The ___ davit is cranked outboard by a large vertical screw with a metal sheath enclosing the screw.

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Multiple Choice

The ___ davit is cranked outboard by a large vertical screw with a metal sheath enclosing the screw.

This item tests understanding of a screw-operated davit design. A sheath-screw davit uses a large vertical jack screw that is enclosed by a metal sheath. When the crank is turned, the screw rotates and, through a nut or carriage, pushes the davit arm outward, extending the lifeboat cradle. The sheath around the screw protects the threads from water and debris and keeps the motion aligned for smooth, controlled operation. This mechanism is distinct from other davit types that rely on quadrants, radial arms, or a single pivot rather than a vertical screw jack.

This item tests understanding of a screw-operated davit design. A sheath-screw davit uses a large vertical jack screw that is enclosed by a metal sheath. When the crank is turned, the screw rotates and, through a nut or carriage, pushes the davit arm outward, extending the lifeboat cradle. The sheath around the screw protects the threads from water and debris and keeps the motion aligned for smooth, controlled operation. This mechanism is distinct from other davit types that rely on quadrants, radial arms, or a single pivot rather than a vertical screw jack.

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