The emergence and planing-spray characteristics of flat-bottom sur¬faces representative of hydro-skis with various bow shapes and deflectors were investigated for trims of 12° and 20° and a speed of 30 feet per second. The emergence-spray characteristics of the models with various bow shapes were investigated for depths of submersion of the bow from 0.50 inch to -0.50 inch. The planing-spray characteristics of the models with the various deflectors were determined for a draft corresponding to a length-beam ratio of 4. The emergence- and planing-spray patterns are shown in the photographs taken from forward of and above the models and from the side of the models.nThe most favorable emergence spray was obtained with a bow of tri¬angular plan form and sharp profile. The greatest improvement in planing spray was obtained with vertical chine strips and a transverse barrier strip located forward of the wetted planing area.
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