Marine Technical Training Academy

  Classification The marine transmission is classified according to their location in the boat as In-board transmissions and Out-board transmissions or lower units. Additionally, the inboard transmissions possess different gear ratios and output torques depending on whether they are designed for diesel or gasoline engines. In-Board Transmissions The inboard transmissions are classified according to the configuration between the motor and the propeller shaft into a)  In-line shaft, and b) V-drive shaft.     Gear Box or Transmission? In technical terms, the gearbox is part of the transmission. A gearbox is basically a synchronized group of toothed wheels that are used to transfer motion from one shaft to another. And a Transmission is a gear box controlled, manually, hydraulically, or servo-assisted. The marine transmission is a perfect combination of the three systems with a constant gear ratio on forward and reverse.   In-line Transmission (Parallel Axis) In this configuration, the i