Product overview
HOBBYWING P115M is an integrated coaxial propulsion system designed for firefighting tethered drones and heavy-lift cargo eVTOLs. It combines motors, electronic speed controllers and propellers in a dual-rotor assembly, with wiring concealed inside carbon tubes. Installation uses an 80 mm outer-diameter arm tube and accommodates arm thicknesses of 2–5 mm; wall thickness depends on the material, and the tube ends require specific mounting holes. Propeller options are the 64-inch MSC 64x23-P and 73-inch MSC 73x21-P quick-release carbon-fiber models.
The MSC 64x23-P configuration has a specified maximum thrust of 232 kg and weighs 19.6 kg ± 100 g, while the MSC 73x21-P configuration has a specified maximum thrust of 236 kg and weighs 21.2 kg ± 100 g. Both weights include cables and propellers, and both configurations have 115 kg rated thrust. P115M belongs to the 800 V battery-platform class, with a 500–850 V input range and 720 V rated voltage. PWM+CAN digital throttle is standard, with PWM+RS485 and CAN+RS485 available as options. Power distribution supports conventional high-voltage input or independent high- and low-voltage supplies with 24 V on the low-voltage side.
A high-voltage power distribution unit with external pre-charge is required because the ESCs lack built-in high-voltage pre-charge. Direct battery connection is prohibited because it produces severe capacitor-charging inrush current, risking sparks and reduced service life. Shared pre-charge uses fewer components, but a single ESC-bus short circuit or main-positive-circuit open circuit can cause total power loss. Independent pre-charge for each ESC requires a larger, heavier distribution unit. Preserving propulsion redundancy under these faults depends on disconnecting the fault through the main positive contactor and reporting it to the flight controller for power redistribution. The relay-coil 24 V supply must be electrically isolated from the high-voltage DC bus; after high-voltage power-on, ESC self-check must await flight-controller commands to avoid pre-charge resistor damage.
The system operates from −35 to 55 °C, with IPX5 protection for the assembly and motors and a separate IP67 rating for the ESCs. Pull-test figures were measured by HobbyWing's own laboratory at 25 °C and sea level with throttle input adjusted, and are for reference only. The P115M overload curve for MSC 64x23-P applies at 720 V with effective heat dissipation, 25 °C ambient temperature, sea-level altitude and consistent rotational speed. Overload duration requires strict monitoring against the curve's limits: exceeding them can cause irreversible overheating damage, and the propulsion system does not automatically shut down.
Specifications
| Specification | Value & conditions |
|---|---|
| Product identity | HOBBYWING P115M 800 V high-voltage coaxial drone propulsion system. |
| Intended applications | Firefighting tethered drones and heavy-lift cargo eVTOLs. |
| Physical architecture and integration space | Dual-rotor coaxial structure with concealed wiring; the manufacturer describes reduced arm length and increased effective payload space.Integration benefits; confirm installation requirements. |
| Integrated components | Integrated motor, electronic speed controller and propeller. |
| Arm thickness and propeller options | Arm thickness: 2–5 mm. Propeller options: 64-inch and 73-inch quick-release carbon fiber.Confirm arm material, mounting requirements and selected propeller configuration. |
| MSC 64x23-P system thrust and efficiency | Maximum thrust: 232 kg. Rated thrust: 115 kg. System efficiency: 5.4 g/W.MSC 64x23-P configuration. |
| MSC 73x21-P system thrust and efficiency | Maximum thrust: 236 kg. Rated thrust: 115 kg. System efficiency: 6.1 g/W.MSC 73x21-P configuration. |
| System input and rated voltage | Input voltage: 500–850 V. Rated voltage: 720 V.Both listed system configurations. |
| Tube outer diameter | 80 mm outer diameter.Wall thickness varies by material; tube ends require specific holes. Confirm detailed mounting specifications. |
| MSC 64x23-P system weight | 19.6 kg ± 100 g.MSC 64x23-P configuration; weight includes cables and propellers. |
