Due to the tugboat's specialized hull shape and propulsion system, vessel behavior differs greatly from conventional ships. This guide covers techniques for utilizing inertia and momentum — from deceleration to course changes and berthing.
Full Ahead → Half Ahead → Neutral with RPM increase for braking. Kort Nozzle + Z-Peller braking effect.
At 3+ Knots forward/astern, raising both RPMs at NEUTRAL lever → propeller thrust creates BRAKING effect → vessel stops rapidly.
Differential RPM: Higher port RPM → port turn; higher stbd RPM → stbd turn. Steering at neutral.
Above 5 Knots: Reduce both RPMs FIRST, then steering to neutral. Sudden NEUTRAL → severe vibration → SYSTEM FAILURE.
Gradual port turn by slightly increasing port engine RPM while coasting on momentum.
Above 5 Knots: Reduce RPMs FIRST, then steering neutral.
Forward momentum drives a wide port turn arc ~180°. Vessel berths stbd-side-to with astern braking.
Forward momentum drives a wide stbd turn arc ~180°. Vessel berths port-side-to with astern braking.