Design

Marine design

Transverse Stability, Part 2: Stability Curve and Knock-Down Energy

Transverse Stability, Part 2: Stability Curve and Knock-Down Energy

This article follows Transverse Stability Part 1: Fundamentals The most relevant way of expressing the relation between heel and stability for a given vessel is plotting the GZ-curve or the righting moment curve. Ships and load-carrying vessels start from KN-curves, because they allow taking into account large variations in trim and loading, but at the […]

Propulsion & Steering

Propulsion & Steering

The keel and rudder arrangement was also constrained by the intended use for the boat. In the Foveaux Strait and Stewart Island area, dealing with floats and lines on the surface is not uncommon, especially when picking up cod or crayfish pots. This prompted for extending the keel underneath the propeller and bridging the gap […]

Layout & Practical Considerations

Layout & Practical Considerations

Habitability Visitors on board are always surprised to find all the main conveniences of a home readily available: good size cooking range, oven, refrigerator, freezer, warm shower, heating, an owner’s cabin with double bed, three single bunks… It is a small home on the water with fabulous sea views. The elevation retained for the windows makes […]

Transverse Stability, Part 1: Fundamentals

Transverse Stability, Part 1: Fundamentals

Transverse stability is the ability of a vessel to resist and recover from heeling over. It important in the sense that this is what prevents a vessel rolling over and capsizing. For sailing vessels, stability is also needed to develop power under sail other than downwind. Stability is a force moment, i.e. forces separated by […]

Wild South: Where From Here?

Wild South: Where From Here?

Wild South 37 The Wild South 37 was designed and built as a concept boat for something that is quite radically different and superior to what the market has to offer. Over the years, a lot of considerations were discussed: larger and smaller vessels, same hull with a different look and appearance, different layouts… One […]

Hull Design & Seaworthiness

Hull Design & Seaworthiness

Seaworthiness Considerations The key design objectives for the project were seaworthiness, comfort and efficiency, i.e. low fuel consumption Seaworthiness encompasses good stability and flawless seakeeping. On a motor yacht, this relates to hull shape and – to a lesser extent – propulsion and steering arrangements. There are two primary contributors to vessel stability: hull shape […]

Nordkyn Project

Nordkyn Project

The 13-metre alloy sloop Nordkyn is the outcome a personal design and build project. In short, I wanted a new ocean cruising and voyaging yacht suitable for the type of sailing illustrated by the voyage of the sloop Yarra. The project had a long gestation period and involved development far beyond what would have been […]

Wild South Project

Wild South Project

The Wild South project started from discussions around creating a modern and practical displacement cruising launch: fast, safe, very comfortable, extremely economical and offering a long range without refuelling Experience shows that the main obstacles to cruising under power are typically comfort on board, especially under way, and fuel costs. We wanted to create a package that […]