Eco-Friendly Ocean Motor Yacht Design

Tuesday, October 27, 2009
Photo courtesy Bray Yacht Design & Research Ltd.

Designers Ken Freivokh, responsible for the Maltese Falcon; and Pat Bray, responsible for a fuel efficient, semi-displacement hull form, presented their latest project, an environmentally sound 137-ft motor yacht design.
Through the use of hybrid diesel/electric technology this vessel can operate for up to five hours on battery power alone, quietly slipping through the water at six knots. A 4,000 mile range at 14 knots is achieved with this low wake, low carbon footprint hull form. Superior seakeeping, a range of stability double that of most offshore vessels, a top speed of 16 knots, and the design offers comfort, economy and low environmental impact.

The design has been extensively tank tested to ensure superior seakeeping and powering characteristics. It is a conically projected, double chined hull with wide spray knocker and flared bow. The hull is longitudinally framed for maximum strength and ease of construction.

Advanced technology appendages, including a bulbous bow, midship bulbs, stern bulb, fixed/active stabilizers and a bi-foil under each CP propeller, are the features that make this vessel unique. In addition to exceptional fuel economy, over 35% better than most, these features give the vessel superior seakeeping ability as well as double the range of stability of other vessels. This vessel has in excess of a Trans-Atlantic range at 14 knot cruise as well as being capable of higher semi-displacement speeds for fast local cruising.

The interior showcases eco-friendly materials from renewable resources, blended by Ken into a cohesive whole. A variety of layouts await the client’s input to finalize this creative process. The spacious aft adventure deck will carry a mini-sub, seaplane and helicopter.

Length, o.a.    137 ft
Length, waterline    132 ft
Beam    28 ft
Draft    7 ft
Displacement    491,000 lbs.
Hull construction    Steel
Superstructure construction    Aluminium

Fuel    12,500 gal
Fresh water    3,000 gal
Grey & black water    700 gal each
New & used lube oil storage    150 gal each

Main engines (diesels)    2 x 900 hp intermittent rating
Gensets (diesels)    2 x 60 kW
Watermakers (reverse osmosis)    2 x 1,500 gal per day

Powering Predictions (estimated):
6 knots    2 x 45 hp hybrid, consumption 0 gal/hr range = 30 knt. miles
10 knots    2 x 158 HP fuel consumption 15.2 gal/hr range = 8200 knt. miles
12 knots    2 x 288 HP fuel consumption 26.4 gal/hr range = 5600 knt. miles
14 knots    2 x 470 HP fuel consumption 42.2 gal/hr range = 4150 knt. Miles
16 knots    2 x 843 HP fuel consumption 74.3 gal/hr range = 2690 knt. Miles

Stability (half loaded, intact, estimated)
Positive righting arm to 160 degrees
Max righting arm at 89 degrees
GM = 4.5 ft


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