. Analysis of test data on the performance characteristics of planning and displacement floats for supporting submerged loads. Towing; Pontoons. Towing Speed, Knots Towing Speed, Knots. Towing Speed, Knots Figure l8 - Photographs of TMB tfl-Inch Planing Float Being Towed These tests were made under loads imposed by the 100-pound weight towed from the forward towpoint. An indication of the magnitude of the oscillations that were ob- served near the region in which signs of porpoising appeared can be obtained from Figure 20. In this figure, the curves of variations in drag about the
. Analysis of test data on the performance characteristics of planning and displacement floats for supporting submerged loads. Towing; Pontoons. Towing Speed, Knots Towing Speed, Knots. Towing Speed, Knots Figure l8 - Photographs of TMB tfl-Inch Planing Float Being Towed These tests were made under loads imposed by the 100-pound weight towed from the forward towpoint. An indication of the magnitude of the oscillations that were ob- served near the region in which signs of porpoising appeared can be obtained from Figure 20. In this figure, the curves of variations in drag about the mean drag have been traced directly from the recording tapes on the carriage dynamometer. In the first three records at the top of the figure, no well- defined oscillations in pitch could be observed visually. For the remaining conditions, , loads imposed by the 75-pound weight towed from the after towpoint, oscillations in pitch seemed to be very gentle when observed visu- ally. However, the actual amplitude of the variation grows with speed, al- though the frequency appears to remain fairly constant. These curves probably do not represent accurately the actual modes of porpoising of a free float, in which the equivalent load is built into the float, because during the tests an effective spring action resulted from the curvature of the towing cable to the faired Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Eisenberg, Phillip; David W. Taylor Model Basin. Washington, D. C. : Dept. of the Navy, David Taylor Model Basin
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License: Licensed
Model Released: No
Keywords: ., bookcentury1900, bookcollectionameri, bookcollectionbiodiversity
