Hobbywing SEAKING 3660SL V2 2600KV Brushless RC Boat Motor for 2-4S

Upgrade your RC boat propulsion system with the Hobbywing SEAKING 3660SL V2 2600KV Brushless RC Boat Motor. This 4-pole, sensorless marine motor combines a water-cooling jacket, precision CNC aluminum construction, and a smooth power delivery design for high-performance electric RC boats.

Designed for 2S–4S LiPo setups and RC boats up to 80cm (31.5 inches) in length, the SEAKING 3660SL V2 pairs with the Hobbywing SEAKING 90A V4 ESC to create a coordinated brushless marine power system.

Hobbywing SEAKING 3660SL V2 2600KV Specifications

Note: Motor body dimensions exclude the water-cooling jacket, hose fittings, and protruding shaft. Check the official dimensional drawing for complete installation clearance. The 8.4A specification is no-load current, not maximum operating current.

Built for High-Performance RC Boat Power Systems

A marine motor must handle more than a quick burst of acceleration. Propeller load changes as the boat accelerates, turns, and encounters different water conditions. Sustained running also places continuous demands on the motor and its cooling system.

The SEAKING 3660SL V2 uses a 4-pole brushless inrunner design with a 2600KV rating, giving RC boat builders a practical foundation for 2S, 3S, and 4S propulsion configurations. Its sensorless design and construction support responsive acceleration and stable operation when matched with the correct ESC and propeller.

Smooth Startup and Responsive Throttle Control

The motor is developed for smooth startup and strong power delivery. When combined with a compatible marine ESC, it provides a flexible platform for tuning throttle response and acceleration to match the boat's intended use.

Designed for Boats Up to 80cm

Hobbywing specifies the 3660SL V2 2600KV for RC boats measuring up to 80cm in length. It is suitable for consideration in performance speedboat projects, brushless marine builds, and compatible replacement motor installations.

Hull length is an application guideline rather than a universal guarantee of compatibility. Propeller diameter, pitch, drivetrain resistance, hull weight, and battery voltage must also be considered.

Advanced Water-Cooling Design

Consistent cooling is essential in a high-output brushless RC boat motor. The SEAKING 3660SL V2 incorporates a water-cooling jacket designed to transfer heat away from the motor during operation.

• Internal water circulation: Directs cooling water through the surrounding jacket to help remove motor heat.
• CNC-machined cooling fins: Increase the external surface area available for heat transfer.
• Fan blade-shaped end-cap openings: Add a distinctive ventilation design to the motor assembly.
• Extended-run cooling support: Helps manage operating temperature when the boat's water-cooling circuit is functioning correctly.

Premium Construction for Marine Use

The SEAKING V2 series combines precision machining and selected internal materials to improve mechanical durability and support reliable power delivery.

• CNC aluminum housing: Provides a rigid structure and accurate component alignment.
• High-temperature copper windings: Designed to tolerate the thermal demands of brushless motor operation.
• Ultra-thin silicon steel laminations: Support efficient magnetic operation within the stator.
• Kevlar-wrapped rotor: Reinforces the rotating assembly for demanding operation.
• Precision output shaft and quality bearings: Support consistent rotation and mechanical stability.
• Serviceable construction: Allows inspection, cleaning, and maintenance following the manufacturer's instructions.

These construction details make the 3660SL V2 a strong candidate for builders who prioritize cooling design, dimensional accuracy, and long-term serviceability when selecting a marine brushless motor.

Recommended ESC: Hobbywing SEAKING 90A V4

Hobbywing identifies the SEAKING 90A V4 ESC as the recommended speed controller for the 3660SL V2 2600KV motor.

Matching a marine motor with an appropriate ESC is important for throttle control, battery voltage compatibility, motor direction, and protection settings. The SEAKING V4 platform is designed to work with Hobbywing's corresponding marine brushless motors.

This motor supports 2S–4S LiPo batteries. Before selecting a propeller or increasing battery voltage, make sure the complete propulsion system operates within the ESC, battery, motor, and drivetrain limits.

Explore compatible marine speed controllers in the Hobbywing SEAKING ESCs collection.

2600KV vs 3400KV: Which SEAKING 3660SL V2?

The SEAKING 3660SL V2 family includes two KV configurations. Although both use the same general 3660 motor format, their official supported LiPo ranges differ.

Choose 2600KV if your build requires the manufacturer's supported 2S–4S voltage range. The 3400KV version has a higher theoretical no-load RPM per volt but is officially rated for 2S–3S LiPo operation.

A higher KV number does not automatically mean a faster boat. Actual performance depends on propeller load, hull design, drivetrain efficiency, battery voltage, and available current.

