HYDRODYNAMIC IMP ACT-LOADS INVESTIGATION OF CHINE-IMMERSED 0° DEAD-RISE CONFIGURATIONS HAVINGnLONGITUDINAL CURVATUREnWITH AN APPENDED BIBLIOGRAPHY OFnLANGLEY IMPACT BASIN HYDRODYNAMIC PUBLICATIONS

摘要

To investigate the relationship of bottom configuration to hydrodynamic impact loads, tests were made of two 0° dead-rise, narrow-beam configurations;one having the forward half curved upward, -the other having the same curvature over the rear half. The tests were made in smooth water over a range of flight-path angles at several fixed trim angles with beam-loading coefficients of about 18, 29, and $6.nThe load, motion, and moment data obtained at impact from both configurations and the maximum-pressure data for the curved-stern configuration are presented in tabular form. The results are plotted in coefficient form, and some typical time histories are also presented. The trends of the coefficients with initial flight-path angle, trim, and beam loading for both configurations are generally similar to those exhibited by other chine-immersed models. Comparison of the results for the two configurations at positive trims revealed no significant differences due to longitudinal curvature, but comparison at 0° trim indicated load alleviation by the curved stern.