multichine

Multichine is a term used in naval architecture to describe a hull form that features multiple chines. A chine is a sharp angle or break in the hull, typically formed where the bottom of the hull meets the sides. In a multichine design, instead of a single chine, there are two or more distinct chines running along the length of the vessel. This creates a more complex and faceted hull shape compared to a simple V-hull or a round-bilge hull.

The primary advantage of a multichine hull is its ability to combine the desirable characteristics of different hull types. It can offer better stability at rest and a smoother ride in choppy seas, similar to a displacement hull, while also providing improved speed and planing performance, akin to a planing hull. The multiple chines can help to lift the hull onto the water at higher speeds, reducing wetted surface area and thus drag. They can also provide chines that break water more efficiently, leading to a drier ride by deflecting spray outwards.

Multichine designs are often found in vessels where a balance of performance and seakeeping is required, such as workboats, patrol vessels, and some types of recreational craft. The construction of multichine hulls can be more complex than simpler hull forms, often involving more framing and plating or requiring more intricate mold shapes in composite construction. Despite this, the performance benefits often make it a worthwhile design choice.