Schottel launches retractable version of its rim thruster

Written by Nick Blenkey
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Covering the power range up to 500 kW, the SRT-R offers many advantages, such as low noise emissions and tailor-made solutions for a wide range of applications

The newly developed Schottel Retractable Rim Thruster (SRT-R) covers the power range up to 500 kW, offering many advantages, such as low noise emissions and tailor-made solutions for a wide range of applications. Optimized by CFD (computational fluid dynamics), the internal propeller blades are hydrodynamically designed to be highly resistant to cavitation.

The SRT, one of Spay, Germany-based Schottel’s latest developments, is an electric propulsion system. The electric motor stator is installed in the outer part of the tunnel, while the propeller blades are attached to the inside of the rotor. This results in a space-saving and low-weight thruster. It converts electric power directly into propulsion power. Surrounding water permanently cools the electric motor, preventing it from overheating.

The newly launched retractable variant, the SRT-R is able to cover a thrust radius of 360 degrees. This not only makes it more versatile, but also allows it to be optimally adapted to any requirement and operation profile, including DP operation or as a take-you-home device. In retracted position, no additional flow resistance is generated.

Like the SRT, the SRT-R also features low-level noise and vibration. This makes the thruster particularly suitable for all vessels regularly carrying passengers, such as yachts or cruise vessels with high demands on comfort.


The retractable rim thruster is also available as an RT variant. This means that in retracted position it also functions as a transverse thruster, making it highly effective in shallow water. Characterized by improved maneuverability, its range of application extends from brief docking and casting-off in ports to continuous operation with dynamic positioning; for example, for following the sun in DP mode for yacht applications. It also stands out due to its short response time to steering commands that make precise dynamic positioning easier at all times.

Offering the option of using biodegradable oils, vessels with the SRT-R are compliant with the current VGP regulations of the U.S. Environmental Protection Agency.

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