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The SpeedyBee F405 V4 stack is described as an updated version of the popular stack with a BLS 55A 4-in-1 ESC, an STM32F405 MCU and an ICM42688P gyroscope for more precise control.
The specification list gives an AT7456E OSD chip, 3S-6S LiPo input, a 30.5 x 30.5 mm mounting pattern with 4 mm holes, Bluetooth with MSP, a MicroSD slot, six UARTs and DSHOT300/600. The page lists ESC current as 60A x 4 continuous with an 80A burst for 10 seconds, which does not match the 55A in the title, so use the figures as printed. The page marks the product as discontinued (SKU RS7364).
STM32F405 MCU: with ICM42688P gyroscope.
BLHeli_S 4-in-1 ESC: DSHOT300/600 protocol.
Bluetooth (MSP enabled): for wireless configuration.
30.5 x 30.5 mm mounting: with 4 mm holes.
Type-C USB and MicroSD slot: as listed.
DJI Air Unit compatible: via the 6-pin connector or solder.
A flight controller is the brain of a multirotor or fixed-wing aircraft. It reads the gyroscope, and where fitted the accelerometer, barometer and compass, and runs a control loop that compares what the aircraft is doing with what the pilot asks for. It then sends new speed commands to the motors through the ESCs or servos many times each second. A faster processor and a better gyro allow a higher loop rate and a more locked-in feel.
Wiring and firmware decide what the board can do. The number of UARTs limits how many receivers, GPS units, telemetry radios and video systems you can connect, the PWM or motor outputs limit how many motors and servos it can drive, and the input voltage range must suit your battery and power module. Before you buy, check that the firmware you want to run supports the board and that its mounting pattern fits your frame.
Set up carefully. Flash a firmware that is listed as supported, configure the receiver protocol, set the motor order and direction, calibrate the accelerometer and, for larger aircraft, the compass, and always test with the propellers removed first. Keep the board isolated from vibration with soft mounts where the design calls for them, and never power it with a supply that is outside the rated input voltage.
Keep the aircraft safe. Confirm your failsafe settings and arming switch before the first flight, keep a backup of your configuration, and update firmware only when you have a reason to. A flight controller is a safety-critical part, so use the wiring diagram from the maker and avoid guesswork with power connections.
FPV freestyle builds
30x30 stack frames
DJI Air Unit builds
Bluetooth tuning
3S-6S power systems
The page lists compatibility with the DJI Air Unit through a 6-pin connector or solder pads. The mounting pattern is 30.5 x 30.5 mm with 4 mm holes.
The page does not itemise the package contents, and it marks the product as discontinued, so confirm availability first.
Flight controller MCU: STM32F405
Gyroscope: ICM42688P
USB port: Type-C
OSD chip: AT7456E
Power input: 3S-6S LiPo
ESC continuous current: 60A x 4 (as printed)
ESC burst current: 80A (10 sec)
ESC firmware: BLHeli_S J-H-40
ESC protocol: DSHOT300/600
Mounting size: 30.5 x 30.5 mm (4 mm holes)
Bluetooth: supported (MSP enabled)
MicroSD slot: supported
UARTs: 6
1 x SpeedyBee F405 V4 FC and 4-in-1 ESC stack
Freestyle builders who wanted a 30x30 stack with Bluetooth tuning.
An STM32F405.
ICM42688P.
3S-6S LiPo.
Yes, with MSP.
The page marks it as discontinued.
| Brand | SpeedyBee |
|---|---|
| Input Voltage | 3S-6S LiPo |
| MCU / Processor | STM32F405 |
| OSD Chip | AT7456E |
| Selling unit | PCS |
