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Hydrodynamic and Aerodynamic Tests of Four Models of Outboard Floats: (N.A.C.A. Models 51-A, 51-B, 51-C, and 51-D)

Description: Four models of outboard floats (N.A.C.A. models 51-A, 51-B, 51-C, and 51-D) were tested in the N.A.C.A. tank to determine their hydrodynamic characteristics and in the 20-foot wind tunnel to determine their aerodynamic drag. The results of the tests, together with comparisons of them, are presented in the form of charts. From the comparisons, the order of merit of the models is estimated for each factor considered. The best compromise between the various factors seems to be given by model 51-D. This model is the only one in the series with a transverse step.
Date: December 1938
Creator: Dawson, John R. & Hartman, Edwin P.
Partner: UNT Libraries Government Documents Department
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Tank Tests of Two Floats for High-Speed Seaplanes

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" (p. 1).
Date: November 1933
Creator: Bell, Joe W.
Partner: UNT Libraries Government Documents Department
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The Impact on Seaplane Floats During Landing

Description: "In order to make a stress analysis of seaplane floats, and especially of the members connecting the floats with the fuselage, it is of great importance to determine the maximum pressure acting on the floats during landing. Here, the author gives a formula for maximum pressures during landing that permits one to apply experimental results to different bodies and different velocities. The author notes that the formula checks very well with experimental results" (p. 1).
Date: October 1929
Creator: von Karman, T.
Partner: UNT Libraries Government Documents Department

[MC staff members making floats]

Description: A photograph of Lanette McClure and Andrea Robledo making ice cream floats in the UNT Multicultural Center offices. They both have on UNT Multicultural Center t-shirts and have large ice cream tubs and several bottles of Coca-cola and Barg's Rootbeer in front of them. There are paper handouts on the counter in front of them and students are visible sitting in the room past them.
Date: August 23, 2006
Creator: University of North Texas. Multicultural Center.
Partner: UNT Libraries Special Collections
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On Floats and Float Tests

Description: The principal source of information on float resistance is the model test. In view of the insuperable difficulties opposing any attempt at theoretical treatment of the resistance problem, particularly at attitudes which tend toward satisfactory take-off, such as the transitory stage to planing, the towing test is and will remain the primary method for some time.
Date: September 1931
Creator: Seewald, Friedrich
Partner: UNT Libraries Government Documents Department
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Hydrodynamic and aerodynamic tests of a family of models of seaplane floats with varying angles of dead rise: N.A.C.A. Models 57-A, 57-B, and 57-C

Description: Three models of V-bottom floats for twin-float seaplanes (N.A.C.A. models 57-A, 57-B, and 57-C) having angles of dead rise of 20 degrees, 25 degrees, and thirty degrees, respectively, were tested in the N.A.C.A. tank and in the N.A.C.A. 7- by 10-foot wind tunnel. Within the range investigated, the effect of angle of dead rise on water resistance was found to be negligible at speeds up to and including the hump speed, and water resistance was found to increase with angle of dead rise at planing speeds. The height of the spray at the hump speed decreased with increase in angle of dead rise and the aerodynamic drag increased with dead rise. Lengthening the forebody of model 57-B decreased the water resistance and the spray at speeds below the hump speed. Spray strips provided an effective means for the control of spray with the straight V sections used in the series but considerably increased the aerodynamic drag. Charts for the determination of the water resistance and the static properties of the model with 25 degrees dead rise and for the aerodynamic drag of all the models are included for use in design.
Date: July 1939
Creator: Parkinson, John B.; Olson, Roland E. & House, Rufus O.
Partner: UNT Libraries Government Documents Department
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The Aerodynamic Drag of Five Models of Side Floats N.A.C.A. Models 51-E, 51-F, 51-G, 51-H, 51-J

Description: "The drag of five models of side floats was measured in the N.A.C.A. 7- by 10-foot wind tunnel. The most promising method of reducing the drag of floats indicated by these tests is lowering the angle at which the floats are rigged. The addition of a step to a float does not always increase the drag in the flying range, floats with steps sometimes having lower drag than similar floats without steps" (p. 1).
Date: December 1938
Creator: House, R. O.
Partner: UNT Libraries Government Documents Department
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The Development of Floats and Equipment for Research in Promoting It

Description: Providing information that will make possible a favorable compromise between landing impact and planing resistance is the immediate problem in experimental float development. A description of equipment to perform dropping tests are included as well as how to determine the landing impact.
Date: March 1934
Creator: Pabst, Wilhelm
Partner: UNT Libraries Government Documents Department
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Hydrodynamic Tests of Models of Seaplane Floats

Description: "This report contains the results of tank tests carried out at free trim on seventeen hulls and floats of various types. The data as to the weight on water, trim, and relative resistance for each model are plotted nondimensionally and are referenced both to the total weight and to the weight on water. Despite the fact that the experiments were not made systematically, a study of the models and of the test data permits nevertheless some general deductions regarding the forms of floats and their resistance" (p. 1).
Date: May 1935
Creator: Eula, Antonio
Partner: UNT Libraries Government Documents Department
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The design of floats

Description: Following a summary of the multiplicity of domestic and foreign floats and a brief enumeration of the requirements of floats, the essential form parameters and their effect on the qualities of floats are detailed. On this basis a standard float design is developed which in model families with varying length/beam ratio and angle of dead rise is analyzed by an experimental method which permits its best utilization on any airplane.
Date: April 1938
Creator: Sottorf, W.
Partner: UNT Libraries Government Documents Department
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Strength Tests on Hulls and Floats

