Surpass Hobby Supersonic F540/F550 4-Pole Waterproof Sensorless Inrunner Brushless Motor for 1/10 RC On-Road, Off-Road, Short Course & Crawler DJ009

Product Introduction

• Surpass Hobby F540/F550 series are 4-pole 12-slot waterproof sensorless inrunner brushless motors engineered for full-range 1/10 scale RC vehicles, covering on-road cars, buggies, short course trucks and crawlers. Multiple KV options cater to low-speed high-torque crawling and high-speed racing applications. Equipped with rear built-in TEMP sensor port for overheat protection when paired with matched thermal-control ESC. Featuring annular finned aluminum can and fully sealed waterproof construction, it is a popular stock upgrade replacement for most 1/10 RC models.

Basic Information

• Brand: Surpass Hobby (Rocket RC)
• Model: F540 / F550
• Applicable Vehicles: 1/10 RC on-road, off-road, short course, monster & crawler vehicles
• F540 available KV: 3100KV, 3600KV, 3930KV, 4370KV
• F550 available KV: 3000KV, 3350KV, 3800KV, 4500KV

Dimension & Weight

• Uniform outer diameter: 35.8mm; standard 3.175mm output shaft with 15mm exposed length; six universal M3 mounting holes for standard 540 motor mount.
• F540: Total length 50mm, net weight 183g
• F550: Total length 58mm, net weight 219g
• Factory pre-soldered 4mm gold-plated banana plugs on motor leads.

Electrical Specifications

• F540: Max voltage 17V, peak power 820W, peak current 48A~68A, max no-load RPM 50000; standard for 2S~3S LiPo
• F550: Max voltage 21V, peak power 1400W, peak current 67A~108A, max no-load RPM 60000; high-KV versions support up to 4S LiPo
  Both motors adopt 4-pole 12-slot winding design with rear integrated temperature sensor port compatible with dedicated thermal-regulated ESC.

Construction & Materials

• Motor Can: CNC precision machined high-strength 6061-T6 aluminum with annular cooling fins for enlarged heat dissipation area, fully sealed for waterproof performance.
• Stator & Winding: High-temperature pure copper windings paired with 0.35mm thick silicon steel laminations to cut internal resistance and operational heat.
• Rotor: Explosion-proof 4-pole 12-slot silicon steel core fitted with high-density magnets, anti-demagnetization under high load.
• Output Shaft: High-toughness wear-resistant stainless steel, anti-bending; dual high-precision ball bearings at both ends for smooth low-noise rotation.
• Modular split structure: Easy disassembly to clean internal sand/mud for regular bearing and winding maintenance.

Key Features

• 4-pole 12-slot design delivers superior low-end torque and punchy startup compared to conventional 2-pole 540 motors, suitable for heavy-load crawling as well as high-speed on-road racing.
• IP-rated fully waterproof & dustproof housing allows reliable running on rainy days, shallow water and muddy terrain.
• Versatile KV selection: High KV (4370KV/4500KV) optimized for 2S LiPo high-speed on-road; medium & low KV (3000KV~3930KV) fit 2S~3S powered monster trucks and crawlers.
• Linked temperature control with matching ESC automatically limits output at excessive temperature to prevent magnet demagnetization and burnout.
• Standard 540 mounting dimension enables drop-in installation on stock motor mounts without chassis modification; pre-installed anti-oxidation gold-plated plugs for instant wiring.

Compatibility

• Fits all mainstream 1/10 RC chassis including short course, desert truck, buggy, on-road, crawler and monster truck from Axial, Traxxas, WLtoys, MJX and other popular RC brands.