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 Decade: 1940-1949
 Year: 1947
 Month: September
 Collection: National Advisory Committee for Aeronautics Collection
Acceleration Measurements During Landings of a 1/5.5-Size Dynamic Model of the Columbia XJL-1 Amphibian in Smooth Water and in Waves: Langley Tank Model 208M, TED No. NACA 2336

Acceleration Measurements During Landings of a 1/5.5-Size Dynamic Model of the Columbia XJL-1 Amphibian in Smooth Water and in Waves: Langley Tank Model 208M, TED No. NACA 2336

Date: September 25, 1947
Creator: Clement, Eugene P. & Havens, Robert F.
Description: A 1/5.5-size powered dynamic model of the Columbia XJL-1 amphibian was landed in Langley tank no. 1 in smooth water and in oncoming waves of heights from 2.1 feet to 6.4 feet (full-size) and lengths from 50 feet to 264 feet (full-size). The motions and the vertical accelerations of the model were continuously recorded. The greatest vertical acceleration measured during the smooth-water landings was 3.1g. During landings in rough water the greatest vertical acceleration measured was 15.4g, for a landing in 6.4-foot by 165-foot waves. The impact accelerations increased with increase in wave height and, in general, decreased with increase in wave length. During the landings in waves the model bounced into the air at stalled attitudes at speeds below flying speed. The model trimmed up to the mechanical trim stop (20 deg) during landings in waves of heights greater than 2.0 feet. Solid water came over the bow and damaged the propeller during one landing in 6.4-foot waves. The vertical acceleration coefficients at first impact from the tank tests of a 1/5.5-size model were in fair agreement with data obtained at the Langley impact basin during tests of a 1/2-size model of the hull.
Contributing Partner: UNT Libraries Government Documents Department
An analysis of longitudinal-control problems encountered in flight at transonic speeds with a jet-propelled airplane

An analysis of longitudinal-control problems encountered in flight at transonic speeds with a jet-propelled airplane

Date: September 25, 1947
Creator: Brown, Harvey H; Rolls, L Stewart & Clousing, Lawrence A
Description: None
Contributing Partner: UNT Libraries Government Documents Department
An application of lifting-surface theory to the prediction of angle-of-attack hinge-moment parameters for aspect ratio 4.5 wings

An application of lifting-surface theory to the prediction of angle-of-attack hinge-moment parameters for aspect ratio 4.5 wings

Date: September 1, 1947
Creator: Jones, Arthur L; Flanagan, Mildred G & Sluder, Loma
Description: None
Contributing Partner: UNT Libraries Government Documents Department
Calculations and Experimental Investigations on the Feed-Power Requirement of Airplanes with Boundary-Layer Control

Calculations and Experimental Investigations on the Feed-Power Requirement of Airplanes with Boundary-Layer Control

Date: September 1, 1947
Creator: Krueger, W.
Description: Calculations and test results are given about the feed-power requirement of airplanes with boundary-layer control. Curves and formulas for the rough estimate of pressure-loss and feed-power requirement are set up for the investigated arrangements which differ structurally and aerodynamically. According to these results the feed power for three different designs is calculated at the end of the report.
Contributing Partner: UNT Libraries Government Documents Department
Comparison of the control-force characteristics of two types of lateral-control system for large airplanes

Comparison of the control-force characteristics of two types of lateral-control system for large airplanes

Date: September 1, 1947
Creator: Deters, Owen J
Description: None
Contributing Partner: UNT Libraries Government Documents Department
Compressive strength of 24S-T aluminum-alloy flat panels with longitudinal formed hat-section stiffeners having a ratio of stiffener thickness to skin thickness equal to 1.00

Compressive strength of 24S-T aluminum-alloy flat panels with longitudinal formed hat-section stiffeners having a ratio of stiffener thickness to skin thickness equal to 1.00

Date: September 1, 1947
Creator: Hickman, William A & Dow, Norris F
Description: None
Contributing Partner: UNT Libraries Government Documents Department
Determination of the Stress Concentration Factor of a Stepped Shaft Stressed in Torsion by Means of Precision Strain Gages

Determination of the Stress Concentration Factor of a Stepped Shaft Stressed in Torsion by Means of Precision Strain Gages

Date: September 1, 1947
Creator: Weigand, A.
Description: The stress distribution in stepped shafts stressed in torsion is determined by means of the electric precision strain gage the stress concentration factor is ascertained from the measurements. It is shown that the test values always are slightly lower than the values resulting from an approximate formula.
Contributing Partner: UNT Libraries Government Documents Department
Development and Construction of an Interferometer for Optical Measurements of Density Fields

Development and Construction of an Interferometer for Optical Measurements of Density Fields

Date: September 1, 1947
Creator: Zobel, Th.
Description: A method of interference is described in the present report which promises profitable application in aeronautical research. The physical foundation of the method and a simple method of adjustment are briefly discussed. The special technical construction of the instrument is described which guarantees its use also in the case of vibrations of the surrounding space and permits the investigation of unsteady phenomena. It is found that the interference method will make the small differences in density in the flow field around the body even at low speeds. (40 m/sec) optically measurable.
Contributing Partner: UNT Libraries Government Documents Department
Effect of variation in diameter and pitch of rivets on compressive strength of panels with Z-section stiffeners : panels of various lengths with close stiffener spacing

Effect of variation in diameter and pitch of rivets on compressive strength of panels with Z-section stiffeners : panels of various lengths with close stiffener spacing

Date: September 1, 1947
Creator: Dow, Norris F & Hickman, William A
Description: None
Contributing Partner: UNT Libraries Government Documents Department
The effects of yawing thin pointed wings at supersonic speeds

The effects of yawing thin pointed wings at supersonic speeds

Date: September 1, 1947
Creator: Evvard, John C
Description: None
Contributing Partner: UNT Libraries Government Documents Department
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