Accession Number:

AD0269765

Title:

EXPERIMENTS ON ROTATIONAL IMPACT

Descriptive Note:

Corporate Author:

DAVID TAYLOR MODEL BASIN WASHINGTON D C

Report Date:

1961-10-01

Pagination or Media Count:

17.0

Abstract:

The results of an experimental investigation to determine the pressures produced on the bottom of a slamming ship when impact with the smooth water surface results from simple rotation in the plane of symmetry are presented. The effect of forward speed of advance is not included. Graphs are included which show pressure dependence on time and on shape for a particular transverse section. A comparison of experimental and theoretical average pressures for this station shows good agreement in magnitudes for the theoretical computations available. It is necessary to consider only those pressures which occur a short time after the keel contacts the water surface. Thus the proper application of the theory requires that the immersion be small, but greater than zero. With this restriction an examination of maximum pressures over the forward 22.5 percent of the ships length shows that the region experiencing the highest pressures is located approximately at 9 percent of the ships length aft of the forward perpendicular. Author

Subject Categories:

Distribution Statement:

APPROVED FOR PUBLIC RELEASE