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Some Effects of Propeller Operation on the Distribution of the Load on the Vertical Tail Surface of a Typical Pursuit Airplane
Report discusses the results of testing on the pressure distribution at several longitudinal sections of the vertical tail surface of the Curtiss P-40K airplane at various angles of attack and angles of yaw and with the propeller removed and propeller operating. Results regarding the chordwise pressure distributions, effects of propeller operation on the spanwise distribution of normal-force coefficient, total normal-force coefficients, and effect of propeller operation on the variation of vertical-tail normal-force coefficients are presented.
Date:
March 1944
Creator:
Sweberg, Harold H. & Dingeldein, Richard C.
System:
The UNT Digital Library
Tests of Hydraulically Expanded Rivets
Report discusses the results of an investigation into the tightness, shear strength, tensile strength, and life under pulsating loads of hollow, hydraulically expanded rivets made of 17S-T aluminum alloy. The countersunk-head rivets with inserts had a much higher maximum load in shear than the modified-roundhead rivets, which did not have inserts.
Date:
March 1944
Creator:
Mandel, Merven W.; Crate, Harold & Schuette, Evan H.
System:
The UNT Digital Library
Maximum Lift Coefficients of Airplanes Based on Sum of Wing and Tail Areas
Report discusses the maximum lift coefficients for conventional and tailless airplanes in the gliding and landing conditions. Three areas are used to calculate the coefficients: wing area alone, wing area plus horizontal-tail area, and wing area plus horizontal- and vertical-tail areas.
Date:
March 1944
Creator:
Ankenbruck, Herman O.
System:
The UNT Digital Library
Preliminary Tank Experiments With a Hydrofoil on a Planing-Tail Seaplane Hull
Report describes exploratory testing to determine the feasibility of using a hydrofoil with a type of flying boat afterbody called a planing tail. Several hydrofoil locations were examined, including no hydrofoil, and the effects of resistance characteristics were charted. The researchers concluded that it is possible to add a single hydrofoil to that type of afterbody to provide additional hydrodynamic lift without introducing instability.
Date:
March 1944
Creator:
Wadlin, Kenneth L.
System:
The UNT Digital Library
Determination of Iron Contamination of Used Lubricating Oil for Use in Measuring Rates of Wear in Aircraft Engines
Report discusses methods of determining the iron contamination of used lubricating oil in order to study wear rates of piston rings and cylinder barrels of aircraft engines. Two methods of separating iron from used lubricating oil are presented. The results of the analyses of the oil are presented and the methods are evaluated.
Date:
March 1944
Creator:
Tischler, Adelbert O.
System:
The UNT Digital Library
The NACA Balanced-Diaphragm Dynamometer-Torque Indicator
Report describes a balanced-diaphragm device for measuring dynamometer torque of single-cylinder or multicylinder engines that was developed for laboratory use. Design variables are described, included desired torque-measuring device characteristics, diaphragm design, pilot valve, the torque-indicating instrument, the capacity range, ability of reversed operation, and double-acting operation. The accuracy is described as satisfactory and effects of other variables are negligible.
Date:
March 1944
Creator:
Moore, Charles S.; Biermann, Arnold E. & Voss, Fred
System:
The UNT Digital Library