Early models used the VIIB configuration of two AEG GU 460/8-276 electric motors, totaling 750 horsepower with a max rpm of 296, while newer boats used two BBC GG UB 720/8, Garbe, Lahmeyer & Co. RP 137/c or Siemens-Schuckert-Werke (SSW) GU 343/38-8 electric motors with the same power output as the AEG motors.