeedyBee app or the Betaflight/INAV configurator on a PC.
• To update the FC firmware, connect the controller to a computer via USB Type-C and use DFU mode. The ESC is configured via the SpeedyBee App or ESC Configurator.

Package Contents

The kit includes: 1 x SpeedyBee F405 V4 Flight Controller; 1 x SpeedyBee BLS 55A 4-in-1 ESC; 1 x 35V 1000uF Low ESR capacitor; 1 x XT60 power cable (70 mm); 1 x DJI 6-pin cable (80 mm); 1 x SH 1.0 mm 8-pin cables 25 mm and 75 mm; 1 x M3 nylon nuts; 1 x M3 silicone O-rings; 1 x M3*8 mm silicone grommets for FC; 1 x M3*8.1 mm silicone grommets for ESC; 1 x M3*30 mm hex screws.

If you are looking for a reliable, functional, and flexible stack for a 7-8-inch FPV drone — the SpeedyBee F405 V4 BLS 55A 30x30 FC+ESC Stack will be an excellent choice thanks to its powerful hardware solutions, convenient configuration channels, and full compatibility with the most popular video modules and flight configurations.

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