Resistance Characteristics of the High Speed Transcom Stern Ship R/V athena in the Bare Hull Condition, Represented by DTNSRDC Model 5365
DAVID W TAYLOR NAVAL SHIP RESEARCH AND DEVELOPMENT CENTER BETHESDA MD
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Towing tank experiments were conducted on a 18.25-scale model of the RV ATHENA to provide data for comparison and evaluation of various analytical predictions. Measurements of total resistance, wave pattern resistance, bow and stern sinkage and wave heights along and behind the hull were made a Froude number range of 0.28 to 1.00 with the model free to sink and trim, and captive at zero trim and sinkage. These measurements are compared with an analytical prediction and with measurements made on a 114.67-scale model. Wave pattern resistance coefficients of the two scale models agree well between Froude numbers of 0.28 and 0.65. The analytically predicted wave resistance values exceed the measured wave pattern resistance values. The residuary resistance coefficients of the large model are similar in trend to those of the small model for F sub n 0.35, and are less than the predicted analytical values throughout the speed range. The presence of a stern wedge on the large model results in less sinkage and trim and slightly smaller values of residuary resistance at Froude numbers above 0.35, when compared to the analytical results and the experimental results of the small model. The reported measurements provide a basis for evaluation of future analytical computations of resistance characteristics for high-speed transom stern ships.
- Marine Engineering
- Fluid Mechanics