Water-landing investigation of a flat-bottom V-step model and comparison with a theory incorporating planing data

Author / Creator

Miller, Robert W., author

Available as

Online

Summary

A flat-bottom V-step mode having a beam loading of 4.6 was subjected to fixed-trim impacts in smooth water. The tests were made at trims of 4, 12, and 20 degrees and initial flight-path angles rang...

A flat-bottom V-step mode having a beam loading of 4.6 was subjected to fixed-trim impacts in smooth water. The tests were made at trims of 4, 12, and 20 degrees and initial flight-path angles ranging from 2.7 to 20.7 degrees. The data were obtained as time histories of draft, vertical velocity, and vertical acceleration.

The experimental results are presented as plots of nondimensional lift, draft, vertical velocity, and time against flight-path angle at contact. The trends of the results agree generally with those exhibited by models having transverse steps and high beam loadings.

Computed results determined according to the method presented in NACA TN 2814 for the calculation of hydrodynamic impact loads by the use of force-draft relationships obtained in planing are compared in time-history plots with experimental impact data. These comparisons show good agreement and indicate that this method can be applied successfully to the impacts of V-step models having high beam loadings.

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