Bray Yacht Design Motoryacht

New construction design from Patrick Bray of Bray Yacht Design and Research featured in Yachts International magazine 2011.

OVERVIEW 42m OCEAN MOTORYACHT

This long-range motoryacht will be based primarily in the Mediterranean for a client who enjoys extensive outdoor activities. There is spacious accommodation for 14 guests and up to 10 crewmembers. It has a super fuel-efficient, semi-displacement hull form that is a progression of our extensively tank tested hull technology to ensure superior powering characteristics and seakeeping. The hull is a conically projected, double chined form with wide spray knocker, flared bow, and a transom stern. It is longitudinally framed with wide spaced transverse frames for maximum strength and ease of construction.
Advanced technology appendages, including a bulbous bow, midship bulb, stern bulb, fixed/active stabilizers, and a bi-foil under each propeller, are the features that make this vessel unique. In addition these features give the vessel superior seakeeping ability as well as having double the range of stability of other vessels.
This vessel has in excess of a Trans-Atlantic range at 12 knot cruise as well as being capable of higher semi-displacement speeds for local cruising.

PRINCIPAL DIMENSIONS (approx.)
Length Overall 42m (137'-10")
Length Waterline 36.88M (121’-0")
Beam 9.24m (30'-4")
Draft 2.75m (9'-0")
Displacement (S.W.) 272 M Tonnes (600,000 lbs.)

CONSTRUCTION
Hull Construction Steel
Superstructure Construction Aluminium
Class Lloyd’s Register

TANKAGE
Fuel Capacity 37,850 L (10,000 US gal.)
Fresh Water Capacity 11,350 L (3,000 US gal.)
Grey & Waste Water Capacity 1,900 L (500 US gal. each)
New & Used lube oil storage 375 L (100 US gal. each)

MACHINERY
Main Engines 2 x 1000 HP Intermittent rating
Gensets (diesels) 2 x 65 kw (50 Hz)
Watermakers (reverse osmosis) 2 x 1,000 US gal. per day

POWERING PREDICTIONS (estimated)
12 knots: 1 x 450 HP fuel consumption 24.0 gal/hr range = 5000 knt. miles
14 knots: 2 x 440 HP fuel consumption 46.0 gal/hr range = 3000 knt. miles
16 knots: 2 x 1000 HP fuel consumption 106 gal/hr range = 1500 knt. miles

STABILITY (half loaded, intact, estimated)
Positive righting arm past 160 degrees
Downflooding point past 60 degrees
GM = 4.0 ft.

MAIN ENGINES
2 x 1000 hp diesels with underwater exhaust (MAN).

SHAFTS AND PROPS
2 x standard shafted 4 blade high performance props.

FUEL MANAGEMENT
A Racor filter and fuel management system shall be installed.

WATERTIGHT BULKHEADS
4 watertight bulkheads make for 5 watertight compartments.

SEACHEST SYSTEM
All seawater entering the boat comes in through 2 large Seachests with removable tops fitted above the waterline that may be opened when afloat to remove obstructions.

WASTE MANAGEMENT
A waste treatment plant shall be installed to latest regulations.

GROUNDING PLATE
A 1” thick heavy grounding shoe runs the full length of the keel bottom

FIXED/ACTIVE STABILIZERS
A stabilization system shall be installed utilizing a Key Power hydraulic system. Shipyard to fabricate the fins to a Bray Yacht design.

BOW THRUSTERS
Hydraulic thruster to be fitted in the bow.

BOW ANCHOR WINDLASS
Muir windlass with power up and down switches

DINGHY DAVIT
An electric dinghy davit system capable of 1,600 kg (3,500 lbs.) lift at 6.7m (22’) reach shall be fitted in the dinghy garage.

TRANSOM
The transom door shall fold down to become a swim beach. A section shall also lowered into the water to use for diver access (Opacmare).

HARDTOP
Fixed hardtop with radar arch style mast.

GENSET
2 x Northern Lights diesel 65 kw 50 cycle genset with sound shield

AIR CONDITIONING
14 zone air-conditioning system fitted with chill chasers.
9 air changes per hour for all Accommodation areas.

BATTERY BANKS
Arranged into systems of priority. One system for starting the main engines, one for the gensets, and one system for house power.

INTERIOR
A quality yacht interior shall be fitted but without the need for the use of marble or gold fixtures. Interior cabinetry shall be American Walnut. Light cream carpets fitted throughout. Leather seating on all furniture.

EXTERIOR
House and hull to be faired and painted above the waterline. Teak decks to be installed.

PASSARELLE
A retracting boarding gangway shall be fitted into the stern (Opacmare).

TANKS
The fresh water tanks are non-integral stainless steel. All the other tanks are integral under the lower sole.

PRESSURE WATER SYSTEM
Providing 40 – 60 p.s.i. continuous pressure.

CONSTRUCTION
The entire hull is designed without any compound curves eliminating the need for any stretch forming of plates. The double chined hull is conically projected so that large sheets of steel may be applied without any need for forming or machine bending. The transverse frames are flanged plate spaced at 1.067m (42”) centers with longitudinals sprung into place at 0.46m (18”) centers. There is approx. 136,100 kg (300,000 lbs.) of steel in the hull and 22,750 kg (50,000 lbs.) of fiberglass in the vessel’s superstructure.
Maximum sound levels shall not exceed the following levels (dB A weighted) at 12 knots cruise speed:
Owner’s Accommodation - 55
Guest Accommodation - 60
Public rooms - 60
Recreational decks - 65
Crew cabins - 60
Crew day room - 65
Bridge - 65

ALL RIGHTS RESERVED
This information, all associated materials and their contents are the physical and intellectual property of
BRAY YACHT DESIGN AND RESEARCH LTD
and may not be copied, duplicated, given out, or used without their prior written permission

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