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  Partner: UNT Libraries Government Documents Department
 Collection: Technical Report Archive and Image Library
Tank tests of twin seaplane floats

Tank tests of twin seaplane floats

Date: October 1, 1928
Creator: Herrman, H; Kempf, G & Kloess, H
Description: The following report contains the most essential data for the hydrodynamic portion of the twin-float problem. The following points were successfully investigated: 1) difference between stationary and nonstationary flow; 2) effect of the shape of the step; 3) effect of distance between floats; 4) effect of nose-heavy and tail-heavy moments; 5) effect of the shape of floats; 6) maneuverability.
Contributing Partner: UNT Libraries Government Documents Department
Tank tests of two floats for high-speed seaplanes

Tank tests of two floats for high-speed seaplanes

Date: November 1, 1933
Creator: Bell, Joe W
Description: At the request of the Bureau of Aeronautics, Navy Department, a study of the design of floats especially suitable for use on high-speed seaplanes was undertaken in the N.A.C.A. tank. This note give the results obtained in tests of one-quarter full-size models of two floats for high-speed seaplanes. One was a float similar to that used on the Macchi high-speed seaplane which competed in the 1926 Schneider Trophy races, and the other a float designed at the N.A.C.A. tank in an attempt to improve on the water performance of the Macchi float. The model of the latter showed considerably better water performance than the model of the Macchi float.
Contributing Partner: UNT Libraries Government Documents Department
Tank tests of two models of flying-boat hulls to determine the effect of ventilating the step

Tank tests of two models of flying-boat hulls to determine the effect of ventilating the step

Date: February 1, 1937
Creator: Dawson, John R
Description: The results of tests made in the N.A.C.A. tank on two models of flying-boat hulls to determine the effect of ventilating the step are given graphically. The step of N.A.C.A. model 11-C was ventilated in several different ways and it was found that the resistance of the normal form is not appreciably affected by artificial ventilation in any of the forms tried. Further tests made with the depth of the step of model 11-C reduced likewise show no appreciable effect on the resistance from ventilation of the step. Tests were made on a model of the hull of the Navy P3M-1 flying-boat hull both with and without ventilation of the step. It was found that the discontinuity which is obtained in the resistance curves of this model is eliminated by ventilating the step.
Contributing Partner: UNT Libraries Government Documents Department
Tank tests on the resistance and porpoising characteristics of three flying-boat hull models equipped with planing flaps

Tank tests on the resistance and porpoising characteristics of three flying-boat hull models equipped with planing flaps

Date: November 1, 1944
Creator: Barklie, Jean A
Description: None
Contributing Partner: UNT Libraries Government Documents Department
Tank tests to determine the effect of varying design parameters of planing-tail hulls I : effect of varying length, width, and plan-form taper of afterbody

Tank tests to determine the effect of varying design parameters of planing-tail hulls I : effect of varying length, width, and plan-form taper of afterbody

Date: May 1, 1946
Creator: Dawson, John R; Walter, Robert C & Hay, Elizabeth S
Description: None
Contributing Partner: UNT Libraries Government Documents Department
Tank tests to determine the effect of varying design parameters of planing-tail hulls II : effect of varying depth of step, angle of after- body keel, length of afterbody chine, and gross load

Tank tests to determine the effect of varying design parameters of planing-tail hulls II : effect of varying depth of step, angle of after- body keel, length of afterbody chine, and gross load

Date: July 1, 1946
Creator: Dawson, John R; Mckann, Robert & Hay, Elizabeth S
Description: The second part of a series of tests made in Langley tank no. 2 to determine the effect of varying design parameters of planing-tail hulls is presented. Results are given to show the effects on resistance characteristics of varying angle of afterbody keel, depth of step, and length of afterbody chine. The effect of varying the gross load is shown for one configuration. The resistance characteristics of planing-tail hulls are compared with those of a conventional flying-boat hull. The forces on the forebody and afterbody of one configuration are compared with the forces on a conventional hull. Increasing the angle of afterbody keel had small effect on hump resistance and no effect on high-speed resistance but increased free-to-trim resistance at intermediate speeds. Increasing the depth of step increased hump resistance, had little effect on high-speed resistance, and increased free-to-trim resistance at intermediate speeds. Omitting the chines on the forward 25 percent of the afterbody had no appreciable effect on resistance. Omitting 70 percent of the chine length had almost no effect on maximum resistance but broadened the hump and increased spray around the afterbody. Load-resistance ratio at the hump decreased more rapidly with increasing load coefficient for the planing-tail hull ...
Contributing Partner: UNT Libraries Government Documents Department
Tank tests to determine the effect on planing-tail hulls of varying length, width, and plan-form taper of afterbody

Tank tests to determine the effect on planing-tail hulls of varying length, width, and plan-form taper of afterbody

Date: January 1, 1946
Creator: Dawson, John R; Walter, Robert C & Hay, Elizabeth S
Description: Tests were conducted in Langley Tank no. 2 on models of an unconventional flying-boat hull called a planing-tail hull to determine the effects on resistance of varying a number of afterbody parameters. The effects of varying length, width, and plan-form taper of the afterbody are presented. Tests were made with afterbodies of two widths, two lengths, and two tapers. In the tests the depth of step and the angle of afterbody keel were held constant.(author).
Contributing Partner: UNT Libraries Government Documents Department
Tank tests to determine the effects of the chine flare of a flying-boat hull N.A.C.A. Model Series 62 and 69

Tank tests to determine the effects of the chine flare of a flying-boat hull N.A.C.A. Model Series 62 and 69

Date: August 1, 1939
Creator: Bell, Joe W & Olson, Roland E
Description: None
Contributing Partner: UNT Libraries Government Documents Department
Tank Tests to Show the Effect Rivet Heads on the Water Performance of a Seaplane-Float

Tank Tests to Show the Effect Rivet Heads on the Water Performance of a Seaplane-Float

Date: July 1, 1938
Creator: Parkinson, J B
Description: A 1/3.5 full-sized model of a seaplane float constructed from lines supplied by the Bureau of Aeronautics, Navy Department, was tested first with smooth painted bottom surfaces and then with round-head rivets, plate laps, and keel plates fitted to simulate the actual bottom of a metal float. A percentage increase in water resistance caused by the added roughness was found to be from 5 to 20 percent at the hump speed and from 15 to 40 percent at high speeds. The effect of the roughness of the afterbody was found to be negligible except at high trims. The model data were extrapolated to full size by the usual method that assumes the forces to vary according to Froude's law and, in the case of the smooth model, by a method of separation that takes into account the effect of scale on the frictional resistance. It was concluded that the effect of rivet heads on the take-off performance of a relatively high-powered float seaplane is of little consequence, but it may be of greater importance in the case of more moderately powered flying boats.
Contributing Partner: UNT Libraries Government Documents Department
Tanks test of a model of the hull of the Navy PB-1 flying boat - N.A.C.A. Model 52

Tanks test of a model of the hull of the Navy PB-1 flying boat - N.A.C.A. Model 52

Date: August 1, 1936
Creator: Allison, John M
Description: A model of the hull of the Navy PB-1 flying boat was tested in the N.A.C.A. tank as part of a program intended to provide information regarding the water performance of hulls of flying boats of earlier design for which hydrodynamic data have heretofore been unavailable. Tests were made according to the general method over the range of practical loadings with the model both fixed in trim and free to trim. A free-to-trim test according to the specific method was also made for the design load and take-off speed corresponding to those of the full-scale flying boat. The resistance obtained from the fixed-trim test was found to be about the same as that of the model of the NC flying-boat hull, and greater at the hump but smaller at high speeds than that of a model of the Sikorsky S-40 flying-boat hull.
Contributing Partner: UNT Libraries Government Documents Department