Page 26: of Marine News Magazine (December 2010)

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Name BRAtt

Type Training Tug

Builder Adrenalin Marine Ltd.

The 450 hp BRAtt project evolved from Ron Burchett’s training programs for tug operators using radio-remote controlled scale models. With the help of designers Robert

Allan Ltd., Burchette decided to build a model large enough for the operator and instructor to ride on and learn in the same space frame of reference as the boat. In operation there is room for at most three people on the boat, but ideally just two. In addition to its training func- tions, the BRAtt can serve effectively as a real tug, doing smaller towing, docking and line-handling duties, and other harbor tasks such as boom deployment. The boat is outfitted with a fully operational Braden hawser winch forward with the tow line passing through a polished stainless-steel staple. The propulsion system on the BRAtt is scaled to proportionately represent the full size tugs. It features a pair of Cummins QSB5.9-230 HD engines, each delivering 225 hp at 2,600 rpm into engine mount- ed ZF280.1 gears with 1:1 ratios. To allow for further reduction below the engines’ 600 rpm idle, the gears have slipping clutches. Flexible Centa torsional couplings are installed between the engines and their gears. Additional flexible couplings are at either end of the drive shafts to reduce vibration and to accommodate any movement in the flexibly mounted engines. The Z-drives are Olympic

Model HD3 with 2:1 reduction. The propellers are 25.75- inch stainless in stainless nozzles. Both the engines and the

Z-drives are mounted with a five-degree angle upward to the stern.

Specifications:

Length, o.a . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .28 ft

Length, moulded . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .25.7 ft

Beam, o.a. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .16.3 ft

Beam, moulded . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .14.2 ft

Depth, moulded . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .6.2 ft

Load draft . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4.8 ft

Fuel oil . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .365 gal

Bollard pull (min.) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .8,000 lbs

Free running speed . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .8 knots

Main engines . . . . .Cummins QSB5.9-230 HD, 168 kW at 2,600 rpm

Gearbox . . . . . . . . . . . . . . . . . . . . . . . .ZF 280-1 gear with 1:1 ratio

Z-Drives . . . . . . . . . . . . . . . . . . . . . . . . .Olympic Drives model HD3 26 MN December 2010

Smith Berger Marine, Inc. builds a full range of Shark Jaws for Anchor

Handling Tug Supply vessels. Standard ratings are 100, 200, 350, 500 and 750 metric tons and all units have Quick Release at the rated load.

Smith Berger flexibility allows us to customize our equipment to suit the operating characteristics of your vessel. Third party certification, load tests, release tests and load monitoring systems are available options.

Rely on the 100 year history of Smith Berger to outfit your vessel with our rugged and dependable equipment.

SMITH BERGER MARINE, INC.

OFFERS A COMPLETE LINE OF

SHARK JAWS • TOWING PINS • STERN ROLLERS

Smith Berger Marine, Inc. 7915 10th Ave., S., Seattle, WA 98108 USA

Tel. 206.764.4650 • Toll Free 888.726.1688 • Fax 206.764.4653

E-mail: [email protected] • Web: www.smithberger.com

SAFE - RELIABLE - ECONOMICAL

MarineNews’ Great Boats 2010