What are the two most common types of mechanical davits?

Prepare for the Water Survival 929 Test. Use flashcards, multiple choice questions, hints, and explanations. Get water safe!

Multiple Choice

What are the two most common types of mechanical davits?

Mechanical davits lower lifeboats by turning a drive input into a controlled motion of the cradle. The two most common designs you’ll encounter are quadrantal and sheath screw. A quadrantal davit uses a curved, quarter-circle (quadrant) arc for the beam, giving a stable, predictable lowering path as the boat is lowered along the ship’s side. A sheath screw davit uses a screw-drive mechanism enclosed in a protective sheath to move the cradle up and down with positive control and braking, which is especially reliable in rough seas. These designs are widely taught and used because they offer reliable, straightforward operation and maintenance on a broad range of vessels. Other terms describe different mechanisms or configurations, but they aren’t as commonly implemented as the standard mechanical quadrantal and sheath screw types.

Mechanical davits lower lifeboats by turning a drive input into a controlled motion of the cradle. The two most common designs you’ll encounter are quadrantal and sheath screw. A quadrantal davit uses a curved, quarter-circle (quadrant) arc for the beam, giving a stable, predictable lowering path as the boat is lowered along the ship’s side. A sheath screw davit uses a screw-drive mechanism enclosed in a protective sheath to move the cradle up and down with positive control and braking, which is especially reliable in rough seas. These designs are widely taught and used because they offer reliable, straightforward operation and maintenance on a broad range of vessels. Other terms describe different mechanisms or configurations, but they aren’t as commonly implemented as the standard mechanical quadrantal and sheath screw types.

More practice questions