You limited your search to:

  Partner: UNT Libraries Government Documents Department
 Decade: 1920-1929
 Collection: National Advisory Committee for Aeronautics Collection
On the elementary relation between pitch, slip, and propulsive efficiency

On the elementary relation between pitch, slip, and propulsive efficiency

Date: July 1, 1920
Creator: Froude, W
Description: The author examines the current theory on the importance of reducing slip in airplane propellers. The author feels an exaggerated importance is attached to this supposition and feels that the increase in friction by an increase in propeller area or number of revolutions can't be discounted.
Contributing Partner: UNT Libraries Government Documents Department
The Oehmichen Peugeot helicopter

The Oehmichen Peugeot helicopter

Date: January 1, 1921
Creator: unknown
Description: The first flights of the Oehmichen helicopter are detailed as well as various aspects of the construction.
Contributing Partner: UNT Libraries Government Documents Department
The coupling of engines

The coupling of engines

Date: April 1, 1921
Creator: Boccaccio, Paul
Description: This report examines the idea of coupling numerous engines together to turn a single propeller, which the author feels would free aircraft design from the problems of multi-engine and propeller design.
Contributing Partner: UNT Libraries Government Documents Department
The Goebel rotary engine

The Goebel rotary engine

Date: March 1, 1921
Creator: unknown
Description: This report presents a table of specifications of the rotary engine and a very brief description of some of the notable features such as the exhaust valves controlled by means of a fixed cam gear.
Contributing Partner: UNT Libraries Government Documents Department
Commercial aviation in Germany : past and future

Commercial aviation in Germany : past and future

Date: February 1, 1921
Creator: Wronsky, W
Description: This review of commercial aviation includes postal delivery, package transport, and passenger transport. Both airplanes and airships are covered in this review.
Contributing Partner: UNT Libraries Government Documents Department
The law relating to air currents

The law relating to air currents

Date: March 1, 1921
Creator: unknown
Description: In the subdivided wing section profile, the diagram of the current is entirely changed and the harmful formation of eddies is avoided through premature deflection. Pressure equalization does not occur between the upper and under sides. This report presents a discussion of the various laws relating to wing design with the conclusion being that lift increases with more acute angles of attack.
Contributing Partner: UNT Libraries Government Documents Department
Experience with geared propeller drives for aviation engines

Experience with geared propeller drives for aviation engines

Date: September 1, 1920
Creator: Kutzbach, K
Description: I. The development of the gear wheels: (a) bending stresses; (b) compressive stresses; (c) heating; (d) precision of manufacture. II. General arrangement of the gearing. III. Vibration in the shaft transmission. An overview is given of experience with geared propeller drives for aviation engines. The development of gear wheels is discussed with emphasis upon bending stresses, compressive stresses, heating, and precision in manufacturing. With respect to the general arrangement of gear drives for airplanes, some principal rules of mechanical engineering that apply with special force are noted. The primary vibrations in the shaft transmission are discussed. With respect to vibration, various methods for computing vibration frequency and the influence of elastic couplings are discussed.
Contributing Partner: UNT Libraries Government Documents Department
Tests of the Daimler D-IVa engine at a high altitude test bench

Tests of the Daimler D-IVa engine at a high altitude test bench

Date: October 1, 1920
Creator: Noack, W G
Description: Reports of tests of a Daimler IVa engine at the test-bench at Friedrichshafen, show that the decrease of power of that engine, at high altitudes, was established, and that the manner of its working when air is supplied at a certain pressure was explained. These tests were preparatory to the installation of compressors in giant aircraft for the purpose of maintaining constant power at high altitudes.
Contributing Partner: UNT Libraries Government Documents Department
Italian and French experiments on wind tunnels

Italian and French experiments on wind tunnels

Date: November 1, 1920
Creator: Knight, WM
Description: Given here are the results of experiments conducted by Colonel Costanzi of the Italian Army to determine the influence of the surrounding building in which a wind tunnel was installed on the efficiency of the installation, and how the efficiency of the installation was affected by the design of the tunnel. Also given are the results of a series of experiments by Eiffel on 34 models of tunnels of different dimensions. This series of experiments was started in order to find out if, by changing the shape of the nozzle or of the diffuser of the large tunnel at Auteuil, the efficiency of the installation could be improved.
Contributing Partner: UNT Libraries Government Documents Department
Notes on specifications for French airplane competitions

Notes on specifications for French airplane competitions

Date: October 1, 1920
Creator: Margoulis, W
Description: Given here are the rules officially adopted by the Aeronautical Commission of the Aero Club of France for a flight competition to be held in France in 1920 at the Villacoublay Aerodrome. The prize will be awarded to the pilot who succeeds in obtaining the highest maximum and lowest minimum speeds, and in landing within the shortest distance.
Contributing Partner: UNT Libraries Government Documents Department