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 Collection: National Advisory Committee for Aeronautics Collection
The "K 47" of the A.B. Flygindustri : An Armored Pursuit Monoplane

The "K 47" of the A.B. Flygindustri : An Armored Pursuit Monoplane

Date: August 1, 1929
Creator: Schulz, R
Description: None
Contributing Partner: UNT Libraries Government Documents Department
Latecoere Air Lines

Latecoere Air Lines

Date: August 1, 1925
Creator: Van Zandt, J Parker
Description: This article presents the observations of the authors on an inspection trip of the Latecoere Air Lines routes from Southern France into North Africa.
Contributing Partner: UNT Libraries Government Documents Department
An Approximate Method of Calculation of Relative Humidity Required to Prevent Frosting on Inside of Aircraft Pressure Cabin Windows, Special Report

An Approximate Method of Calculation of Relative Humidity Required to Prevent Frosting on Inside of Aircraft Pressure Cabin Windows, Special Report

Date: December 5, 1940
Creator: Jones, Alun R.
Description: This report has been prepare in response to a request for information from an aircraft company. A typical example was selected for the presentation of an approximate method of calculation of the relative humidity required to prevent frosting on the inside of a plastic window in a pressure type cabin on a high speed airplane. The results of the study are reviewed.
Contributing Partner: UNT Libraries Government Documents Department
Comments on crankless engine types

Comments on crankless engine types

Date: May 1, 1928
Creator: unknown
Description: This report describes the leading crankless engine types, which have appeared in recent years. These types include: the Mitchell crankless motor car engine and the German Michel engine.
Contributing Partner: UNT Libraries Government Documents Department
Crank case scavenging of a two-stroke-cycle engine

Crank case scavenging of a two-stroke-cycle engine

Date: January 1, 1928
Creator: Holm, Otto
Description: Experiments with a two-stroke-cycle, crank case scavenging engine. Effect of systematic variation of the height of the scavenge and exhaust ports on the scavenging, as determined by gas analysis. The best results were obtained under conditions differing from the usual ones.
Contributing Partner: UNT Libraries Government Documents Department
Take-off of heavily loaded airplanes

Take-off of heavily loaded airplanes

Date: April 1, 1928
Creator: Proll, A
Description: In the present article, several suggestions will be made for shortening the otherwise long take-off distance. For the numerical verification of the process, I will use a graphic method for determining the take-off distance of seaplanes.
Contributing Partner: UNT Libraries Government Documents Department
Preliminary Investigation of the Effect of Compressibility on the Maximum Lift Coefficient, Special Report

Preliminary Investigation of the Effect of Compressibility on the Maximum Lift Coefficient, Special Report

Date: February 1, 1943
Creator: Stack, John; Fedziuk, Henry A. & Cleary, Harold E.
Description: Preliminary data are presented on the variation of the maximum lift coefficient with Mach number. The data were obtained from tests in the 8-foot high-speed tunnel of three NACA 16-series airfoils of 1-foot chord. Measurements consisted primarily of pressure-distribution measurements in order to illustrate the nature of the phenomena. It was found that the maximum lift coefficient of airfoils is markedly affected by compressibility even at Mach numbers as low as 0.2. At high Mach numbers pronounced decrease of the maximum lift coefficient was found. The magnitude of the effects of compressibility on the maximum lift coefficient and the low speeds at which these effects first appear indicate clearly that consideration of the take-off thrust for propellers will give results seriously in error if these considerations are based on the usual low-speed maximum-lift-coefficient data generally used.
Contributing Partner: UNT Libraries Government Documents Department
Tensile strength of welded steel tubes : first series of experiments

Tensile strength of welded steel tubes : first series of experiments

Date: January 1, 1928
Creator: Rechtlich, A
Description: The purpose of the experiments was to determine the difference in the strength of steel tubes welded by different methods, as compared with one another and also with unwelded, unannealed tubes, including; moreover, a comparison of the results obtained by experienced and inexperienced welders.
Contributing Partner: UNT Libraries Government Documents Department
Stressed coverings in naval and aeronautic construction

Stressed coverings in naval and aeronautic construction

Date: January 1, 1928
Creator: Kahn, L L
Description: We propose to make a study of the difficulties in using stressed coverings and their appropriate solutions. Fatigue and buckling are also discussed.
Contributing Partner: UNT Libraries Government Documents Department
Tests of an NACA 66,2-420 Airfoil of 5-Foot Chord at High Speed, Special Report

Tests of an NACA 66,2-420 Airfoil of 5-Foot Chord at High Speed, Special Report

Date: September 1, 1942
Creator: Hood, Manley J. & Anderson, Joseph L.
Description: This report covers tests of a 5-foot model of the NACA 66,2-420 low-drag airfoil at high speeds including the critical compressibility speed. Section coefficients of lift, drag, and pitching moment, and extensive pressure-distribution data are presented. The section drag coefficient at the design lift coefficient of 0.4 increased from 0.0042 at low speeds to 0.0052 at a Mach number of 0.56 (390 mph at 25,000 ft altitude). The critical Mach number was about 0.60. The results cover a Reynold number range from 4 millions to 17 millions.
Contributing Partner: UNT Libraries Government Documents Department