Surpass Hobby 3665 3500KV Brushless Inrunner Motor – 5 mm Shaft, Black & Red

Surpass Hobby SP‑036650‑06 S23B03 3665 3500KV Brushless Inrunner Motor – 5 mm Shaft, Black & Red

The SP‑036650‑06 S23B03 is a compact but extremely capable 3665‑size 3500KV inrunner designed for high‑performance RC use in both 1/10–1/8 cars and EDF aircraft that require strong RPM, efficient torque delivery, and stable thermal behaviour. Its 4‑pole rotor, hardened 5 mm shaft, and black‑and‑red aluminium housing give it the durability and punch needed for aggressive driving and high‑RPM flight. With a maximum current rating of 92 A, maximum voltage of 13 V (3S LiPo), and power capability of 1200 W, this motor delivers a lively, responsive powerband while keeping weight low at 261 g. Pre‑installed 4 mm gold bullet connectors ensure compatibility with most high‑current ESCs.

Performance in RC Cars

The 3500KV rating gives this motor a fast, high‑revving character ideal for lightweight 1/10 and mid‑weight 1/8 builds. Its 92 A current ceiling and 1200 W output allow strong acceleration and excellent top‑end speed on 3S LiPo. This makes it well‑suited to:

• 1/10 on‑road touring and drift cars
• 1/10 rally and buggy platforms
• Lightweight 1/8 GT and buggy builds
• Speed‑run setups where high RPM is preferred over brute torque

The 3665 can size keeps weight down while still offering enough thermal mass for extended running.

Performance in EDF Aircraft

The electrical limits and inrunner design make this motor a good match for medium‑size EDF systems that require high RPM and efficient airflow. Its specifications align well with:

• 70 mm EDF units (ideal match)
• 80 mm EDF units depending on rotor load
• Lightweight single‑EDF jets
• 3S EDF setups needing high KV and strong RPM

The 5 mm shaft fits many 70–80 mm EDF rotors, and the 13 V max voltage matches 3S EDF power systems. The 1200 W power rating provides enough thrust capability for fast, responsive flight without excessive heat buildup.

Key Features

• 3665‑size brushless inrunner
• 3500KV rating for high RPM and responsive throttle
• Maximum current: 92 A
• Maximum voltage: 13 V (3S LiPo)
• Maximum power: 1200 W
• Weight: 261 g
• Pre‑installed 4 mm gold bullet connectors
• 5 mm hardened steel shaft
• Black and red aluminium housing
• 4‑pole rotor for efficient torque delivery
• Suitable for 1/10–1/8 RC cars and 70–80 mm EDF jets
• Ideal for 3S high‑RPM applications