Escort Tug - Operating Speed Window

Operating-speed window of an escort tug based on rudder-direct / indirect assist mode - the governance of escort missions for laden tankers.

TugEscortOSV

Tug type

Direct-mode range: 0–8 kn (direct mode)

Indirect-mode range: 6–12 kn (indirect mode)

Changing the inputs requires JavaScript. The calculator above shows its default inputs and result. The formula, symbols, and regulatory sources are shown in the Formula section below.

Formula, assumptions, and limits

v = f(\text{tug type}, \text{assist mode})

Symbol	Meaning	Unit
$ASD$	Azimuth Stern Drive
$Indirect$	Tug hull used as rudder at speed

Source: ISPO Escort Tug Guidelines

In short

Operating-speed window of an escort tug based on rudder-direct / indirect assist mode - the governance of escort missions for laden tankers.

Learn the theory Offshore Support Vessels and Marine Operations