Page 63: of Maritime Reporter Magazine (September 1998)

Hydraulic

WESTERN MACHINE WORKS 1870 Harbour Road - North Vancouver, BC - Canada - V7H 1A1

Phone: (604) 929-7901 Fax: (604) 929-7951

Features: 0 Hard wearing manganese steel vertical rollers rotating on bronze bushings 0 Optional tow line hold- down and stern rollers available 0 8" and 12" diameter pins now available with 12" or 16" vertical rise 0 3,4 or 5 pin models and compact unit available

Call or Fax for our free brochure xiiies Diesel Electric Propulsion

Trimaran Helps to Keep Vosper rhornycroft at Forefront of Technology

Vosper Thornycroft's (VT) winning of the intract to design and build the first trimaran arship demonstrator, RV Triton, will main- lin the company's position as a world leader a naval ship technology.

The Defence Evaluation and Research

Agency (DERA) awarded the contract for the 295.3 ft. (90 m) long warship. One of the pur- poses of the demonstrator will be to deter- mine whether a trimaran hull form will be Vessel Specifications suitable to be considered for the Future (all data are approximations)

Escort, to replace the current Type 22/23 L0A. 318 2 ft (97 m) frigates. In addition to DERA's work on tri- LWL: 295.3 ft. (90 m) maran hull forms, VT carried out its own Side hull LWL: 111.5 ft. (34 m)

R&D program, consisting of taking the com- Beam: 73 8 ft- '22-5 pany's design of a vessel, and applying the £ i;;;;;"^^ same payload to a trimaran design. This was Max drought: )0 5 ft_ (3 2 m) found to produce considerable fuel savings, Displacement: 1,100 tons reductions in through-life costs and opera- Speed: Maximum 20 knots tional advantages. VT has a long tradition of ProPulsion: Diesel Elet,ric Pr°Pulsion- producing innovative ship designs, both for Single-shaft, fpp & independent i n i . side hull propulsion the British Royal Navy and overseas navies. E|ectrica| supp|ies. 440 v 60 Hz. 230 v

Among the more notable achievements have 60 Hz; 115 V 60 Hz& high been the construction of the world's first voltage propulsion bus bar fibre-reinforced plastic minehunter, HMS ^w accommodations: 12

Wilton, in 1970; design and build of the Royal Commumtalions: ' 'NMARSAT with modem

Navy's Type 21 frigate and the design and Two 25W fully synthesized build of the Sandown Class minehunter, rec- marine duplex FM VHF ognized as the world's most advanced mine- UHF AM military radio transceiver hunter Internal communications system

Trrr, , , ., , . *, ,", i . Navigation fti/Bridge: .. .S band & X band

VI naval architects are convinced the tri- Type Approved ARPA radars maran concept has considerable potential as GPS (Differential and advanced TIS a warship, and believe the adoption of a Differential GPS system demonstrator program will make the U.K. including attitude sensing) the focus of naval ship design for the new mil- Elf °"ic chnr, r^ stem; E , . , , , ., , , Doppler Log; Fax Weather Receiver; lenmum. Plans are to launch the demonstra- Remo(e m datQ K(ess tor vessel in Spring 2000.

DERA's research followed up the research performed by the MOD sponsored chair at University college in London, in the late 1980s. Trimarans have been extensively used in the design of commercial yachts, but in that case, design requirements are com- pletely different. Scaling up would not be representative of a warship.

Additional advantages to the vessel include:

Seakeeping: Improved seakeping performance compared with a sim- ilar displacement monohull, allowing higher speed to be maintained in heavy seas.

Flexibility: Larger deck area amidships allowing space for an addi- tional helicopter if required and increased helicopter availability through siting the flight deck in the amidships region where motions are reduced.

Vulnerability: Limited stand off protection provided by the side- hulls against smaller sea-skimming missiles, and improved survivabili- ty following underwater explosions.

Signature: The possibility of exhausting between the side-hulls is

Circle 330 on Reader Service Card #Quatech

Stainless Boat Shafting 21st Century Shafting Technology distributed by

Gulf Global, Inc. 700 Peters Road, Suite C • Harvey, LA 70058 • Telephone: (800) 817-0895 • Fax (504) 367-8557

JjL t's tough to stay ahead In today's competitive market. But

Aquatech stainless steel shafts give you the edge.

Manufactured by Atlas Specialty Steels exclusively for Gulf

Global, Aquatech shafts are state-of-the-art and built to last.

Call your Gulf Global representative today to learn more about the shaft that goes the distance.

MR/EN Marine Propulsion Supplement * September 1998 Circle 246 on Reader Service Card prop-17