Product overview
The FlashHobby Arthur40A 32bit ESC is a brushless motor-control component for RC racing multirotors, with additional support for fixed-wing aircraft and helicopters. Its slim body measures 11 × 34.5 mm and has a net weight of 6.4 g, defining a compact integration footprint. The physical architecture combines a six-layer thickened PCB, a low-resistance MOSFET and a dedicated MOS driver chip. An aluminum sheet covers the MOSFET for cooling, while the twisted-pair signal wire is intended to reduce crosstalk during signal transmission.
The controller uses a 32-bit ARM Cortex STM32F051 processor running at 48 MHz, with 2048-step throttle resolution and BLHELI_32bit firmware. Its electrical operating range is 3–6S, with a continuous current rating of 40 A. The higher 45 A burst rating applies for ten seconds or less. Control inputs include Dshot150/300/600/1200, PWM, Oneshot125/42 and Multishot, alongside Damped Mode support. PWM input is supported up to 500 Hz, providing a specific frequency limit for integration with the aircraft's control electronics.
Firmware upgrades and configuration changes can use the signal wire. With a USB linker, configurable functions include forward/reverse throttle, bidirectional operation, FPV 3D mode, motor speed, braking, PWM frequency and an inlet angle speed setting. The onboard RGB LED color and beep settings are also programmable. Built-in sensing covers temperature, output power and output current, with programmable protection. A current meter supports on-screen-display current indication, and double voltage protection covers the MCU hardware, driver circuit and MOSFET.
Specifications
| Specification | Value & conditions |
|---|---|
| Product | FlashHobby Arthur40A 32bit ESC |
| Product purpose | Slim brushless electronic speed controller for RC racing multirotors |
| Size | 11 × 34.5 mm |
| Net weight | 6.4 g |
| Working voltage | 3–6S |
| Continuous current | 40 A |
| Burst current | 45 ABurst duration of 10 seconds or less. |
| Supported signals and mode | Dshot1200/600/300/150, PWM, Oneshot125/42, Multishot and Damped Mode |
| Firmware | BLHELI_32bit |
| Processor and throttle resolution | 32-bit ARM Cortex STM32F051 MCU; 48 MHz; 2048-step throttle resolution |
| Sensing and protection | Built-in sensing of temperature, output power and output current, with programmable protection |
| Firmware and configuration access | Firmware upgrades and configuration changes through the signal wireThrough the signal wire. |
| Current indication | Current meter for on-screen-display current indication |
| Programmable motor-control settings | Forward/reverse throttle, bidirectional mode, FPV 3D mode, motor speed, braking, PWM frequency and inlet angle speed settingWith a USB linker. |
| Programmable light and sound settings | Onboard RGB LED color and beep settingsWith a USB linker. |
| PWM input frequency | Up to 500 Hz |
| Aircraft applications | Multirotor, fixed-wing and helicopter applications |
| Control system | Self-adapting control system |
| Signal wiring | Twisted-pair signal wire intended to reduce crosstalk |
| Voltage protection | Double voltage protection for the MCU hardware, driver circuit and MOSFET |
| Power-stage construction | Low-internal-resistance MOSFET and dedicated MOS driver chip |
| Cooling construction | Aluminum sheet covering the MOSFET for cooling |
| PCB construction | Six-layer thickened PCB |
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