The tunnel thruster system includes a thruster propulsion mechanism including {HEAD ~ a drive unit} driving {TAIL ~ a transmission and propeller assembly} located within a thruster tunnel 
driving
The tunnel thruster system includes a thruster propulsion mechanism including { HEAD ~ a drive unit } driving { TAIL ~ a transmission and propeller assembly } located within a thruster tunnel
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH