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Giving the Results of Tank Experiments with Various Models THIS paper is founded on a series of experiments made by Mr. G. S. Baker and the author, at the William Froude National Tank, at the instance of the Advisory Com mittee for Aeronautics. The work consisted of designing and running a large number of models of hydro-aeroplane floats, some of which have been subsequently built to. The special apparatus employed and methods of experi ments are described in the Appendix, while the complete results are included in the Official Aeronautical Reports for 1912-13 and 1913-14. It should be borne in mind that the statements here made, and conclusions arrived at, are founded mainly on these model experiments, while many details can only be decided as the result of experi ence with actual machines. Hydro-aeroplanes may be divided, broadly, into two classes: (1) Those in which the machine follows the same general lines as a land machine, with floats substituted for the landing-gear; (2) those in which the fuselage is in the form of a boat containing the crew, and sometimes the engine. The term "hydro-aeroplane" is usually con fined to machines of the first class, those of the second being termed "flying boats." These two classes are being' By G. H. Millar, B.A. floats, which, of course, requires that the tail float shall take some of the load at rest. This also makes the machine float more steadily in a short sea, and allows an underwater rudder to be used to assist maneuvering on the water at low speeds. In any case the load on the tail float is small, and its design of no particular moment. Considering the main floats, the general balance of Speed (P'Ft. Sea,') FLAT PLATE RESULTS.