Installation, Motor Mounting & Wiring

1. Confirm Motor Mounting Dimensions

The 3660SL V2 uses six M3 threaded mounting holes with a specified hole depth of 6mm. Check the motor mount, screw diameter, screw engagement, and surrounding clearance before tightening the motor.

The motor body measures 36.5mm in diameter and 60mm in length, excluding the water-cooling jacket. The shaft measures 5mm in diameter with an 18mm specified length. Verify coupling compatibility and alignment before installation.

2. Connect the Motor to the ESC

Connect the motor's three phase wires to the corresponding brushless ESC outputs. The manufacturer does not require a specific phase-wire sequence.

If the motor rotates in the wrong direction, swap any two motor phase wires or use the ESC's supported motor rotation setting. Always disconnect the propulsion battery before changing the wiring.

3. Connect the Water-Cooling System

Attach the boat's cooling hoses to the motor jacket fittings. Follow the water-cooling circuit arrangement specified for your boat and secure the connections against loosening.

4. Inspect Before Operation

Before powering on the ESC, check the motor mounting, propeller shaft alignment, phase connections, battery wiring, and cooling hoses. Keep hands and loose objects away from the rotating drivetrain.

Maintenance & Operating Precautions

• Inspect the motor bearings regularly for unusual noise, resistance, or wear.
• Check cooling hoses and fittings for leaks, kinks, or loose connections.
• Remove dirt and contamination as recommended in the manufacturer manual.
• Verify that the propeller and shaft coupling run without excessive binding or vibration.
• Monitor operating temperature, especially after changing propeller size or battery voltage.
• Stop operation if motor temperature exceeds 100°C (212°F), as specified by Hobbywing.

The modular motor construction supports periodic inspection and maintenance. For disassembly, bearing inspection, and reassembly, follow the SEAKING V2 user manual.

Hobbywing SEAKING 3660SL V2 User Manual (PDF)

For complete installation instructions, motor dimensional drawings, water-cooling connections, wiring guidance, and service information, download the official Hobbywing SEAKING V2 manual.

Download Official SEAKING V2 Motor Manual (PDF)

The official document covers the SEAKING 2040SL, 2850SL, 3660SL, 3674SL, 4082SL, 4685SL, and 54113SL V2 motor families. Use the specifications and dimensional drawing for the 3660SL V2 when installing this product.

Frequently Asked Questions

Is the Hobbywing SEAKING 3660SL V2 2600KV motor brushless?

Yes. It is a 4-pole, sensorless brushless inrunner motor designed for electric RC boat propulsion. It requires a compatible brushless ESC.

Can the SEAKING 3660SL 2600KV V2 run on 4S LiPo?

Yes. Hobbywing specifies a 2S–4S LiPo operating range for the 2600KV version. A 4S LiPo battery has a nominal voltage of 14.8V. Use a compatible ESC and choose the propeller load carefully to avoid overloading the motor.

Which ESC is recommended for the 3660SL V2 2600KV?

The officially recommended controller is the Hobbywing SEAKING 90A V4 ESC. Verify the complete electrical setup, including battery voltage, connectors, and cooling requirements.

Does the motor need water cooling?

Yes. The motor uses a water-cooling jacket and is intended for installation in a properly functioning marine water-cooling system. Secure the tubing and confirm water circulation before running the boat.

What size shaft does the 3660SL V2 use?

The output shaft is 5mm in diameter with an 18mm specified length. Match the motor coupling to the shaft dimensions and verify drivetrain alignment.

What is the difference between the 2600KV and 3400KV models?

The 2600KV motor supports 2S–4S LiPo batteries, while the 3400KV version supports 2S–3S. Both belong to the 3660SL V2 family but have different KV ratings and no-load current specifications.

Can I reverse the motor rotation?

Yes. You can reverse the rotation direction by swapping any two motor phase wires. Alternatively, use the motor rotation setting if supported by your ESC. Disconnect the battery before changing connections.

What size RC boat can use this motor?

Hobbywing recommends this motor for boats up to 80cm (approximately 31.5 inches). Actual compatibility depends on hull weight, motor mounting, propeller selection, drivetrain configuration, and cooling capacity.

Complete Your RC Boat Power Setup

A well-matched RC boat power system brings together the motor, ESC, battery, propeller, and cooling circuit. Explore related components for your next marine brushless build:

• Hobbywing SEAKING ESCs – Marine speed controllers for Hobbywing brushless power systems.
• RC Boat ESCs – Compare electronic speed controllers for electric boats.
• RC Boat LiPo Batteries – Find battery options for your boat's electrical and physical requirements.