Ultimate Guide to Underwater Thrusters

Welcome to HobbyWater—your go-to platform for high-performance underwater thrusters designed for boats, paddleboards, electric surfboards, and more! Whether you're into marine exploration or water sports, our advanced propulsion systems deliver power, efficiency, and reliability.

What is an Underwater Thruster?

(e.g  TD30E 2 propeller verson)

An underwater thruster is an electric propulsion system that replaces traditional fuel-based outboard motors. Composed of a brushless motor, propeller, nozzle (duct), mounting base, and wiring, it provides silent, eco-friendly, and high-thrust movement through water.

Key Components

1.Motor (Brushless DC - BLDC)(e.g 66168 motor)

KV Rating: Determines RPM per volt (RPM = KV × Voltage).

Power & Torque: Higher KV = faster spin, lower torque; Lower KV = higher torque, better for heavy loads.

Inner vs. Outer Rotor:

Inner Rotor: Compact, better waterproofing (ideal for harsh conditions).

Outer Rotor: Higher pole count, stronger magnetic field, better cooling.

2.Propeller (e.g td46 propeller)

Diameter & Pitch: Larger diameter = more thrust; higher pitch = faster speed.

Blade Count: 2-5 blades (more blades = smoother, less cavitation).

Rotation: CW (Clockwise) or CCW (Counterclockwise) for balanced thrust.

3.Nozzle (Duct) (e.g TD40E)

The nozzle is a specially designed housing that surrounds the propeller, serving two main purposes:

Propeller Protection – Shields blades from debris, rocks, and marine growth.

Thrust Optimization – Channels water flow for higher pressure & efficiency.

Key Benefits of Using a Nozzle
✔ Increased Thrust – Directs water flow more effectively than open propellers.
✔ Enhanced Safety – Prevents accidental contact with spinning blades.
✔ Reduced Cavitation – Minimizes air bubbles & turbulence for smoother operation.
✔ Better Efficiency – Higher thrust-to-power ratio, meaning more speed with less battery drain.

4. Mounting Base (e.g TD30E standard)

We offer multiple base types to fit various watercraft:

Standard Small Base – For lightweight applications.

Medium Base – Ideal for SUPs (Stand-Up Paddleboards).

Heavy-Duty Base – For boats and high-speed electric surfboards.

Custom Bases – Need a special fit? Contact us for tailored solutions!

5. Wiring & Control (e.g TD40E cable)

Standard Connection:

Positive & Negative Wires (Power supply).

PWM Signal Wire (Speed control).

Optional:

5V PWM Power (BEC) – Some models include built-in 5V supply; if not, an external BEC (Battery Eliminator Circuit) is required.

ESC (Electronic Speed Controller) Options:

• Built-in ESC – No extra controller needed (plug-and-play).
• External ESC Required – For thruster models without an integrated ESC.

How Does an Underwater Thruster Work?

The ESC (Electronic Speed Controller) regulates power from the battery to the motor using PWM signals (1ms-2ms pulse width):

• 1ms = Full reverse
• 1.5ms = Neutral (stop)
• 2ms = Full forward

Differential Thrust Steering: Using two thrusters, varying speeds enable sharp turns without a rudder.

Power & Battery Requirements

Voltage (V): Higher voltage = higher RPM (e.g., 24V, 48V).

Capacity (mAh/Ah/Wh): Determines runtime.

• Formula: Runtime (h) = Battery Capacity (Ah) / Current Draw (A)

Discharge Rate (C-Rating): Critical for high-power applications (e.g., 50C = 50 × capacity in amps).

Why Choose HobbyWater Thrusters?

✅ Eco-Friendly – Zero emissions, electric-powered.
✅ High Efficiency – Optimized propeller & motor designs.
✅ Durable & Waterproof – IP68-rated for saltwater & debris resistance.
✅ Customizable – Adjustable PWM, ESC programming, and thruster configurations.

Perfect For:

• Electric Surfboards & Kayaks&Inflatable Boat
• SUP &Canoe&Fishing Boat
• Underwater Drones (ROVs)
• USV - Unmanned Surface Vehicle
• Floating Dock/Platform
• Boating & Marine Exploration

Upgrade your watercraft with HobbyWater’s cutting-edge thrusters—engineered for speed, control, and adventure!