Towing & Ship-Assist · Ship-Assist & Escort
In 'indirect' mode during a high-speed escort, an escort tug develops most of its steering and braking force from:
- AIts engines alone, at full power astern
- BThrowing out an anchor
- CSignaling the ship to slow down
- DHydrodynamic (lift and drag) forces on its hull and skeg as water flows past at an angle✓ Correct
Explanation
In indirect mode the tug presents its hull at an angle to the flow created by the escorted ship's speed; the resulting hydrodynamic forces on the hull/skeg can far exceed the tug's bollard pull, providing powerful steering and braking on a moving ship.
Authority: Bowditch (Pub. No. 9)
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