Accession Number : ADA055014

Title :   Flow Observations and Speed Loss Prediction for USNS WYMAN (T-AGS-34) with an External Bottom Topological Survey System (BOTOSS).

Descriptive Note : Final rept.,

Corporate Author : DAVID W TAYLOR NAVAL SHIP RESEARCH AND DEVELOPMENT CENTER BETHESDA MD SHIP PERFORMANCE DEPT

Personal Author(s) : Day,William G. , Jr

Report Date : MAY 1978

Pagination or Media Count : 25

Abstract : The USNS WYMAN (T-AGS-34) has experienced a significant loss of operational time due to air bubbles masking its Bottom Topological Sonar Survey System (BOTOSS). A keel mounted fairing and foil have been designed to house the transmitting and receiving elements of the BOTOSS system. An experimental program was conducted on a hull model of the WYMAN to examine the flow around the hull and BOTOSS appendages, and to predict the loss of speed with the BOTOSS foil and housing fitted to the ship. The results of the experiments with the model indicate that the air bubble masking problem should be decreased significantly with the new design. The estimated speed loss is about 1.3 knots (0.67 m/s) at 3000 shaft horsepower (2240 kilowatts). (Author)

Descriptors :   *MODIFICATION, *SHIP HULLS, AIR, TEST METHODS, ACOUSTIC DETECTION, REDUCTION, MODEL TESTS, BUBBLES, POWER, LOSSES, OCEAN BOTTOM TOPOGRAPHY, MASKING, SONAR TRANSDUCERS, SURVEYING(GEOGRAPHIC), SONAR SIGNALS, MODEL BASINS.

Subject Categories : Marine Engineering

Distribution Statement : APPROVED FOR PUBLIC RELEASE