Analysis of parameters for thrust control of a turbojet engine equipped with air-inlet throttle and variable-area exhaust nozzle (open access)

Analysis of parameters for thrust control of a turbojet engine equipped with air-inlet throttle and variable-area exhaust nozzle

From Introduction: "In this report, altitude, airplane velocity, exhaust-nozzle area, and turbine-inlet temperature were chosen and corresponding engine speed, fuel flow, and throttle pressure ratio were found. A detailed discussion of the engine analysis and the calculations used are presented in Appendix A. The derivations of the principal equations used are presented in appendix B."
Date: August 10, 1948
Creator: Boksenbom, Aaron S. & Feder, Melvin S.
System: The UNT Digital Library
Formulas for the Elastic Constants of Plates With Integral Waffle-Like Stiffening (open access)

Formulas for the Elastic Constants of Plates With Integral Waffle-Like Stiffening

Report presenting formulas for fifteen elastic constants associated with bending, stretching, twisting, and shearing of plates with closely spaced integral ribbing in a variety of configurations and proportions. Four coefficients are provided for each rib and the experimental means of determining them are described.
Date: August 10, 1953
Creator: Dow, Norris F.; Libove, Charles & Hubka, Ralph E.
System: The UNT Digital Library
Longitudinal Flight Characteristics of the Bell X-5 Research Airplane at 59 Degree Sweepback With Modified Wing Roots (open access)

Longitudinal Flight Characteristics of the Bell X-5 Research Airplane at 59 Degree Sweepback With Modified Wing Roots

"In an attempt to improve the longitudinal stability characteristics of the Bell X-5 research airplane at 59 degrees sweepback, the wing-root leading edge was modified by replacing the original 52.5 degrees sweptback leading-edge fillets with rounded leading-edge fillets. The data obtained show that the longitudinal stability characteristics, as well as the buffet and drag characteristics, were unaffected by the modification" (p. 1).
Date: August 10, 1953
Creator: Martin, James A.
System: The UNT Digital Library
Free-Flight Longitudinal-Stability Investigation Including Some Effects of Wing Elasticity From Mach Numbers of 0.85 to 1.34 of a Tailless Missile Configuration Having a 45 Degree Sweptback Wing of Aspect Ratio 5.5 (open access)

Free-Flight Longitudinal-Stability Investigation Including Some Effects of Wing Elasticity From Mach Numbers of 0.85 to 1.34 of a Tailless Missile Configuration Having a 45 Degree Sweptback Wing of Aspect Ratio 5.5

Report presenting a free-flight longitudinal-stability investigation between Mach numbers of 0.85 and 1.34 to obtain the aerodynamic characteristics of a long-range, jet-propelled, ground-to-ground missile with a wing of aspect ratio 5.5, 45 degrees of sweepback, and taper ratio 0.4 on a body with a vertical tail. Two models with two different wing materials were flown. Results regarding trimmed flight, pitching flight, and aeroelastic calculations are provided.
Date: August 10, 1953
Creator: Arbic, Richard G. & Gillespie, Warren, Jr.
System: The UNT Digital Library
The appearance of a boric oxide exhaust cloud from a turbojet engine operating on trimethylborate fuel (open access)

The appearance of a boric oxide exhaust cloud from a turbojet engine operating on trimethylborate fuel

From Summary: "Data are included on the amount of fallout from the cloud and the concentration of boric oxide in the cloud."
Date: August 10, 1956
Creator: Lord, Albert M. & Kaufman, Warner B.
System: The UNT Digital Library
General equations for the stress analysis of rings (open access)

General equations for the stress analysis of rings

In this report it is shown that the shear, axial force, and moment at one point in a simple ring subjected to any loading condition can be given by three independent equations involving certain integrals that must be evaluated regardless of the method of analysis used. It is also shown how symmetry of the ring alone or of the ring and the loading about 1 or 2 axes makes it possible to simplify the three equations and greatly reduces the number of integrals that must be evaluated. Application of the general equations presented in this report to practical problems in the stress analysis of rings makes it possible to shorten, simplify, and systematize the calculations for both simple and braced rings. Three illustrative problems are included to demonstrate the application of the general equations to a simple ring with different loadings.
Date: August 10, 1934
Creator: Lundquist, Eugene E. & Burke, Walter F.
System: The UNT Digital Library
Preliminary Results of an Altitude-Wind-Tunnel Investigation of an Axial-Flow Gas Turbine-Propeller Engine 4 - Compressor and Turbine Performance Characteristics (open access)

Preliminary Results of an Altitude-Wind-Tunnel Investigation of an Axial-Flow Gas Turbine-Propeller Engine 4 - Compressor and Turbine Performance Characteristics

