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  Partner: UNT Libraries Government Documents Department
 Collection: Technical Report Archive and Image Library
Determination of lateral-stability derivatives and transfer-function coefficients from frequency-response data for lateral motions

Determination of lateral-stability derivatives and transfer-function coefficients from frequency-response data for lateral motions

Date: January 1, 1955
Creator: Donegan, James J; Robinson, Samuel W , Jr & Gates, Ordway, B , jr
Description: A method is presented for determining the lateral-stability derivatives, transfer-function coefficients, and the modes for lateral motion from frequency-response data for a rigid aircraft. The method is based on the application of the vector technique to the equations of lateral motion, so that the three equations of lateral motion can be separated into six equations. The method of least squares is then applied to the data for each of these equations to yield the coefficients of the equations of lateral motion from which the lateral-stability derivatives and lateral transfer-function coefficients are computed. Two numerical examples are given to demonstrate the use of the method.
Contributing Partner: UNT Libraries Government Documents Department
Determination of longitudinal stability in supersonic accelerated maneuvers for the Douglas D-558-II research airplane

Determination of longitudinal stability in supersonic accelerated maneuvers for the Douglas D-558-II research airplane

Date: February 17, 1954
Creator: Ankenbruck, Herman O
Description: None
Contributing Partner: UNT Libraries Government Documents Department
Determination of lateral-stability derivatives and transfer-function coefficients from frequency-response data for lateral motions

Determination of lateral-stability derivatives and transfer-function coefficients from frequency-response data for lateral motions

Date: May 1, 1954
Creator: Donegan, James J; Robinson, Samuel W , Jr & Gates, Ordway B , Jr
Description: None
Contributing Partner: UNT Libraries Government Documents Department
The design of fins for air-cooled cylinders

The design of fins for air-cooled cylinders

Date: January 1, 1941
Creator: Biermann, Arnold E & Ellerbrock, Herman H , Jr
Description: An analysis was made to determine the proportions of fins made of aluminum, copper, magnesium, and steel necessary to dissipate maximum quantities of heat for different fin widths, fin weights, and air-flow conditions. The analysis also concerns the determination of the optimum fin proportions when specified limits are placed on the fin dimensions. The calculation of the heat flow in the fins is based on experimentally verified, theoretical equations. The surface heat-transfer coefficients used with this equation were taken from previously reported experiments. In addition to the presentation of fin-design information, this investigation shows that optimum fin dimensions are inappreciably affected by the differences in air flow that are obtained with different air-flow arrangements or by small changes in the length of the air-flow path.
Contributing Partner: UNT Libraries Government Documents Department
Design of NACA cowlings for radial air-cooled engines

Design of NACA cowlings for radial air-cooled engines

Date: January 1, 1939
Creator: Stickle, George W
Description: The information on the propeller-cowling-nacelle combinations, presented in Technical Reports nos. 592, 593, and 596 and in Technical Note 620, is applied to the practical design of NACA cowlings. The main emphasis is placed on the method of obtaining the dimensions of the cowling; consequently, the physical functioning of each part of the cowling is treated very briefly. A practical method of designing cowlings and some examples are presented.
Contributing Partner: UNT Libraries Government Documents Department
Design of power-plant installations pressure-loss characteristics of duct components

Design of power-plant installations pressure-loss characteristics of duct components

Date: June 1, 1944
Creator: Henry, John R
Description: A correlation of what are believed to be the most reliable data available on duct components of aircraft power-plant installations is presented. The information is given in a convenient form and is offered as an aid in designing duct systems and, subject to certain qualifications, as a guide in estimating their performance. The design and performance data include those for straight ducts; simple bends of square, circular, and elliptical cross sections; compound bends; diverging and converging bends; vaned bends; diffusers; branch ducts; internal inlets; and an angular placement of heat exchangers. Examples are included to illustrate methods of applying these data in analyzing duct systems. (author).
Contributing Partner: UNT Libraries Government Documents Department
Design of recording wind tunnel balances

Design of recording wind tunnel balances

Date: December 1, 1920
Creator: Norton, F H
Description: Given here is a description of the design of a scientific recording wind tunnel balance. It was decided that the most satisfactory arrangement would be a rigid ring completely surrounding the tunnel or wind stream, so that the model could be supported from it by wires or any arrangement of spindles. The forces and moments acting on this ring can then be recorded by suitable weighing apparatus. The methods available for recording forces on the arms are explained. The proposed type of balance will support the model rigidly in a variety of ways, will make a complete test without attention, and will plot the results so that all computations are avoided.
Contributing Partner: UNT Libraries Government Documents Department
The design of cooling ducts with special reference to the boundary layer at the inlet

The design of cooling ducts with special reference to the boundary layer at the inlet

Date: December 1, 1940
Creator: Katzoff, S
Description: None
Contributing Partner: UNT Libraries Government Documents Department
The design of the optimum hull for a large long-range flying boat

The design of the optimum hull for a large long-range flying boat

Date: September 1, 1944
Creator: Parkinson, John B
Description: None
Contributing Partner: UNT Libraries Government Documents Department
Design of Wind Tunnels and Wind Tunnel Propellers, II

Design of Wind Tunnels and Wind Tunnel Propellers, II

Date: January 1, 1921
Creator: Norton, F. H. & Warner, E. P.
Description: No abstract available.
Contributing Partner: UNT Libraries Government Documents Department