APPLICATION OF THE VERTICAL-FLOAT CONCEPT TO A 1/20 SCALE PBM-5 SEAPLANE
GENERAL DYNAMICS SAN DIEGO CA CONVAIR DIV
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To more fully ensure the success of a proposed full-scale, vertical- float seaplane program, limited testing was conducted on a 120 scale PBM-5 seaplane model. The model testing was done during the summer of 1962 at the towing basin facility of Convairs Hydrodynamic Laboratory and in San Diego bay, adjacent to the laboratory. An analytical study was made to determine the size and position of the floats to be installed on this particular model. Tests were then conducted on both the hull configuration and the stable, vertical-float version, and comparative data was recorded for pitching, rolling, and heaving motions induced by wave action. The model tests indicated that a vertical float system can be designed for seaplanes such that only minor pitching and rolling oscillations will result in sea-state 4. With the employment of an optimum vertical float system, seaplane heaving will be of small magnitude in sea-state 4. Seaplanes with verlical floats have low drift rates when compared to conventional hulls. The over-all results of the model tests are satisfactory enough to warrant immediate full-scale investigation of this principle, including studies to determine its effectiveness in ASW.
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