Serial/Series Title
Month
Day
327 Matching Results
Results open in a new window/tab.
prev
Results:
313 - 327 of
327
Tabulation of the F(Sub Lambda) Functions Which Occur in the Aerodynamic Theory of Oscillating Wings in Supersonic Flow
Note presenting an evaluation of the integrals which occur in the aerodynamic theory for wings oscillating in pure supersonic flow for various Mach numbers and values of the reduced frequency.
Date:
February 1956
Creator:
Huckel, Vera
System:
The UNT Digital Library
A method for obtaining statistical data on airplane vertical velocity at ground contact from measurements of center-of-gravity acceleration
Report presenting a method in which the contact vertical velocities of airplanes are obtained on a statistical basis from measurements of maximum incremental center-of-gravity acceleration. 268 landings with a small trainer airplane using this method have been made. Data regarding calibration curves, some results obtained during landings of a large flexible airplane, and the possibility of using only analytical methods for calibration are provided.
Date:
February 1956
Creator:
Dreher, Robert C.
System:
The UNT Digital Library
Comparison of landing-impact velocities of first and second wheel to contact from statistical measurements of transport airplane landings
Report presenting a statistical analysis of vertical velocities at second wheel to touch made from photographs of 353 landings of transport airplanes at Washington National Airport. Results regarding gusts, rolling direction, and number of engines are provided.
Date:
February 1956
Creator:
Harrin, Eziaslav N.
System:
The UNT Digital Library
Experimental Investigation of Misaligning Couples and Eccentricity at Ends of Misaligned Plain Bearings
Note presenting an experimental investigation to study the behavior of full journal bearings under steady load when acted upon by a steady misaligning couple. Displacements of the ends of the journal axis relative to the bearing axis were measured with either an axial couple applied in the plane of the central load or a twisting couple in the plane normal to the central load. Results regarding the phenomena at zero central load, misaligned attitude, Sommerfeld number and capacity number, load ratio, and couple variable are provided.
Date:
February 1955
Creator:
DuBois, G. B.; Ocvirk, F. W. & Wehe, R. L.
System:
The UNT Digital Library
Summary of 65-Series Compressor-Blade Low-Speed Cascade Data by Use of the Carpet-Plotting Technique
Carpet plots included permit the selection of the blade camber and the design angle of attack required to fulfill a design vector diagram. Other carpet plots provide means for the prediction of off-design turning angles.
Date:
February 1957
Creator:
Felix, A. Richard
System:
The UNT Digital Library
A Hot-Wire Circuit With Very Small Time Lag
A circuit for a hot-wire anemometer for the measurement of fluctuating flow is presented in the present report. The principal elements of the circuit are a Wheatstone bridge, one branch of which is the hot wire; and an electronic amplifier and a current regulator for the brief current which in combination maintain the bridge balance constant. Hence the hot wire is kept at practically constant resistance and temperature, and the time lag caused by thermal inertia of the wire is thereby reduced. Through the addition of a nonlinear amplifying stage the reading of the instrument has been rendered proportional to the velocity. A discussion of certain characteristics of the circuit and the results of related calibrating tests are given.
Date:
February 1943
Creator:
Weske, John R.
System:
The UNT Digital Library
Methods of Measurement of High Air Velocities by the Hot-Wire Method
Investigations of strengths of hot wires at high velocities were conducted with platinum, nickel, and tungsten at approximately 200 Degrees Celcius hot-wire temperature. The results appear to disqualify platinum for velocities approaching the sonic range; whereas nickel withstands sound velocity, and tungsten may be used for supersonic velocities under standard atmospheric conditions. Hot wires must be supported by rigid prolongs at high velocities to avoid wire breakage. Resting current measurements for constant temperature show agreement with King's relation.
Date:
February 1943
Creator:
Weske, John R.
System:
The UNT Digital Library
The Photoviscous Properties of Fluids
Note presenting a method that has been developed to permit the extension of the methods of photoelasticity to include the measurement of velocity distribution in a moving fluid. The method is based on the fact that viscous shear in certain liquids gives rise to double refraction, which may be linearly related to the shear stresses.
Date:
February 1942
Creator:
Weller, R.; Middlehurst, D. J. & Steiner, R.
System:
The UNT Digital Library
Aerodynamic Characteristics of Anemometer Cups
From Introduction: "The investigation was intended to cover the characteristics of individual cups and of similar cups mounted on complete cup wheals. This report treats the static tests run on the individual cups."
Date:
February 1934
Creator:
Brevoort, M. J. & Joyner, U. T.
System:
The UNT Digital Library
An airborne indicator for measuring vertical velocity of airplanes at wheel contact
From Introduction: "The purpose of this paper is to describe one of the means developed for measuring this quantity on a given airplane type- a trailing arm with wheel. A prototype velocity indicator was tested in the Langley impact basin to determine its accuracy. A description of the operation of this type of vertical-velocity indicator, the results of the impact-basin and flight tests, and general evaluation of the indicator are presented herein."
Date:
February 1953
Creator:
Dreher, Robert C.
System:
The UNT Digital Library
The aerodynamic characteristics of three tapered airfoils tested in the variable density wind tunnel
From Summary: "This report contains the lift, drag, and moment characteristics of tapered Clark Y, Gottingen 393, and USA 45 airfoils as obtained from tests made in the Variable Density Wind Tunnel of the NACA. The results are given at both low and high Reynolds Numbers to show scale effect and to provide data for use in airplane design."
Date:
February 1931
Creator:
Anderson, Raymond F.
System:
The UNT Digital Library
The Air Propeller, Its Strength and Correct Shape
It is possible to give a propeller such a shape that, under given conditions, viz., a definite speed of revolution and flying speed, the bending stresses in the blades will assume quite an insignificant magnitude.
Date:
February 1923
Creator:
Dietsius, H.
System:
The UNT Digital Library
The Strength of Semielliptical Cylinders Subjected to Combined Loadings
"The present report covers tests made on elliptical cylinders with a center support which were subjected to various simple and combined loadings. The tests yielded a series of interaction curves for combined loadings on such cylinders which should be useful in wing nose section analysis" (p. 1).
Date:
February 1945
Creator:
Sechler, E. E. & Frederick, J. L.
System:
The UNT Digital Library
Fatigue Tests on 1/8-inch Aluminum Alloy Rivets
Note presenting an investigation of the fatigue characteristics of riveted joints in aluminum alloy sheet. The purpose of this report is to summarize all the results of fatigue tests that have been made to date in the Aluminum Research Laboratories of lap joints with 1/8-inch aluminum alloy rivets.
Date:
February 1945
Creator:
Andrews, H. J. & Holt, M.
System:
The UNT Digital Library
Bearing strengths of 75S-T aluminum-alloy sheet and extruded angle
Report presenting an investigation to determine the bearing yield and ultimate strengths of 75S-T alloy in sheet form in both with- and across-grain directions and extruded angle in the longitudinal direction. Ratios of bearing to tensile properties were also determined.
Date:
February 1945
Creator:
Wescoat, C. & Moore, R. L.
System:
The UNT Digital Library