Towing & Ship-Assist · Ship-Assist — Indirect Mode
An escort tug working in the 'indirect' mode generates steering/braking force primarily from:
- AIts propeller thrust alone
- BHydrodynamic lift on its hull/skeg as water flows across it at an angle, with the towline taking the load✓ Correct
- CIts anchor
- DBow thrusters only
Explanation
In indirect mode the tug presents its hull at an angle to the water flow; hydrodynamic lift (not just propeller thrust) on the hull and skeg produces large steering and retarding forces on the escorted ship, transmitted through the towline.
Authority: Towing practice; escort tug operations
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