Product overview
The FlashHobby Arthur 70A 32Bit ESC controls brushless motors in multirotor, fixed-wing and helicopter applications, with optimization directed toward multirotor operation. Its 21 × 42 mm dimensions and 9.52 g net weight define the component footprint for aircraft integration. The controller combines BLHELI_32bit firmware with a 32-bit ARM Cortex STM32F051 processor running at 48 MHz and 2048-level throttle resolution. Electrical integration must accommodate its 3–6S working range. The continuous current rating is 70 A, while the higher 75 A burst rating applies only for periods of ten seconds or less.
The physical construction combines a thickened six-layer PCB, a low-internal-resistance MOSFET and a dedicated MOS driver chip. An aluminum sheet covers the MOSFET to provide cooling, and twisted-pair signal wiring is intended to reduce crosstalk. Double voltage protection covers the microcontroller hardware, driver circuit and MOSFET. Built-in sensing addresses temperature, output power and output current, with programmable protection available. A current meter supports current indication through an on-screen display, adding a current-reporting capability alongside the controller’s motor-control functions and protective features.
Supported control signals include Dshot150/300/600/1200, PWM, Oneshot125/42 and Multishot, with Damped Mode also supported. PWM input frequency extends up to 500 Hz. The signal wire provides access for firmware upgrades and configuration changes. Programming with a USB linker enables forward and reverse throttle, bidirectional operation, FPV 3D mode, motor speed, braking and PWM-frequency settings. The onboard RGB LED has configurable color, and beep settings are also programmable. These adjustment capabilities depend on USB-linker use; the controller’s operating range and burst-duration limit remain constraints when selecting it for an aircraft propulsion system.
Specifications
| Specification | Value & conditions |
|---|---|
| Dimensions | 21 × 42 mm |
| Net weight | 9.52 g |
| Working voltage | 3–6S |
| Continuous current | 70 A |
| Burst current | 75 ABurst duration ≤10 seconds. |
| Supported control 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 microcontroller, 48 MHz; 2048-level throttle resolution |
| Sensing and protection | Built-in sensing of temperature, output power and output current; programmable protection |
| Firmware and configuration access | Firmware upgrades and configuration changesThrough the signal wire. |
| Current indication | Current meter supports on-screen-display current indication |
| Programmable motor-control settings | Forward/reverse throttle, bidirectional mode, FPV 3D mode, motor speed, braking and PWM frequencyWith a USB linker. |
| Programmable indication 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 motor-control applications; multirotor-oriented optimization |
| 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 |
| Circuit-board construction | Thickened six-layer PCB intended to reduce resistance and heat generation and improve current-surge tolerance |
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