Accession Number : AD0650522

Title :   SPEED REDUCTION IN WAVES,

Corporate Author : DAVID TAYLOR MODEL BASIN WASHINGTON D C HYDROMECHANICS LAB

Personal Author(s) : Bledsoe,Margaret D.

Report Date : APR 1958

Pagination or Media Count : 37

Abstract : The report presents the results of an experimental study to determine the effect of various parameters governing speed reduction in a seaway. Models of three typical ships (block coefficients varying from 0.50 to 0.75) were tested in head seas in regular waves, ranging in length from approximately one-half to twice ship length, for several wave heights and still water thrusts. The speed loss due to the added resistance in waves was determined for each condition. The results are presented in the form of graphs showing the critical wave length (wave length for maximum speed loss) as a function of wave height and still water speed. Also included are plots showing the percentage speed loss for constant wave lengths as a function of the above parameters; and contours of constant speed loss in waves of various lengths and heights. Finally, graphs are presented comparing the performance of the three vessels. (Author)

Descriptors :   (*SHIP MODELS, *DRAG), (*OCEAN WAVES, DRAG), VELOCITY, REDUCTION, PERFORMANCE(ENGINEERING), MODEL TESTS, DESTROYER ESCORTS

Subject Categories : Marine Engineering

Distribution Statement : APPROVED FOR PUBLIC RELEASE