Page 44: of Maritime Reporter Magazine (September 1986)

Alliance Launched (continued) tors, the propulsion motors are ar- ranged for thyristor control, and have special magnetic circuits and special ball bearings to meet acous- tic control requirements.

In essence, each main engine drives an AC generator, which sup- plies via thyristor converters the DC propulsion motors, each with a max- imum continuous rating of 1,890 kw at 1,200 rpm. Couplings between the stern tube shafts and the thrust shafts are of the SKF flange type, but the couplings between the main propulsion motors and thrust shafts are flexible.

Three diesel-driven 450-kw gen- erator sets are installed on resilient mountings for the ship's electrical services. Each has an Isotta Fras- chini 10 36SS 12-cylinder, V-type engine of 450 kw output, coupled on a common bedplate to an AEG 450- volt, 60-Hz generator.

Classed by the American Bureau of Shipping, the Alliance has an overall length of about 305 feet, beam of 50 feet, depth to weather deck of 28.5 feet, and scantling draft of 16.7 feet. The ship is designed for a maximum continuous speed of 17 knots, a free-running service speed of 16.3 knots, or a speed of 12 knots with a 20-ton tow.

Accommodations will be provided for a total of 50 persons, including scientists, officers, and crew, all in air conditioned cabins, mainly sin- gle-berth with private bathrooms.

This ship is fitted with bilge keels to insure stable working conditions as

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Sealift Command Plans To

Purchase Additional Ships

For Ready Reserve Fleet

The Navy's Military Sealift Com- mand will accept offers on Septem- ber 30 this year for various types of merchant ships to be procured dur- ing FY 87 that will become part of the Ready Reserve Fleet (RRF). In

January this year the Navy pur- chased 13 ships for the RRF at a cost of $206.7 million.

The RRF, a unit of the National

Defense Reserve Force, will consist of 83 ships by October this year. The

Navy is committed to achieving a goal of 120 RRF ships by the end of

FY 1992.

In the latest procurement, the

MSC will buy the most advanta- geous mix of militarily useful ships from among those offered on Sep- tember 30. The Navy intends to take delivery and become the owner of record of these ships not later than September 30, 1987.

The MSC's current priority is for clean products tankers in range of 20,000 to 50,000 dwt, followed by fast breakbulk ships capable of speeds greater than 20 knots. These would be modified later to provide underway replenishment capability.

The third priority at present is for semi-submersible, heavy-lift ships capable of lifting and transporting items weighing in excess of 1,000 long tons.

MSC To Procure Up To

Six Logistic Support

Vessels For U.S. Army

The Navy's Military Sealift Com- mand (MSC) has announced that it intends to procure on the open world market during FY 1986 up to six logistic support vehicles (SLV) from one or more offerers. If pur- chased from a foreign seller, the ves- sels must be reflagged and all con- version work performed in U.S. shipyards.

The Request For Proposal (RFP

N00033-86-R-4011) was issued by the MSC in July; proposals were due on August 22 this year. The

Navy is purchasing these vessels for the Army because of the Navy's extensive experience in securing shipping services for the Depart- ment of Defense.

When purchased, the LSVs will be used by the Army to transport dry cargo on the ocean and the coastal and inland waterways. They must be able to carry a minimum of 1,500-2,000 short tons of vehicles, containers, and/or general cargo.

The LSVs also will be used to assist in discharging and backloading ships during roll-on/roll-off opera- tions as well as logistics over-the- shore missions. The LSVs must also be capable of landing on remote and underdeveloped coastlines. 46 Maritime Reporter/Engineering News