Accession Number : AD0627250

Title :   SEAWORTHINESS CHARACTERISTICS OF A GROUND EFFECT MACHINE OBTAINED FROM MODEL TESTS OVER REGULAR WAVES.

Descriptive Note : Final rept.,

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

Personal Author(s) : Gersten,Alvin ; sheehan,Joseph M.

Report Date : DEC 1965

Pagination or Media Count : 34

Abstract : A model representing a ground effect machine (GEM) designed by the Bureau of Ships for over-water operation was towed over regular waves allowing freedom in pitch and heave. The tests were conducted with the craft traveling in following seas. Measurements were made of the resulting motions, drag forces, and accelerations. The data reveal that at speeds up to 40 knots, the pitching motion per unit wave height of the GEM is generally more severe than that experienced by conventional small craft and large oceangoing ships. The heaving motion per unit wave height of the GEM is also greater than the characteristic heaving motion of more conventional vessels. It was also determined that pitch and heave motions and surge force are linearly related to wave height throughout the range utilized in these tests. Wave steepnesses as great as 1/32 were investigated. (Author)

Descriptors :   (*GROUND EFFECT MACHINES, MODEL TESTS), (*WATER WAVES, GROUND EFFECT MACHINES), MOTION, DRAG, ACCELERATION, PITCH(MOTION), SHIPS

Subject Categories : Surface Effect Vehicles & Amphibious Vehicles

Distribution Statement : APPROVED FOR PUBLIC RELEASE