Page 33: of Maritime Reporter Magazine (October 15, 1981)

affected by the rpm of the main engine.

Notable features of the system include:

Adoption of the Omega clutch stabilizes the speed of shaft rev- olutions at the output even if the revolution speed at the input should change drastically. As a result, main engine-driven electric power generation becomes possi- ble even for vessels with fixed- pitch propellers, which normally makes such power generation dif- ficult.

As it enables the main engine to drive the generator, grade C heavy oil can be used in place of the normally used grade A heavy oil. The price difference between the two grades of heavy oil re- sults in a saving of 25 to 30 per- cent in power generation cost.

Smooth switch-over — without blackout as originally feared — from the main shaft-driven gen- erator to the independent auxil- iary generator in a crash astern while at sea or when navigating at slow speed in entering or leav- ing port, has been verified.

For additional information on

Niigata diesels and the power generating system,

Write 65 on Reader Service Card

OOSTERHUIS/

MITSUBISHI

During the late seventies, Oost- erhuis Industries researched the

U.S. domestic and foreign engine market for lower horsepower, high-rpm diesels capable of op- erating successfully on lower- quality fuel oils. This search re- sulted in the appointment of

Oosterhuis as distributors of SN and Daiya diesels for Mitsubishi

Heavy Industries America, Inc.

The high-speed Mitsubishi SN

Series diesel engines are manu- factured by Mitsubishi at its modern plant in Sagamihara near

Tokyo, and shipped to Ooster- huis in standard execution. At

Oosterhuis' facilities, engines are further packaged for U.S. do- mestic use, which includes the installation of U.S.-made SN full- flow lube oil filters, and the in- corporation of Synchro-Start overspeed devices and Murphy in- strument panels.

The Mitsubishi SN Series are available in a power range of 350 to 1,600-bhp as propulsion units for offshore supply vessels, tug- boats, pushboats, and for gener- ator drives and other applica- tions. The rpm ranges from 1,200 to 1,800 at maximum continuous rating.

Recent orders include quadruple engine installations for tug/sup- ply vessels utilizing two S16N and two S8N engines driving through hydraulic compound gears, with master and slave con- trols and fixed propeller. The 8- cylinder S8N starboard engine drives, while disconnected from the propeller shaft, a mud com- pressor by means of a front- mounted power take-off. The port- side S8N engine has a similar hook-up with a fire pump con- nected to a high-pressure, large- capacity fire monitor on deck.

Other quadruple installations call for use of four S16N engines with controllable-pitch propellers.

In addition to the packaging and marketing of Mitsubishi SN diesels, Oosterhuis Industries, through its affiliated company,

American Brons Corporation, maintains a license for manufac- turing of Turbodiesels designed by Brons Industrie of the Neth- erlands. The first American Brons diesels became operational during 1979. They have logged approxi- mately 10,000 hours, and have proven to be reliable and econom- ical to operate.

For additional information on the Mitsubishi SN Series and the

American Brons Turbodiesels,

Write 66 on Reader Service Card

PAXMAN DIESELS

U.K. engine builder Paxman

Diesels has developed a new su- percharged engine in a bid for submarine orders. Derived from

Paxman's Valenta engine line, the now model relies on a mechanical supercharger rather than a tur- bocharger. The company hopes that this engine will operate sat- isfactorily when a submarine is (continued on page 40)

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October 15, 1981 Write 3432 on Reader Service Card 37