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Motor yacht OHTA

Project  ST10W

Conceptual & detailed design

 

Vessel Type

A service and utility planing craft equipped with single or twin waterjets. It features an aft-mounted engine room with an open cockpit located directly above, providing easy access for engine installation and maintenance. The main salon is situated in the midship section, enclosed by a superstructure mounted on the main deck. The wheelhouse is positioned on deck at midships, aft of the salon superstructure.

Construction

Hull: Planing hull with hard-chine V-bottom contours and a raked stem.

Deadrise: 12.5° at midships and 5° at the transom.

Design: A shallower stem profile at the bow combined with sharper waterlines provides a modern silhouette and enhances seakeeping performance. The hull plating features simple linear curvature (developable surfaces), allowing sheets to be unfolded onto a plane. A longitudinal spray rail (35–50 mm wide) is fitted along the chine.

Material: The hull is constructed of steel. Bottom plating thickness is 3 mm; side plating is 2 mm. This is sufficient for structural integrity, while any minor oil canning (surface waviness) is considered acceptable for the aesthetic of this vessel type.

Superstructure: To reduce weight, the superstructure is made of 1 mm aluminum alloy (AlMg6). Alternatively, it can be designed as a steel frame with a canvas canopy or as a fiberglass (GRP) structure.

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