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The Aerodynamic Effect of a Retractable Landing Gear

Description: "Tests were conducted in the N.A.C.A. full scale wind tunnel at the request of the Army Air Corps to determine the effect of retractable landing gear openings in the bottom surface of a wing upon the characteristics of a Lockheed Altair airplane. The tests were extended to include the determination of the lift and drag characteristics throughout the angle-of-attack range with the landing gear both retracted and extended. Covering the wheel openings in the wing with sheet metal when the wheels w… more
Date: March 1933
Creator: DeFrance, Smith J.
Partner: UNT Libraries Government Documents Department
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Comparison of Three Methods for Calculating the Compressive Strength of Flat and Slightly Curved Sheet and Stiffener Combinations

Description: "This report gives a comparison of the accuracy of the three methods for calculating the compressive strength of flat sheet and stiffener combinations such as occur in stressed-skin or monocoque structures for aircraft. Of the three methods based upon various assumptions with regard to the interaction of sheet and stiffener, the method based upon mutual action of the stiffener and an effective width as a column gave the best agreement with the results of the tests. An investigation of the effec… more
Date: March 1933
Creator: Lundquist, Eugene E.
Partner: UNT Libraries Government Documents Department
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Determination of Inherent Stresses by Measuring Deformations of Drilled Holes

Description: "Various methods have been proposed for determining the inherent stresses in structural components by disturbing their stress equilibrium through a mechanical device and measuring the resulting deformations. The methods used have disadvantages because they can be used only with specially shaped pieces (those with round or rectangular cross sections), that every form of test piece requires another kind of injury and hence of calculation, and the tested parts are rendered useless. The new test me… more
Date: March 1933
Creator: Mathar, Josef
Partner: UNT Libraries Government Documents Department
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The Effect of a Gap Between Elevator and Stabilizer on the Static Stability and Maneuverability About the Lateral Axis in Flight

Description: "A number of German airplanes have a gap between elevator and stabilizer. The effect of this open space is not generally known, although English wind-tunnel experiments have shown that even a very small gap exerts a profound influence on the elevator action. The purpose of the present free-flight measurements is to ascertain whether fairing over the gap would actually result in an appreciable improvement" (p. 1).
Date: March 1933
Creator: Hübner, Walter
Partner: UNT Libraries Government Documents Department
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Experiments With a Counter-Propeller

Description: This note describes tests made at Stanford University on a four-blade fixed counter-propeller in combination with a two-blade rotating propeller. It is shown that the efficiency of the normal form, well-designed air propeller can be increased about two percent over the full working range by the addition of fixed counter-propeller blades.
Date: March 1933
Creator: Lesley, E. P.
Partner: UNT Libraries Government Documents Department
open access

The importance of auto-ignition lag in knocking

Description: Report presenting an examination of the phenomenon of knocking, which is often accompanied by an apparently simultaneous reaction of the last part of the charge to burn. Several hypotheses regarding the burning of fuel and an exploration of current literature regarding the phenomena are provided.
Date: March 1933
Creator: Taylor, E. S.
Partner: UNT Libraries Government Documents Department
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Increasing the Volumetric Efficiency of Diesel Engines by Intake Pipes

Description: "Development of a method for calculating the volumetric efficiency of piston engines with intake pipes. Application of this method to the scavenging pumps of two-stroke-cycle engines with crankcase scavenging and to four-stroke-cycle engines. The utility of the method is demonstrated by volumetric-efficiency tests of the two-stroke-cycle engines with crankcase scavenging. Its practical application to the calculation of intake pipes is illustrated by example" (p. 1).
Date: March 1933
Creator: List, Hans
Partner: UNT Libraries Government Documents Department
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The N.A.C.A. Combustion Chamber Gas-Sampling Valve and Some Preliminary Test Results

Description: "A gas sampling valve of the inertia-operated type was designed for procuring samples of the gases in the combustion chamber of internal combustion engines at identical points in successive cycles so that the analysis of the gas samples thus procured may aid in the study of the process of combustion. The operation of the valve is described. The valve was used to investigate the CO2 content of gases taken from the quiescent combustion chamber of a high speed compression-ignition engine when oper… more
Date: March 1933
Creator: Spanogle, J. A. & Buckley, E. C.
Partner: UNT Libraries Government Documents Department
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The N.A.C.A. High-Speed Wind Tunnel and Tests of Six Propeller Sections

Description: "This report gives a description of the high-speed wind tunnel of the National Advisory Committee for Aeronautics. The operation of the tunnel is also described and the method of presenting the data is given. An account of an investigation of the aerodynamic properties of six propeller sections is included" (p. 399).
Date: March 28, 1933
Creator: Stack, John
Partner: UNT Libraries Government Documents Department
open access

Wind tunnel research comparing lateral control devices, particularly at high angles of attack 10: various control devices on a wing with a fixed auxiliary airfoil

Description: Results are given of a series of systemic tests comparing lateral control devices with particular reference to their effectiveness at high angles of attack. These tests were made with two sizes of ordinary ailerons and different sizes of spoilers on a Clark Y wing model having a narrow auxiliary airfoil fixed ahead and above the leading edge, the chords of the main and auxiliary airfoils being parallel. In addition, the auxiliary airfoil itself was given angular deflection. The purpose was to p… more
Date: March 1933
Creator: Weick, Fred E. & Noyes, Richard W.
Partner: UNT Libraries Government Documents Department
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