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New Mono Hull Form (continued) vessel form when applied to a drill- ship application can be summarized as follows: • Excellent motion characteristics that approach those of a comparable semi-submersible. • Economical advantages in hull fabrication due to the use of straight-line framing and develop- able surfaces for a single hull. • High payload to displacement ratio when compared with a semi- submersible. The variable load (drilling supplies) of this ship is 9,000 short tons, while a comparable semi-submersible would have 4,000 short tons. • Large usable deck area in com- parison with a conventional drill- ship is a direct result of the hull con- figuration having a beam of 96 feet, compared with a drillship with a beam of 70-75 feet. This beam in- crease accommodates drilling equipment and provides ample space for storage and working pur- poses. • Safety: substantially improved intact stability characteristics at large angles when compared with a conventional drillship, thus incor- porating a major advantage of a semi-submersible. • The hull configuration provides TROUBLE-FREE... OR JUST TROUBLE? Compromising quality and dependability to save a few dollars can result in more trouble than you ever imagined. While saving money is important, what's more important—trouble- free valve operation or saving a few dollars on the initial valve cost? Designed and manufactured by craftsmen with no shortcuts in materials or features, Stockham offers a full line of quality bronze, iron, steel, stainless steel, ball and butterfly valves. Our extensive distributor network is backed by our own factory sales representatives and eight strategically located Service Centers that contain large inventories. To make sure that you stay out of trouble, specify Stockham. H STOCKHAM VALVES & FITTINGS Making your job easier Box 10326 Birmingham, AL 35202 U.S.A. Telephone (205) 592-6361 TWX 810-733-5545 Telecopier (205) 591-1300 Oblique View on Bow of a Scale Model Oblique View on Stern of a Scale Model good structural integrity when com- pared with a semi-submersible. For further information and a complete copy of Waller Marine's report on the mono-hull form, Circle 21 on Reader Service Card Waukesha Publication Promotes Operation And Maintenance Of Engines New developments in engine con- trol technology are explored in a special 12-page issue of the Wauke- sha Maintainer, a publication from Waukesha Engine that promotes proper operation and maintenance of all makes of gasoline, diesel and natural gas engines. Articles in the publication explain the use of electronic controls in reg- ulating air/fuel mixtures and in gen- eration of power by internal com- bustion engines. Proper procedures for maintaining solid state ignition systems are also discussed. An additional article traces the evolution of engine control and de- scribes the latest developments in electronic control technology and where it is likely to lead in the future. For a copy of the Waukesha Maintainer, Circle 71 on Reader Service Card •*• Circle 156 on Reader Service Card
