Principles for designing th3 optimum hull for. a large long-range flying boat to meet the requirements of seaworthiness, minimum drag, and ability to take off, and land at all operational gross loads were incorporated in a 1/12 size powered dynamic model of a four-engine transport flying boat having a design gross load of 165,000 pounds. These design principles included the selection of a moderate beam loading, ample forebody length, sufficient depth of step, and close adherence to the form of a streamline body.nThe aerodynamic and hydrodynamic characteristics of the model were investigated in Langley tank no. 1. Tests were made to determine the minimal allowable depth of step for adequate landing stability, the suitability of the fore-and-aft location of the step, the take off performance, the spray characteristics, and the effects of simple spray-control devices.
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