Vetus Bow Thruster Propeller, 6 blade, 5.9" Diameter, This is the 6-bladed propeller for the BOW35 and BOW55 bow thruster profile, which creates little or no cavitation. As cavitation produces unwanted noise, this new blade design offers a major reduction in the operating sound levels for VETUS bow thrusters. Moreover, the application of this new propeller has reduced the current consumption by up to 10%. An ideal upgrade for older 3-bladed VETUS propellers!