Harbour tugboat
A harbour tugboat is a powerful, manoeuvrable vessel designed to assist larger ships with docking and navigation in confined waters.
Also known as: harbour tug
How big is it?
30 m · defined representative length
Also 98.43 ft
Defined representative length · defined specimen
Typical recorded range: 20 m to 40 m.
A little perspective
Harbour tugboat vs Giant kelp plant: length comparison
The representative length of a harbour tugboat is approximately equal to the full thallus length of a giant kelp plant.
A harbour tugboat is a powerful, manoeuvrable vessel designed to assist larger ships with docking and navigation in confined waters.
Giant kelp is a large brown alga that grows from the seafloor and can form dense underwater forests.
Both rulers start at the same zero and share one linear scale. Artwork keeps its original proportions. Horizontal rulers compare the selected spans; vertical brackets also identify height on the artwork.
Measurements, assumptions & sources +
Harbour tugboat
Defined representative length: 30 m; defined specimen; range 20 m–40 m.
A defined 30 m harbour tug with 500 tonne displacement and 6 m/s operating speed. Tug designs vary greatly; bollard pull is a separate force measurement.
Defined examples — our methodology
The marked defined representative length is calibrated. Unmeasured illustration details are representative.
Giant kelp plant
Representative full thallus length: 30 m; representative; range 20 m–45 m.
A representative mature giant kelp (Macrocystis pyrifera) thallus 30 m from holdfast to longest blade tip. Flexible fronds change shape with current, and a real holdfast anchors to rock rather than forming roots.
NOAA Ocean Service — Kelp forests
The marked representative full thallus length is calibrated. Unmeasured illustration details are representative.
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Why this measurement?
Why we use 30 m
We compare the representative length of a harbour tugboat. This is an illustrative comparison value, not a claim that every example is the same. The recorded range is 20 m to 40 m.
A defined 30 m harbour tug with 500 tonne displacement and 6 m/s operating speed. Tug designs vary greatly; bollard pull is a separate force measurement.
The marked horizontal span follows the measured feature, not the edges of the image. How calibrated comparisons work →
Recorded properties
Dimensions and measurements
| Property | Selected value | Recorded range | Basis |
|---|---|---|---|
| 30 m | 20 m to 40 m | defined specimen | |
| 500 t | 200 t to 1,000 t | defined specimen | |
| 6 m/s | 4.2 m/s to 8.4 m/s | defined specimen |
Around this scale
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