Towing Tank Tests on a Large Six-engine Flying Boat Seaplane, to Specification 10/46 Princess PART Ⅰ General Porpoising Stability, Trim and Spray Clearance

摘要

This report gives the results of the first series of towing tank tests made at the Royal Aircraft Establish¬ment Towing Tank (up to May 1947) on a powered dynamic model of a six-engine transport flying boat, later named the Princess class, and designed to specification 10/46, on the basis of which full-scale hull construction was started;later tests have been made to further improve the hull step and afterbody and test the effect of modifications to the aerodynamic superstructure and power units.nImprovement of the overload conditions was obtained as a result of a later major redesign of the aerodynamic super-structure to suit larger power units. Model technique improvements to obtain increased wing lift and damping more comparable with full-scale also showed the present model results to be pessimistic. These results and tests, also made to improve the hull step and detailed hull afterbody design are to be published as Part II of this report.