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Rim-driven thruster
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<p>The rim-driven thruster, also known as rim-driven propulsor/propeller (or RDP) is a novel type of electric <a href="/facts/Propulsor/E9T8KwWq">propulsion unit</a> for ships. The concept was proposed by Kort around 1940, but only became commercially practical in the early 21st century due to advances in DC motor controller technology. As of 2017, commercial models of between 500 kW and 3 MW are available from manufacturers such as Rolls-Royce, Schottel, Brunvoll, Baliño, Voith, Van der Velden, etc. </p>