Voith Turbo has designed a new industrial retarder (hydrodynamic brake) for simulating various load conditions of diesel engines. Four units have been delivered for use on the training stand at the German Navy’s Parow Marine School where they are operated under quasi-realistic conditions in order to teach the cadets how the engines function. The VIR 133-2-S retarder simulates a load that closely resembles that of a marine drive with propeller. For this application, three hydrodynamic brakes are activated and connected to the diesel engine. This is the only way of braking the maximum output of over 1200kW. After only minor modification, the industrial retarder can be turned into a tailor-made solution for a wide range of applications such as diesel engine test stands.