"As part of an investigation of the performance and operational characteristics of the axial-flow gas turbine-propeller engine, conducted in the Cleveland altitude wind tunnel, the performance characteristics of the compressor and the turbine were obtained. The data presented were obtained at a compressor-inlet ram-pressure ratio of 1.00 for altitudes from 5000 to 35,000 feet, engine speeds from 8000 to 13,000 rpm, and turbine-inlet temperatures from 1400 to 2100 R. The highest compressor pressure ratio obtained was 6.15 at a corrected air flow of 23.7 pounds per second and a corrected turbine-inlet temperature of 2475 degrees R" (p. 1).
Date: August 10, 1948
Creator: Wallner, Lewis E. & Saari, Martin J.
System: The UNT Digital Library
Additional Results on the Static Longitudinal and Lateral Stability Characteristics of a 0.05-Scale Model of the Convair F2Y-1 Airplane at High Subsonic Speeds (open access)

Additional Results on the Static Longitudinal and Lateral Stability Characteristics of a 0.05-Scale Model of the Convair F2Y-1 Airplane at High Subsonic Speeds

"Additional results on the static longitudinal and lateral stability characteristics of a 0.05-scale model of the Convair F2Y-1 water-based fighter airplane were obtained in the Langley high-speed 7- by 10-foot tunnel over a Mach number range of 0.50 to 0.92. The maximum angle-of-attack range (obtained at the lower Mach numbers) was from -2 degrees to 25 degrees. The sideslip-angle range investigated was from -4 degrees to 12 degrees" (p. 1).
Date: August 10, 1954
Creator: Spreeman, Kenneth P. & Few, Albert G., Jr.
System: The UNT Digital Library
Pressure Measurements on a Sharply Converging Fuselage Afterbody With Jet on and Off at Mach Numbers From 0.8 to 1.6 (open access)

Pressure Measurements on a Sharply Converging Fuselage Afterbody With Jet on and Off at Mach Numbers From 0.8 to 1.6

Report presenting testing of a rocket-powered model of a fin-stabilized parabolic body of revolution with fineness ratio 8.91 and maximum diameter at 80 percent of body station at a range of Mach numbers to determine the static pressures at two orifices on the rearward side of the stabilizing fins. Results regarding measured pressures, comparison of theory and experiment, and drag are provided.
Date: August 10, 1950
Creator: Stoney, William E., Jr. & Katz, Ellis
System: The UNT Digital Library
Investigation at High Subsonic Speeds of Methods of Alleviating the Adverse Interference at the Root of a Swept-Back Wing (open access)

Investigation at High Subsonic Speeds of Methods of Alleviating the Adverse Interference at the Root of a Swept-Back Wing

Memorandum presenting an investigation of the interference at the root of a sweptback wing at high subsonic Mach numbers by means of wind-tunnel measurements of a wing-body combination with the 50-percent-chord line of the wing either unswept or swept back 35 degrees. Results regarding body characteristics, pressure studies, tuft studies, and force studies are provided.
Date: August 10, 1950
Creator: Boddy, Lee E.
System: The UNT Digital Library
Analysis of the dynamic lateral stability characteristics of the Bell X-2 airplane as affected by variations in mass, aerodynamic, and dimensional parameters (open access)

Analysis of the dynamic lateral stability characteristics of the Bell X-2 airplane as affected by variations in mass, aerodynamic, and dimensional parameters

Report presenting an analysis of the dynamic-lateral-stability characteristics of the Bell X-2 airplane as affected by variations in mass, aerodynamic, and dimensional parameters by means of calculations of the period and rate of damping of the lateral oscillation. Results regarding the airplane with flaps and gear retracted, airplane with flaps and gear lowered, and effects of assumed modifications to the airplane are provided.
Date: August 10, 1949
Creator: Michael, W. H., Jr. & Queijo, M. J.
System: The UNT Digital Library
The Appearance of a Boric Oxide Exhaust Cloud From a Turbojet Engine Operating on Trimethylborate Fuel (open access)

The Appearance of a Boric Oxide Exhaust Cloud From a Turbojet Engine Operating on Trimethylborate Fuel

Memorandum presenting an investigation conducted on the size and density of the boric oxide exhaust cloud from a J47-25 turbojet engine operating on trimethyl-borate fuel at sea-level static conditions. Movies and still photographs were taken from the ground and from a helicopter. Results regarding the visual observation and oxide fallout and concentration are provided.
Date: August 10, 1956
Creator: Lord, Albert M. & Kaufman, Warner B.
System: The UNT Digital Library