Which type of davit is cranked outboard by a large vertical screw with a metal sheath enclosing the screw?

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Multiple Choice

Which type of davit is cranked outboard by a large vertical screw with a metal sheath enclosing the screw?

The feature described—cranking outboard with a large vertical screw enclosed in a metal sheath—points to a screw-driven mechanism built into the davit. In a sheath screw davit, a vertical screw jack is used to extend the arm and swing the cradle outward over the rail, so the lifeboat can be lowered into the water. The metal sheath around the screw serves to guide and protect the threads, keep everything aligned, and resist debris and corrosion, which helps maintain smooth operation in challenging conditions. Other davit types use different mechanisms for moving the boat: a quadrantal davit relies on a curved track to swing the arm, a radial davit uses a straight arm rotating about a base, and a single-point davit uses a simpler winch and pivot system without a vertical screw and protective sheath. Therefore, the description fits the sheath screw davit best.

The feature described—cranking outboard with a large vertical screw enclosed in a metal sheath—points to a screw-driven mechanism built into the davit. In a sheath screw davit, a vertical screw jack is used to extend the arm and swing the cradle outward over the rail, so the lifeboat can be lowered into the water. The metal sheath around the screw serves to guide and protect the threads, keep everything aligned, and resist debris and corrosion, which helps maintain smooth operation in challenging conditions.

Other davit types use different mechanisms for moving the boat: a quadrantal davit relies on a curved track to swing the arm, a radial davit uses a straight arm rotating about a base, and a single-point davit uses a simpler winch and pivot system without a vertical screw and protective sheath. Therefore, the description fits the sheath screw davit best.

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