Firduo Brushless Inrunner Motor 75141 100KV 9KW for Efoil & Jetboard

🌊 Firduo 75141 Brushless Inrunner Motor — 100KV / 9KW for Efoil & Jetboard

The Firduo 75141 is a high-torque, fully waterproof brushless inrunner motor engineered for demanding efoil, electric hydrofoil, and jetboard applications. With 50KGF maximum thrust and a robust 18N/20P construction, it delivers the power and reliability needed for serious water sports builds.

⚡ Key Features

• ✅ Fully waterproof — rated for full submersion in marine environments
• ✅ High-torque 18N/20P construction for smooth, efficient power delivery
• ✅ 50KGF maximum thrust — ideal for efoil and jetboard propulsion
• ✅ Wide voltage range: 5S–18S (21–75V) for flexible battery compatibility
• ✅ 120℃ working temperature limit for sustained high-power operation
• ✅ 8mm gold bullet plug connectors for secure, low-resistance connections
• ✅ 1300mm extension wire — long enough for most efoil mast configurations
• ✅ Compatible with Firduo FD75200 75V 200A VESC

📋 Specifications

📦 What's in the Box

• 75141-100KV Motor × 1
• 8.0mm bullet connectors × 3
• Firduo 120A Connector × 3 (optional kit only)

🔗 Compatible Builds & Recommended Pairings

• Recommended ESC: Firduo FD75200 75V 200A Water-Cooled VESC — FOC mode, 200A continuous, full 5S–18S support, water-cooled for sustained high-power eFoil sessions
• Phase Connectors: Firduo 120A IP68 Waterproof Connector — rated for 120A continuous, IP68 sealed; included in the Motor + Connector kit variant
• Signal Connectors: Firduo 3-Core / 4-Core IP68 Waterproof Connector — for Remote receiver, sensor, temperature, and hall signal wiring through waterproof enclosures
• Remote: Firduo VX5 IP68 Waterproof Remote — Battery capacity 5,000mAh,Up to 20 hours continuous use, cruise control, PPM/UART
• Recommended kit: Firduo eFoil Kit – 75141 Motor + 200A VESC + VX5 Remote, complete electronic system included.
• Anti-Spark Switch: Firduo 200A Anti-Spark Switch — eliminates connector spark on battery connection, 12V–60V
• Applications: eFoil / electric hydrofoil, jetboard, electric surfboard, underwater thruster, ROV/AUV
• Battery: 12S–16S LiPo or Li-ion recommended for optimal power band (not included)
• Propeller: Φ12mm shaft — compatible with standard eFoil propellers; verify foil mast specifications for pitch and diameter match

🛠️ Setup Guide (Quick Start)

1. Choose your variant — Select Motor only if you have your own phase connectors, or Motor + Connector ×3 for the kit that includes 3× Firduo 120A IP68 waterproof connectors pre-matched to the motor's 8mm bullet plugs.
2. Mount the motor — The 75141 inrunner mounts inside your thruster tube or mast pod. Align the Φ12mm shaft with your propeller hub. Apply marine-grade thread locke to the prop nut to prevent loosening under vibration and water pressure.
3. Connect phase wires — Route the 1300mm extension wires through your mast channel. Connect the 8mm bullet plugs to the ESC phase outputs (A-B-C). If using the 120A waterproof connectors (kit variant), crimp or solder the connector terminals to the wire ends before mating — refer to the connector wiring diagram for terminal assembly.
4. Connect ESC and battery — Wire the FD75200 ESC to your 12S–16S battery using a high-current connector (120A–250A Connector). Install the 200A Anti-Spark Switch between battery and ESC to eliminate connection sparks.
5. Configure ESC via VESC Tool — Connect the FD75200 via USB-C and run the FOC motor detection wizard. Set the motor's current limit according to your needs, and set battery current limit to match your battery's continuous discharge rating. Configure throttle curve and protection thresholds before first water test.
6. Pair VX5 remote — Power on the ESC first, then the VX5 remote. Switch to eSurf mode on the VX5 for water use (enables cruise control and optimized throttle response).
7. Water test — Start at 20–30% throttle in calm water. Verify thrust direction and check for unusual vibration (propeller balance). Confirm all cable penetrations are dry after the first run. Rinse with fresh water after each salt water session.

❓ FAQ

Q1: What ESC is recommended for this motor?
A: The Firduo FD75200 75V 200A VESC-compatible ESC is the ideal pairing for this motor in efoil applications.

Q2: What battery configuration works best?
A: The motor supports 5S–18S (21–75V). For efoil use, 12S–16S LiPo or Li-ion packs are most common.

Q3: Is this motor truly waterproof?
A: Yes — the 75141 is fully waterproof and rated for continuous submersion in fresh and salt water.

Q4: What propeller size is compatible?
A: The 12mm shaft is compatible with standard efoil propellers. Check your foil mast specifications for the best match.

Q5: Can this motor be used for applications other than efoil?
A: Yes — the 75141 is suitable for jetboards, underwater thrusters, and other high-power watercraft DIY builds.