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Sperry Appoints New Program Manager Sperry Corporation, Charlottes- ville, Va., has appointed George Tsirimokos to the position of pro- gram manager of its satellite com- munication program in the marine systems unit in Charlottesville. Mr. Tsirimokos will oversee Sperry's introduction of advanced computer and communications products into the maritime indus- try. In addition to the new MCS2 series ship earth stations and the integral ruggedized 300 MC marine computer, Sperry offers a complete line of software programs for per- sonnel administration, payroll, planned ship maintenance, cargo loading and spares inventory con- trol. For free literature containing complete information on Sperry products, Circle 8 on Reader Service Card SAME DAY SERVICE ON INQUIRIES AND SHIPMENTS TROYji T.A. & D.A. TROY CO., INC. EASTERN STATES CORPORATE OFFICE 315 Fairfield Road Fairfield, N.J. 07006 N.J. 201-228-3553 FAX: 800-772-3693 TELEX: 219285TROYUR WESTERN STATES 5787 Washington Blvd. Commerce, Calif. 90040 213-726-7060 PROPULSION UPDATE Volvo Penta's New 61 And 71 Series For Workboats Developed Using Advanced Computer Techniques Trademark of INCO Volvo Penta's new 61 and 71 Se- ries are two new designs developed with the aid of advanced computer techniques. These in-line six-cylin- der marine diesels are direct in- jected, turbocharged and after- cooled and are said to give the boat operator outstanding performance, increased operational reliability, re- duced exhaust emissions, and im- proved overall economy. In order to give the engine block maximum rigidity without increas- ing the total weight, Volvo Penta has exploited the latest computer techniques (Finite Element Analy- sis), making it possible to signifi- cantly increase power outputs com- pared to previous 6- and 7-liter die- sel engines. The TAMD 61A and 71A have the following advanced features: new cylinder head with flame barrier that increases gasket life; new meth- od for tightening the cylinder head bolts, each bolt having exactly the same torque for improved sealing; new cylinder head intake and ex- haust channel design giving an iden- tical swirl characteristic for each cylinder, reducing smoke and in- creasing fuel efficiency; front end mounted junction box for all electri- cal connections and relays, simplify- ing installation and service, particu- larly twin installations; new gear- driven fresh-water circulation pump for higher efficiency and reduced noise and vibration; plate type oil cooler provides more effective cool- ing of the engine oil; adjustable rear engine brackets for easier installa- tion; new adjustable anti-vibration mounts reduce vibrations transmit- ted to the hull and thereby reduce noise and increase comfort. New technical developments have made it possible to achieve an ex- tremely low weight/power ratio— 2.2 kg/hp for the TAMD 61A and 2.3 kg/hp for the TAMD 71A with the output set for light duty opera- tion. Increased power outputs have been possible through further devel- opments of direct injection, turbo- charging and aftercooling technolo- gy- The engines are fitted with oil- cooled pistons that reduce the buildup of carbon deposits. In addi- tion, there is a new type of thermo- stat and gear-driven fresh-water pump. These are some of the de- tailed improvements that contrib- ute toward high operational reliabil- ity and long service life. Air pre-heating means easier starting in extreme weather condi- tions and reduced exhaust smoke during the start-up phase. Further- more there is a pressure regulator that allows the heated air from the turbocharger, at pressures below 0.3 bar, to bypass the aftercooler and pass directly into the intake mani- fold. This leads to a cleaner exhaust at idle speed and low load operation. The engines are also equipped with fuel injection pumps fitted with smoke limiters for reduction of black exhaust emissions during ac- celeration. Simple installation and simple service are of utmost significance for overall economy and special empha- sis has been placed on these aspects during the design phase of the new 61 and 71 Series. Some examples reflecting this are the cable harness from the instrument panel can be directly coupled to the engine's elec- trical components through the use of plug-in connectors; the seawater pump, oil filter and oil filler are placed for ease of accessibility at the front end of the engine. Engine specifications are easily adapted for different boat types and applications thanks to the wide range of optional equipment such as heat exchanger or keel cooling sys- tems, extra alternators, 12V or 24V electrical systems, extra power take- offs, bilge and deckwash pumps, front end mounted oil filter and adjustable anti-vibration mounts. The transmission program has been selected to suit varying boat types, from heavy displacement boats to light planing craft. The program ranges from the MG506 to the MG509 and also includes the new MG506A with a 10° down angle output shaft. A choice of reduction ratios are available from 1:1 to 4.95:1. For free detailed literature fully describing the new 61 and 71 Series from Volvo Penta, Circle 69 on Reader Service Card Volvo Penta's new TAMD 61A. Circle 285 on Reader Service Card 10 Volvo Penta's new TAMD 71A. Maritime Reporter/Engineering News
