Yacht Concepts

Below are a few concepts for sailing yachts that I have developed. As they are only concepts they can be easily modified for different requirements and tastes. 

One feature they all have in common is that they have high length to beam ratios, low displacement and are optimised for a small crew. 

Long and narrow hulls with low displacement have low drag. This in turn allows the use of a small sail area while still achieving high performance. I believe that this is the best concept for sailing yachts for small crews. The loads on the rig are comparable to a much smaller yacht and therefore can be handled by a small crew while having the speed advantage of a much longer waterline.

Additional advantages are that the yacht will be more comfortable at sea due to less abrupt motions and easier to helm. Wide boats have to be kept upright to stay under control which is difficult on the helmsman in gusty conditions or big waves. 

One disadvantage is that long and narrow hulls do not offer the same interior volume compared to wider boats. For example the Bondi 52 has the same width as a boat 10 feet shorter and therefore interior volume is more comparable to a boat of that size.

Bondi 33

The Bondi 33 has been designed for hassle free fun on the water. It can be raced with three people. The low drag hull and low weight make it possible to use a relatively small sail area while still achieving outstanding performance. A small sail area requires less crew and sails can be handled without winches. 

Due to the narrow hull she is still fast heeled over and therefore the keel produces the majority of the righting moment and not the weight of the crew. The keel and rudder can be lifted to enable launching from a ramp. The dimensions of the boat and the weight make transport via road trailer or inside a 40’ standard shipping container possible. 

Under the fordeck there is storage room for sails when the boat is at the dock. Since the forestay is far aft a bowsprit is not required for the asymmetrical spinnaker. 

Mechanical propulsion could be provided by a small outboard motor at the transom or by an electric motor.



Length: 10.0 m
Beam: 2.2 m
Draft: 2.0 m
Sail Area (100%): 40 m2
Displacement: 850 kg
Ballast: 500 kg


Bondi 40 concept

The Bondi 12m is a concept for a fast yacht that is easy to sail shorthanded. The hull is relatively slender (12m length, 3m beam) with a displacement of only 5t. Hull resistance is therefore very low which results in low loads on the rig and sail. Additionally performance is not much affected by larger heel angles. The righting moment is mainly produced by the keel and not by the weight of the crew. 

The main and self-tacking jib sheets are led to captive winches under deck enabling push button sailing. The grinder won’t get tired and sails can be adjusted more often to achieve optimum sail trim at all times.

All these design choices ensure that performance with a small crew is outstanding.

The compromise is that the hull volume is relatively small. Nevertheless the accommodations are comfortable enough for a weekend away. There is a large V- berth forward followed by a saloon with seating for 6. A small galley and head are located near the companionway. Access to an aft bunk is via the galley.

Bondi 52 Cruising Yacht Concept

Concept for a fast and comfortable long distance cruising yacht. The yacht is designed with safety, comfort and speed in mind. The hull is relatively long and slender to minimise drag and weight. A narrow hull also moves much more comfortably in the waves and requires smaller sails which reduces loads and improves handling by a small crew. The cockpit is relatively small and well protected by a fixed sprayhood. The mainsheet runs on top of the sprayhood to reduce the risk of injury.

The rig has an inner and outer forestay, each with a furler. Therefore the crew does not have to access the foredeck to change sails eliminating another safety risk. Sail changes are also much quicker and therefore a risky job which is often avoided is turned into a quick and safe maneuver. 

Downstairs there are three cabins. One in the bow, one midships and one aft cabin. The midships cabin is ideal for sleeping at sea because it is close to the centre of the boat and away from noisy areas such as the cockpit and the engine. 

The engine and generator are located in a spacious walk in engine room which can also function as a small work shop. 

The transom has a large garage for the tender with a fold down swim platform.

The boat can be customised to the owner's requirements. This includes the interior lay-out and hull dimensions. The current design parameters are:

Hull Length 16 m
Width 4 m
Displacement 10.5 t
Mainsail Area 70 m2
Foresail Area 60 m2

KJ Engineering Consulting - 16m Concept Interior Configuration