have estimated that up to 80 percent of the underwater noise a ship produces dertook preliminary consultation with key vendors to deter- comes from cavitation at the propeller; therefore the study mine how propulsion systems could be best optimized for focused on propeller design (Figure 3). Cavitation
the impeller on the water pumper, “It would max out at Research Fleet, an important asset to U.S. oceanographic re- about 270 rpm, it would start to cavitate and it would shake the search due to its range, payload, duration, and ability to safely entire boat.” As Appelgate and his scienti? c colleagues
Symposium Slated For May 1978 At Virginia Beach, Va. A technical symposium on ships' propellers will be held on May 24 and 25, 1978, at the Cav- alier Hotel, Virginia Beach, Va. Entitled "Propellers '78," the sym- posium is to be jointly sponsored by Technical and Research Panel M-16
an overview of a va- riety of wave and current energy conversion systems. Wave energy extraction systems included heav- ing/pitching/rolling, Mazuda (cav- ity resonator), wave focusing, pressure actuated, and rotating devices, while the current energy extraction devices covered rotary (axial
steel propellers will reduce the capital costs of propellers and the cost of cathodic protection by providing the necessary protec- tion against cavitation erosion, erosion and galvanic corrosion while providing a smooth surface. For existing bronze propellers, the covering systems will reduce
from side to stern trawling. Various de- signs evolved during this period are discussed. Paper No. 5—"The Construction assistance Vehicle (CAV), An Un- derwater Pickup Truck" by S. Hal- pern and S.A. Black. The construc- tion assistance vehicle is a free- flooding, electro-hydraulically
vessel can be significantly reduced compared with a conventional ex- posed propeller system. Paper No. 5. "The Construction Assistance Vehicle (CAV), an Underwater Pickup Truck" by S. Halpern and S.A. Black. Synopsis—The Construction Assistance Ve- hicle (CAV) is a free-flooding, electro-hy- drauli
Deep-Ocean Mining Ship," by R. Kaufman and J.P. Latimer; "Fishing Vessel Development," by D.J. Doust, and "The Construction Assist- ance Vehicle (CAV), an Underwater Pickup Truck," by S. Halpern and S.A. Black. To be presented Thursday, May 27, are the following papers: "An Underwater Buoyancy
from France in 1800. Her first cargo consisted of anhydrous ammonia from Beaumont, Texas, to Gibbstown, N.J., where Du Pont has an underground storage cav-ern for this chemical intermediate. Principals at the christening of the Marine Eagle at Newport News Shipbuilding Co., left to right: D. A. Holden
' o^foP process. ? vC ,V ^ «s<* a VK © * c? Ply sn
wide range of ship size and type (60m3 up to 5000m3), Hyde has been speciÞ ed in some smaller research hulls. About 15% of their orders are for retroÞ ts. Caveats The trade-off with this system is the larger Þ lter(s) which provide better performance. This balances the smaller UV footprint. Increase in
with blowers supplying air through porous plates in the side andbottom plating showed a resistance re- duction of only 1% to 2%.POWER SAVINGS A series of cavities in the hull filled with air, whereby the boundary layer isremoved altogether, proved to be far more effective. However, a poorly de- signed cavity
data sets coming from differ- ent data sources. The software allows users to validate and combine bathy- metric data sets as input for further. CaviDyne, LLC P.O. Box 358628 Gainesville, Fla. 32635 Tel: (352) 275-5319 Email: [email protected] www.cavidyne
GREAT SHIPS OF 1998 IHI's P&O Nedlloyd Southampton (Continued from page 41) population of RTA84C container- ship engines, but in a bank of cav- ernous cylinders of 960-mm bore and 2,500-mm stroke. Reliability was a focus for the RTA96C development project, given the nature of market demand
equip- ment and supplies on the Missis- sippi River in support of mat sink- ing operations. To hold the river in a desired alignment and prevent bank cav- Harding Safety A.S. Lands Major Orders For Lifeboats And Davits Harding Safety, a company in the Ulltveit-Moe group, Norway, has won a contract
, such as MAN, MAN B&W, Sulzer, Pielstick, Mercedes-Benz, and KHD. MD offers a full line of fuel injection equipment comparable with Robert Bosch, CAV, Duap, L'Orange and others. For additional information on Monark Diesel, Circle 75 on Reader Service Card For additional information on MAN-Power
on the market—low-speed, medium-speed and high-speed units; two-stroke and four-stroke cycle designs; cross-head- and trunk-piston types; loop-scavenged styles; and conventional and opposed-piston machines—the editors of MARI- TIME REPORTER asked the ma- jor makers of marine diesel engines
ships—low-speed, me- dium-speed and high-speed units; two-stroke and four-stroke cycle de- signs; cross-head- and trunk-piston types; loop-scavenged and uniflow- scavenged styles; and conventional- and opposed-piston machines. Ap- plication, engine availability range, fuel economy, fuel