Bourno-class Yacht

The **Bourno-class Yacht** is the result of a request for a yacht by Miss Leia Leour of Willitya. For SDY, it is a bit of an experimental design as well, mainly due to using a tumblehome-style hull design for the first time in such a large vessel.

## Design

The Bourno-class Yacht is a 12,500 tons heavy, 220 metres long monohull yacht with a draft of 9.6 meters and a beam of 50.3 meters. While this last figure sounds massive, this arrangement is mostly due to the tumblehome construction of the vessel.

This construction method, originally from the age, when sails and oars were the engines of ships, means, that the hull of the vessel narrows the higher up from the waterline you get. It was in fashion for a while in warship construction and appears to make a comeback with some navies, but in general, warship design moved on from that practice (although some argue, that a 'small amount of tumblehome' is still usual in ship design). This construction method allows for a higher freeboard, meaning more distance between the upper deck the waterline, as well as greater characteristics at long-distance journeys by increasing the stability. It also allows for better passages through canals and other waterways.

The vessel is powered by four diesel generators in a scheme known as Integrated Electric Propulsion, IEP for short. This allows for these generators to provide all the power needed aboard, saving space and maintenance costs and allowing for some neat tricks in the construction. Two exhaust pipes funnel the diesel fumes out after filtering out the majority of the pollutants. We recommend swapping the filters once every two years.

One of the neat tricks mentioned is the actual propulsion, arranged by two azimuth thruster pods beneath the stern, which, due to being trainable, eliminate the need for a rudder and allow for easier docking of the vessel, together with a bow thruster. The electrical engines in the pods are easily removed and replaced in case of damages.

With this, the Bourno-class Yacht can attain a maximum speed of 34 knots (or 62.9 kilometers per hour) and is rated for a cruise speed of 16 knots (or 29.6 knots). The vessel, when cruising at this speed, has a range of 8,000 nautical miles or 14,816 kilometers.

Aftwards, the Bourno-class Yacht is equipped with a well deck, which allows the easy and speedy deployment and recovery of smaller boats, in this case with space for up to ten small boats, around the size of the Majestic-class Boat, and one Mini-Submersible. In total, the well deck measures 90 metres in length and 25 metres in width and can be flooded to a depth of 2.9 metres.

In order to defend itself and VIP-Passengers aboard, the Bourno-class Yacht is equipped with an advanced missile defense system, namely a series of Radar Warning Receivers and a Multi-Ammunition Softkill System, which analyzes the data received by the RWRs and calibrates decoys to the right frequencies on the electromagnetic spectrum to confuse the incoming missiles into missing the vessel. For a more hands-on approach to defending the vessel, the Bourno-class Yacht has three armouries scattered over the vessel, accessible via fingerprint or retina scanners or both, depending on the customer's wishes. While SDY provides the shelves and lockers, the weaponry itself must be acquired by the customer.

Should it still be necessary, the Bourno-class Yacht has swimming vests and lifeboats for over three hundred people.

### Interior Layout

The Bourno-class Yacht has a total of sixteen double-bed guest suites, fourteen double-bed guest cabins and twelve single-bed guest cabins, for 72 passengers in total, on the Cabin Deck. In addition to that, the owner has his own suite on the Bridge Deck. The guest cabins come with a small bathroom attached, the guest suites consist of three rooms including a bathroom.

The Owner's Suite consists of one sitting room in the center, a balcony overlooking the aft of the yacht behind that. From the sitting room, one can easily go into a study, a small library adjacent to that, a large bathroom, as well as two large bedrooms.

The entire interior of the vessel can be fitted out as the customer wishes, from modern art styles to classics like Art Deco to more traditional furnishings like the Kyrenaian Interior Design. The choices are completely up to the future owner and already included into the price.

The Crew, 98 ship's Crew and up to 150 people staff, is housed on Deck 5, the Crew Deck. Facilities like the onboard infirmary and the server room for the Onboard Entertainment Network are found on that deck as well.

The Promenade Deck is the place, where most of the life aboard will happen, as on this deck, the majority of the onboard facilities can be found: The Hall, which can be used as an extra-large dining room, the onboard 100-seat cinema, which can also be used as a theatre, the pool at the aft of the vessel, several salons and rooms for specialized services (for example for a massage salon) and a small bath house.

At the bow, the vessel has a small helicopter landing pad, but no other dedicated facilities to handle helicopters.

## History

The Bourno-class Yacht began it's life as a design study of SDY, exploring the capabilities and possible uses of tumblehome-hulls. As the results were described as 'lackluster' and 'bloody expensive to build and maintain' and 'has the reserve bouyancy of a brick', the hull form was not further pursued as the developments of the Aiteal-class Oceanographic Research Vessel (which ended up as a SWATH-Hull) and the Scoth-class Corvette (which ended up as a conventional monohull) continued.

However, the hull form, as those tests pointed out, had a few distinctive advantages: It was more stable due to the centre of mass being close to the waterline. This stability also also strengthened the hull.

The hull form was shelved, as it was not seen as a suitable form for warships designed by SDY.

However, the idea did not leave the heads, as tumblehome could be used to advantage outside of military applications – a stable working platform was, after all, a stable working platform, which could be used for a variety of purposes. Also, a stable vessel was much more enjoyable to cruise on then one rolling pitching all over the place.

Years passed and the shelved idea was brought forth every now and again, but only in a few cases honestly considered.

Then Miss Leia Leour of Willitya came forth, requesting a proposal to have a yacht built for her. Her request almost begged for experimenting and SDY was happy to oblige. After some consideration and a number of delays, SDY settled on a tumblehome hull design, the first put into service by us.

At a length of 220 metres, the Bourno-class Yacht will be one of the largest motor yachts in the world.