MEASUREMENTS OF THE TURNING PERFORMANCE OF THE LVT-P5.
WALKER (NORMAN K) ASSOCIATES INC ROCKVILLE MD
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The report describes the results of a detailed investigation of turning performance at two engine speeds in calm and in rough water by the use of a movie camera fixed to the LVT-P5 and another monitoring the track of the vehicle from a helicopter. It was found that the radius of turn was from 70-78 feet--in good agreement with the 75 feet quoted in the standard characteristics, but that the actual rate of turn was greatly reduced by a reduction in engine speed from 2400 rpm to 1600 rpm or by moderately rough water. Sea State 1 The forward speed in a turn was much reduced, partly by extra drag, and because only one track was then exerting thrust, and a check of straight-running characteristics showed that the frequent use of steer was required with a consequent reduction in speed, since it was difficult to trim the vehicle to run straight hands-off. It is recommended that the model test be extended to cover the design of an auxiliary hydrodynamic control so that the vehicle may be steered without slowing the tracks. It is also recommended that similar full scale tests should be made of newer types of amphibian as these are delivered, and an improved technique is described. Author
- Marine Engineering