| MSC 73x21-P system weight | 21.2 kg ± 100 g.MSC 73x21-P configuration; weight includes cables and propellers. |
| Power and signal cables | Power cable: 12 AWG × 2000 mm. Signal cable: 2200 mm.Both listed system configurations. |
| System operating temperature and ingress protection | Operating temperature: −35 to 55 °C. Ingress protection: IPX5.System-level specifications for both configurations; the ESC has a separate protection rating. |
| Signal cable assignments |
|
| System output power and DataLink version | Rated output power, maximum continuous: 18.3 kW. DataLink version: DataLinkBox G3.Both system configurations; rated output power is labeled maximum continuous. Confirm the supplied DataLink configuration. |
| ESC voltage, communication and dimensions | Rated voltage: 720 V. Communication: CAN, with customizable RS485. Dimensions: 211 × 104 × 67 mm without plug.ESC specifications; RS485 is customizable and dimensions exclude the plug. |
| ESC weight with cables | 1880 ± 50 g, including 12 AWG × 2000 mm power cable and 2200 mm signal cable.ESC weight includes the specified power and signal cables. |
| ESC current and ingress protection | Peak current: 45 A for 10 seconds. Continuous current: 15 A. Ingress protection: IP67.ESC peak current applies for 10 seconds; continuous current and ingress protection are separate ESC specifications. |
| ESC pulse-width qualification | The printed operating pulse-width field is marked not supported.The operating pulse-width heading explicitly states that it is not supported. |
| ESC throttle combinations, pulse width and logging | Dual throttle combinations: CAN+RS485 / CAN+PWM / RS485+PWM. Printed pulse-width range: 1100–1940 μs, marked not supported. Black-box log: 2–48 h.ESC specifications; the printed pulse-width range is qualified as not supported in its heading. |
| MSC 64x23-P motor stator, KV and output | Stator size: 156 × 50 mm. KV: 5.5 KV. Rated output power, maximum continuous: 9.1 kW per motor.MSC 64x23-P configuration; output is maximum continuous per single motor. |
| MSC 73x21-P motor stator, KV and output | Stator size: 156 × 60 mm. KV: 5 KV. Rated output power, maximum continuous: 8.4 kW per motor.MSC 73x21-P configuration; output is maximum continuous per single motor. |
| Motor diameter, slots and poles, and protection | Diameter: 167.1 ± 0.1 mm; with fan: 209.9 ± 1 mm. Slot/pole designation: 36N42P. Ingress protection: IPX5.Both motor configurations; the larger diameter includes the fan. |
| MSC 64x23-P motor weight | 5420 g with a 70 mm enameled-wire outlet.MSC 64x23-P motor weight includes cable; enameled-wire outlet length is 70 mm. |
| MSC 73x21-P motor weight | 6090 g with a 70 mm enameled-wire outlet.MSC 73x21-P motor weight includes cable; enameled-wire outlet length is 70 mm. |
| MSC 64x23-P propeller specification | Model: MSC 64x23-P. Weight: 1035 ± 20 g. Material/type: carbon unfolding propeller. Mounting designation: D60-6×M6; center hole D20. |
| MSC 73x21-P propeller specification | Model: MSC 73x21-P. Weight: 1254 ± 20 g. Material/type: carbon unfolding propeller. Mounting designation: D60-6×M6; center hole D20. |
| Default and optional throttle configuration | Default: PWM+CAN digital throttle. Optional: PWM+RS485 or CAN+RS485.Distinguish the default arrangement from optional combinations when specifying the supplied assembly. |
| Power distribution options | Conventional high-voltage input or independent high- and low-voltage distribution with 24 V low voltage.Confirm the selected power distribution configuration. |
| Performance qualifications and overload limitation | Monitor overload duration against the stated limits. Exceeding them can cause irreversible overheating damage; the propulsion system does not automatically shut down.The overload curve concerns P115M with MSC 64×23-P at 720 V, with effective heat dissipation, 25 °C ambient temperature, sea-level altitude and consistent rotational speed. Pull-test figures are laboratory reference values measured at 25 °C and sea level with throttle input adjusted. |
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