Description: "The present report deals with strength tests on hulls and floats intended in part for the collection of construction data for the design of these components and in part for the stress analysis of the finished hulls and floats" (p. 1).
Date: June 1942
Creator: Matthaes, K.
Partner: UNT Libraries Government Documents Department

[Students with coke floats]

Description: A photograph of two young women seated together in the UNT Multicultural Center offices. They both have small styrofoam cups with Coca-cola and ice cream floats in them. There is a small table with a 'Mexican'-style blanket over it and a flower arrangement on it.
Date: August 23, 2006
Creator: University of North Texas. Multicultural Center.
Partner: UNT Libraries Special Collections
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The Aerodynamic Tests of Three Edo Floats for the SB2U-3, 0S2U-2, and XSB2C-2 Seaplanes - NACA Models 106-K, 107-K, and 125-AH

Description: Report presenting aerodynamic testing of scale models of the Edo seaplane floats for the SB2U-3, OS2U-2, and XSB2C-2 seaplanes. Various coefficients, pitching moment, yawing moment, and drag coefficients are provided.
Date: March 1942
Creator: Liddell, Robert B.
Partner: UNT Libraries Government Documents Department
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Wind-tunnel tests of four full-scale seaplane floats

Description: Report presenting wind tunnel testing of four full-scale seaplane floats to determine the aerodynamic characteristics of the floats and to evaluate several drag-reducing refinements. Four floats were investigated; two differed only in external details like flush rivets, while one was the type used on twin-float installations. The variation of lift, drag, and pitching moment with pitch angle are presented for each float.
Date: July 1943
Creator: Conway, Robert N. & Maynard, Julian D.
Partner: UNT Libraries Government Documents Department
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Tank Tests to Show the Effect Rivet Heads on the Water Performance of a Seaplane-Float

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" (p. 1).
Date: July 1938
Creator: Parkinson, J. B.
Partner: UNT Libraries Government Documents Department
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Hydrodynamic and Aerodynamic Tests of a Family of Models of Seaplane Floats With Varying Angles of Dead Rise: N.A.C.A. Models 57-A, 57-B, and 57-C

Description: Report presenting testing of three models of V-bottom floats for twin-float seaplanes with varying angles of dead rise were tested in a tank and a wind tunnel. Results regarding the effect of angle of dead rise, height and amount of spray at hump speed, aerodynamic drag, effect of cross-sectional shape and load coefficients, and spray strips are provided.
Date: July 1939
Creator: Parkinson, John B.; Olson, Roland E. & House, Rufus O.
Partner: UNT Libraries Government Documents Department
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Hydrodynamic Impact Loads in Smooth Water for a Prismatic Float Having an Angle of Dead Rise of 10 Degrees

Description: Note presenting a prismatic float with an angle of dead rise of 10 degrees, which was subjected to smooth-water impacts in the impact basin. The investigation consisted of a series of impacts at fixed angles of trim of 3 degrees, 12 degrees, 20 degrees, and 30 degrees and at flight-path angles from 2 to 23 degrees. Results regarding the effect of dead-rise function and aspect-ratio factor on hydrodynamic load and chine immersion are provided.
Date: January 1956
Creator: Edge, Philip M., Jr.
Partner: UNT Libraries Government Documents Department
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The NACA Impact Basin and Water Landing Tests of a Float Model at Various Velocities and Weights

Description: "The first data obtained in the United States under the controlled testing conditions necessary for establishing relationships among the numerous parameters involved when a float having both horizontal and vertical velocity contacts a water surface are presented. The data were obtained at the NACA impact basin. The report is confined to a presentation of the relationship between resultant velocity and impact normal acceleration for various float weights when all other parameters are constant" (p. 411).
Date: 1944
Creator: Batterson, Sidney A.
Partner: UNT Libraries Government Documents Department
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The NACA Impact Basin and Water Landing Tests of a Float Model at Various Velocities and Weights

Description: Report presenting data obtained when a float with both horizontal and vertical velocity contact on a water surface. The report is confined to a presentation of the relationship between resultant velocity and impact normal acceleration for various float weights when all other parameters are constant.
Date: August 1944
Creator: Batterson, Sidney A.
Partner: UNT Libraries Government Documents Department
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The Impact on Floats or Hulls During Landing as Affected by Bottom Width

Description: For floats and hulls having V bottoms the impact force does not necessarily increase with increasing width. Therefore, the weight of the float landing gear, side walls, and other parts, and of the fuselage construction need not be increased with increasing bottom width, but the weight of the bottom construction itself, on the other hand, does not increase with increase in bottom width and is largely determined by the type of construction.
Date: November 1936
Creator: Mewes, E.
Partner: UNT Libraries Government Documents Department
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Intermediate Depth Circulation in the Gulf of Mexico: PALACE Float Results for the Gulf of Mexico Between April 1998 and March 2002

Description: This is a report of the first ever study of the intermediate depth circulation in the Gulf of Mexico made using free-drifting floats. This study also reports the first ever study of the intermediate depth thermal structure of the Gulf made by profiling floats.
Date: March 2004
Creator: United States. Department of the Interior. Minerals Management Service. Gulf of Mexico OCS Region.
Partner: UNT Libraries Government Documents Department
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