Firduo 6374 Brushless Motor 140KV 3600W | Waterproof for eFoil & Underwater Thruster

🌊 Compact Power. Full Waterproof. Ready to Ride.

The Firduo 6374 140KV is a high-efficiency waterproof brushless motor purpose-built for eFoil, underwater thrusters, electric surfboards, and ROV/AUV applications. Delivering 3600W peak power in a compact 63×74mm form factor, with IP58 waterproof rating and ceramic bearings for continuous submersion, it's the ideal choice for builders who need reliable propulsion without the bulk. The long-thread Φ10mm shaft and 1300mm pre-wired leads make installation straightforward in most DIY mast and thruster tube configurations.

⚡ Key Features

• ✅ 3600W Peak Power — 2400W rated, optimized for sustained eFoil and thruster loads
• ✅ IP58 Waterproof — ceramic bearings for continuous fresh and salt water submersion
• ✅ Wide Voltage Range: 6S–16S (25.2–67.2V) — compatible with most LiPo/Li-ion packs
• ✅ 12N/14P Construction — smooth, efficient torque across the full RPM range
• ✅ Long-Thread Shaft Φ10mm — direct propeller mount, no adapter required
• ✅ 1300mm 12AWG Phase Wires — long enough for mast and thruster tube routing
• ✅ 4mm gold connector (male) — direct fit to most VESC ESC phase outputs
• ✅ Compact 63×74mm form factor — fits tighter builds vs. the 6384
• ✅ Motor + Propeller bundle available — matched 140mm 3-blade prop in kit variant

📋 Full Specifications

📐 Motor Dimensions (Long-Thread Shaft)

📈 Performance Characteristic Curves

📦 What's in the Box

• Motor :

• 1× Firduo 6374 140KV Motor(Includes: 3*4mm gold female connector (male connector pre-installed on motor))
  

• Motor + Propeller :

• 1× Firduo 6374 140KV Motor(Includes: 3*4mm gold female connector (male connector pre-installed on motor))

• 1× Propeller (140mm, 3-blade)
  

📐 Propeller Drawing (Bundle Variant)

🔗 Compatible Builds & Recommended Pairings

• eFoil / Electric Hydrofoil — direct shaft mount to foil mast thruster tube
• Underwater Thruster / ROV / AUV / USV — IP58 rated for continuous submersion
• Electric Surfboard / Jetboard — compact 63×74mm body fits tight hull designs
• Recommended ESC: Firduo Manatee 100 Pro (75V 100A VESC) — FOC mode, 100A continuous, full 6S–16S support
• Recommended Remote: Firduo VX3 Waterproof Remote (IP67) — 1.6" display, cruise control, wireless charging
• Battery: 10S–14S LiPo or Li-ion recommended for optimal power band (not included)
• Propeller: 140mm 3-blade (available in Motor + Propeller bundle variant)

🛠️ Setup Guide (Quick Start)

1. Choose your variant — Select "Motor" if you have your own propeller, or "Motor + Propeller" for the matched 140mm 3-blade prop. Please confirm that the inner diameter of your thruster tube matches the outer diameter of the motor. 
2. Mount the motor — secure the 6384 into your motor mount, thruster housing, or mast pod. The long threaded shaft allows direct propeller attachment. Route the 3×12AWG phase leads away from the propeller arc and any moving
   
3. Route the phase wires — feed the 1300mm 12AWG wires through your mast or tube. The 4mm gold connector connect directly to most VESC ESC phase outputs. Ensure no sharp bends in the wire routing.
4. Connect to ESC — plug the 3 phase wires (A-B-C) into your ESC. Motor direction can be reversed by swapping any two phase wires, or via VESC Tool software if using a VESC-based ESC.
   
5. Run motor detection — in VESC Tool, run the FOC motor detection wizard. At the same time, check and confirm that the test parameters are valid and correct. This ensures optimal FOC performance.
6. Set current limits — configure motor max current to 88A and battery current to match your pack's continuous discharge rating. After actual testing, adjust the current limiting value as needed, while ensuring it does not exceed the motor's rated current of 59A.Set motor temperature protection if using a temp sensor.
7. Water test — submerge the motor and run at 10–20% throttle first. Check for unusual vibration (propeller balance) and verify the ceramic bearings run smoothly before full-power runs.
   

❓ FAQ

Q1: What is the difference between the 6374 and the 6384 motor?
The 6374 (this motor) has a 74mm length vs. 84mm on the 6384, making it slightly shorter and lighter (1.1kg vs. 1.3kg). Peak power is 3600W vs. 4400W. The 6374 is ideal for builds where space is tight or where 3600W is sufficient thrust. Both share the same Φ10mm shaft, 140KV rating, and IP58 waterproofing, so propellers and mounts are interchangeable.

Q2: Which ESC and remote are recommended?
The Firduo Manatee 100 Pro (75V 100A VESC) is the ideal ESC pairing — it supports FOC mode, covers the full 6S–16S voltage range, and handles the 6374's 75A max current with headroom. For the remote, the Firduo VX3 (IP67, 1.6" display, cruise control) is purpose-built for eFoil and water sports use. Both are available individually or as part of the Firduo 2KW Efoil Kit.

Q3: Is IP58 sufficient for eFoil and continuous underwater use?
Yes. IP58 certifies the motor for continuous submersion beyond 1 meter depth — suitable for eFoil, underwater thrusters, and ROV applications. The ceramic bearings are specifically selected for corrosion resistance in both fresh and salt water. Always rinse with fresh water after salt water use to maximize bearing and seal longevity.

Q4: What battery voltage gives the best performance?
For eFoil and thruster builds, 12S–14S (44–52V) is the optimal range, placing the motor in its peak efficiency band (refer to the characteristic curves at 36V and 48V above). At 16S (67.2V) you reach maximum power output but generate more heat under sustained load. For lighter builds or SUP thrusters, 10S–12S is a good balance of power and runtime.

Q5: Do I need the propeller bundle, or can I use my own?
The "Motor" variant ships without a propeller — you can mount any propeller with a compatible Φ10mm bore. The "Motor + Propeller" bundle includes a matched 140mm 3-blade propeller optimized for this motor's power and RPM range. If you're unsure which propeller to use, the bundle is the easiest starting point and eliminates the guesswork on pitch and diameter matching.

🏄 Application Scenarios