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  Partner: UNT Libraries Government Documents Department
 Decade: 1940-1949
 Year: 1940
 Month: September
The aileron as an aid to recovery from the spin

The aileron as an aid to recovery from the spin

Date: September 1, 1940
Creator: Neihouse, A I
Description: As part of a general investigation by the NACA of factors that affect the spin, the use of the aileron as an aid to recovery from the spin was studied. Tests of 10 different models, covering a wide range of mass distribution, were made in the NACA free-spinning tunnel to determine the effects of a large downward deflection of the outboard aileron and of normal angular deflections of the ailerons upon recovery characteristics. The results indicate that the direction of aileron setting, with or against the spin, which will aid recovery from the spin depends upon the airplane weight distribution. For monoplanes and for biplanes with lower-wing ailerons, ailerons with the spin will be favorable when the weight is distributed chiefly along the fuselage (single-engine airplanes) and ailerons against the spin will be favorable when the weight is distributed chiefly along the wings (multi engine airplanes). Downward movement of the outboard aileron through a large angle will not always be effective in aiding recovery, the effectiveness of such a movement also being dependent upon the weight distribution of the airplane.
Contributing Partner: UNT Libraries Government Documents Department
Analysis of wind-tunnel data on directional stability and control

Analysis of wind-tunnel data on directional stability and control

Date: September 1, 1940
Creator: Pass, H R
Description: None
Contributing Partner: UNT Libraries Government Documents Department
Buckling tests with a spar-rib grill

Buckling tests with a spar-rib grill

Date: September 1, 1940
Creator: Weinhold, Josef
Description: The present report deals with a comparison of mathematically and experimentally defined buckling loads of a spar-rib grill, on the assumption of constant spar section, and infinitely closely spaced ribs with rigidity symmetrical to the grill center. The loads are applied as equal bending moments at both spar ends, as compression in the line connecting the joints, and in the spar center line as the assumedly uniformly distributed spar weight.
Contributing Partner: UNT Libraries Government Documents Department
A Flight Investigation of Exhaust-Heat De-Icing, Special Report

A Flight Investigation of Exhaust-Heat De-Icing, Special Report

Date: September 1, 1940
Creator: Rodert, Lewis A.
Description: The National Advisory Committee for Aeronautics has conducted exhaust-heat de-icing tests inflight t o provide data needed in the application of this method of ice prevention. Thc capacity to extract heat from the exhaust gas for de-icing purposes, the quantity of heat required, and other factors were examined. The results indicate that a wing-heating system employing a spanwise exhaust tube within the leading edge of the wing will make available for de-icing purposes between 30 and 35 percent of the exhaust-gas heat. Data are given by which the heat required for ice prevention can be calculated. Sample calculations have been made, on a basis of existing engine power over wing area ratios, to show that sufficient heating can be obtained for ice protection on modern transport airplanes,.
Contributing Partner: UNT Libraries Government Documents Department
Ionization in the knock zone of an internal-combustion engine

Ionization in the knock zone of an internal-combustion engine

Date: September 1, 1940
Creator: Hasting, Charles E
Description: The ionization in the knock zone of an internal-combustion engine was investigated. A suspected correlation between the intensity of knock and the degree of ionization was verified and an oscillation in the degree of ionization corresponding in frequency to the knock vibrations in the cylinder pressure was observed.
Contributing Partner: UNT Libraries Government Documents Department
Limits of single-stage compression in centrifugal superchargers for aircraft

Limits of single-stage compression in centrifugal superchargers for aircraft

Date: September 1, 1940
Creator: Kollmann, K
Description: The limits of the single-stage compression in superchargers at the present state of development are determined by five factors. 1) by the rotor material; 2) by the formation of the flow; 3) by the manufacture of double shrouded rotors; 4) by the bearing problem; 5) by the drive method.
Contributing Partner: UNT Libraries Government Documents Department
Poisoning of livestock by plants that produce hydrocyanic acid.

Poisoning of livestock by plants that produce hydrocyanic acid.

Date: September 1940
Creator: Couch, James F. (James Fitton), b. 1888.
Description: Describes how the presence of hydrocyanic acid in plants can poison livestock, how to prevent poisoning, and how to treat animals which have been poisoned.
Contributing Partner: UNT Libraries Government Documents Department
Preliminary Tests in the NACA Tank to Investigate the Fundamental Characteristics of Hydrofoils

Preliminary Tests in the NACA Tank to Investigate the Fundamental Characteristics of Hydrofoils

Date: September 1, 1940
Creator: Land, Norman S
Description: None
Contributing Partner: UNT Libraries Government Documents Department
Preliminary Tests in the NACA Tank to Investigate the Fundamental Characteristics of Hydrofoils

Preliminary Tests in the NACA Tank to Investigate the Fundamental Characteristics of Hydrofoils

Date: September 1, 1940
Creator: Ward, Kenneth E.
Description: This preliminary investigation was made to study the hydrodynamic properties and general behavior of simple hydrofoils. Six 5- by 30-inch plain, rectangular hydrofoils were tested in the NACA tank at various speeds, angles of attack and depths below the water surface. Two of the hydrofoils had sections representing the sections of commonly used airfoils, one had a section similar to one developed Guidoni for use with hydrofoil-equipped seaplane floats, and three had sections designed to have constant chordwise pressure distributions at given values of the lift coefficient for the purpose of delaying the speed at which cavitation begins. The experimental results are presented as curves of the lift and drag coefficients plotted against speed for the various angles of attack and depths for which the hydrofoils were tested. A number of derived curves are included for the purpose of better comparing the characteristics of the hydrofoils and to show the effects of depth. Several representative photographs show the development of cavitation on the the upper surface of the hydrofoils. The results indicate that properly designed hydrofoil sections will have excellent characteristics and that the speed at which cavitation occurs may be delayed to an appreciable extent by the use of ...
Contributing Partner: UNT Libraries Government Documents Department
Pressure and temperature measurement in supercharger investigations

Pressure and temperature measurement in supercharger investigations

Date: September 1, 1940
Creator: Franz, A
Description: With the further development of the supercharger, requirements with regard to measuring accuracy increase while at the same time the conditions under which the measurements must be carried out become more difficult. The present paper is a contribution toward the improvement and refinement of the measuring methods. For pressure measurements some suggestions are made with regard to design and location of the measuring stations. The question of temperature measurement in rapid air flow is discussed, new instruments for the direct measurement of the temperature in the rapid airstream are described and the results obtained with the various instruments presented.
Contributing Partner: UNT Libraries Government Documents Department
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