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  Partner: UNT Libraries Government Documents Department
 Decade: 1930-1939
 Serial/Series Title: NACA Technical Notes
 Collection: Technical Report Archive and Image Library
Alterations and tests of the "Farnboro" engine indicator

Alterations and tests of the "Farnboro" engine indicator

Date: September 1, 1930
Creator: Collins, John H , Jr
Description: The 'Farnboro' electric indicator was tested as received from the manufacturers, and modifications made to the instrument to improve its operation. The original design of disk valve was altered so as to reduce the mass, travel, and seat area. Changes were made to the recording mechanism, which included a new method of locating the top center position on the record. The effect of friction on the motion of the pointer while taking motoring and power cards was eliminated by providing a means of putting pressure lines on the record. The modified indicator gives a complete record of the average cyclic variation in pressure per crank degree for any set of engine operating conditions which can be held constant for the period of time required to build up the composite card. The value of the record for accurate quantitative measurement is still questioned, although the maximum indicated pressure recorded on the motoring and power cards checks the readings of the balanced diaphragm type of maximum cylinder pressure indicator.
Contributing Partner: UNT Libraries Government Documents Department
Analysis and model tests of autogiro jump take-off

Analysis and model tests of autogiro jump take-off

Date: October 1, 1936
Creator: Wheatley, John B
Description: An analysis is made of the autogiro jump take-off, in which the kinetic energy of the rotor turning at excess speed is used to effect a vertical take-off. By the use of suitable approximations, the differential equation of motion of the rotor during this maneuver is reduced to a form that can be solved. Only the vertical jump was studied; the effect of a forward motion during the jump is discussed briefly. The results of model tests of the jump take-off have been incorporated in the paper and used to establish the relative accuracy of the results predicted from the analysis. Good agreement between calculation and experiment was obtained by making justifiable allowances.
Contributing Partner: UNT Libraries Government Documents Department
Analysis of a strut with a single elastic support in the span, with applications to the design of airplane jury-strut systems

Analysis of a strut with a single elastic support in the span, with applications to the design of airplane jury-strut systems

Date: May 1, 1935
Creator: Schwartz, A Murray
Description: None
Contributing Partner: UNT Libraries Government Documents Department
Analytical determination of the load on a trailing edge flap

Analytical determination of the load on a trailing edge flap

Date: October 1, 1930
Creator: Pinkerton, Robert M
Description: This report presents a theoretical analysis of the lift on a trailing edge flap. An analytical expression has been derived which enables the computation of the flap load coefficient. The theoretical results seem to show a fair agreement with the meager experimental results which are available.
Contributing Partner: UNT Libraries Government Documents Department
An Application of the Von Karman-millikan Laminar Boundary-layer Theory and Comparison With Experiment

An Application of the Von Karman-millikan Laminar Boundary-layer Theory and Comparison With Experiment

Date: October 1, 1935
Creator: Doenhoff, A. E. V.
Description: None
Contributing Partner: UNT Libraries Government Documents Department
An application of the von Karman-Millikan laminar boundary-layer theory and comparison with experiment

An application of the von Karman-Millikan laminar boundary-layer theory and comparison with experiment

Date: October 1, 1935
Creator: Von Doenhoff, Albert E
Description: The von Karman-Millikan theory of laminar boundary layers presented in NACA Technical Report No. 504 is applied to the laminar boundary layer about an elliptic cylinder on which boundary-layer and pressure-distribution measurements were made. An outline of the procedure of the von Karman-Millikan method is given. Good agreement is obtained between the calculated and experimental results, indicating that the method may be applied generally to the laminar boundary layer about any body provided that an experimentally determined pressure distribution is available. It appears that for all Reynolds Number above 24,000 the separation point for the elliptic cylinder should occur at a constant distance behind the point of minimum pressure, provided that the boundary layer does not become turbulent.
Contributing Partner: UNT Libraries Government Documents Department
An approximate spin design criterion for monoplanes

An approximate spin design criterion for monoplanes

Date: June 1, 1939
Creator: Donlan, Charles J & Seidman, Oscar
Description: A quantitative criterion of merit has been needed to assist airplane designers to incorporate satisfactory spinning characteristics into new designs. An approximate empirical criterion, based on the projected side area and the mass distribution of the airplane, has been formulated in a recent British report. In the present paper, the British results have been analyzed and applied to American designs. A simpler design criterion based solely on the type and the dimensions of the tail, has been developed: it is useful in a rapid estimation of whether a new design is likely to comply with the minimum requirements for safety in spinning.
Contributing Partner: UNT Libraries Government Documents Department
A balanced diaphragm type of maximum cylinder pressure indicator

A balanced diaphragm type of maximum cylinder pressure indicator

Date: December 1, 1930
Creator: Spanogle, J A
Description: A balanced diaphragm type of maximum cylinder pressure indicator was designed to give results consistent with engine operating conditions. The apparatus consists of a pressure element, a source of controlled high pressure and a neon lamp circuit. The pressure element, which is very compact, permits location of the diaphragm within 1/8 inch of the combustion chamber walls without water cooling. The neon lamp circuit used for indicating contact between the diaphragm and support facilitates the use of the apparatus with multicylinder engines.
Contributing Partner: UNT Libraries Government Documents Department
Basic requirements of fuel-injection nozzles for quiescent combustion chambers

Basic requirements of fuel-injection nozzles for quiescent combustion chambers

Date: June 1, 1931
Creator: Spanogle, J A
Description: This report presents test results obtained during an investigation of the performance of a single-cylinder, high-speed, compression-ignition test engine when using multiple-orifice fuel-injection valve nozzles in which the number and the direction of the orifices were varied independently.
Contributing Partner: UNT Libraries Government Documents Department
The behavior of conventional airplanes in situations thought to lead to most crashes

The behavior of conventional airplanes in situations thought to lead to most crashes

Date: February 1, 1931
Creator: Weick, Fred E
Description: Simple flight tests were made on ten conventional airplanes for the purpose of determining their action in the following two situations, which are generally thought to precede and lead to a large proportion of airplane crashes.
Contributing Partner: UNT Libraries Government Documents Department