
HS49125 E-surfboard and outboard propulsion bldc motor
Brushless DC motor · Ø49×125 · 8-pole · no Hall sensors
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Brushless DC motor · Ø49×125 · 8-pole · no Hall sensors

200m Depth Rating · 2.7N·m Peak Torque · 590g Lightweight

A high-efficiency, energy-saving brushless dc motor designed for survey vessels and unmanned vessels.

Engineered specifically for harsh underwater environments, this underwater brushless motor utilizes a high-strength sealed structure and corrosion-resistant materials to ensure stable operation even under deep-water high pressure.

200m Depth Rating · 2.5N·m Peak Torque · 430g Lightweight
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Buying guides, material notes, and stories for choosing with more confidence.

Long submersions, continuous duty, a simple drive — take the inrunner and accept 1.22 W/g.
Three noise sources only: electromagnetic, bearing, aerodynamic. A coast-down test rules out two of them.

The part is HS-FS41105 — Φ41 × 105 mm, 900 W continuous, 1600 W peak, IP68, 6-pole, Class F insulation, 650 g. For that envelope, a 900 W rating is not a conservative claim. Every figure below either