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Friction of aviation engines

Description: "The first portion of this report discusses measurements of friction made in the altitude laboratory of the Bureau of Standards between 1920 and 1926 under research authorization of the National Advisory Committee for Aeronautics. These are discussed with reference to the influence of speed, barometric pressure, jacket-water temperature, and throttle opening upon the friction of aviation engines. The second section of the report deals with measurements of the friction of a group of pistons diff… more
Date: 1928
Creator: Sparrow, S. W. & Thorne, M. A.
Item Type: Refine your search to only Report
open access

Full Scale Drag Tests on Various Parts of Sperry Messenger Airplane

Description: "The drag of a Sperry Messenger airplane with the wings removed, and also the drag of its various component parts, was measured in the 20-foot air stream of the N.A.C.A. propeller research tunnel at air speeds from 50 to 100 m.p.h. It was found that the three-cylinder radial air-cooled engine nearly doubled the drag of the bare fuselage, and the drag of the landing gear was about the same as that of the fuselage and engine combined" (p. 1).
Date: January 1928
Creator: Weick, Fred E.
Item Type: Refine your search to only Report
open access

A full-scale investigation of ground effect

Description: "This report describes flight tests which were made with the Vought VE-7 airplane to determine the effects of flying close to the ground. It is found that the drag of an airplane is materially reduced upon approaching the ground and that the reduction may be satisfactorily calculated according to theoretical formulas. Several aspects of ground effect which have had much discussion are explained" (p. 3).
Date: 1928
Creator: Reid, Elliott G.
Item Type: Refine your search to only Report
open access

Full Scale Tests of Wood Propellers on a VE-7 Airplane in the Propeller Research Tunnel

Description: "The investigation described in this report was made primarily to afford a comparison between propeller tests in the new propeller research tunnel and flight tests and small model tests on propellers. Three wood propellers which had been previously tested in flight on a VE-7 airplane, and of which models had also been tested in a wind tunnel, were tested again on a VE-7 airplane in the propeller research tunnel. The results of these tests are in fair agreement with those of the flight and model… more
Date: June 18, 1928
Creator: Weick, Fred E.
Item Type: Refine your search to only Report
open access

Full Scale Tests on a Thin Metal Propeller at Various Tip Speeds

Description: "This report describes an investigation made in order to determine the effect of tip speed on the characteristics of a thin-bladed metal propeller. The propeller was mounted on a VE-7 airplane with a 180-HP E-2 engine, and tested in the 20-foot propeller research tunnel of the National Advisory Committee for Aeronautics. It was found that the effect of tip speed on the propulsive efficiency was negligible within the range of the tests, which was from 600 to 1,000 feet per second (about 0.5 to 0… more
Date: June 20, 1928
Creator: Weick, Fred E.
Item Type: Refine your search to only Report
open access

Full-Scale Wind-Tunnel Tests of a Series of Metal Propellers on a VE-7 Airplane

Description: "An adjustable blade metal propeller was tested at five different angle settings, forming a series varying in pitch. The propeller was mounted on a VE-7 airplane in the twenty-foot propeller research tunnel of the National Advisory Committee for Aeronautics. The efficiencies were found to be from 4 to 7 per cent higher than those of standard wood propellers operating under the same conditions. The results are given in convenient form for use in selecting propellers for aircraft" (p. 521).
Date: July 13, 1928
Creator: Weick, Fred E.
Item Type: Refine your search to only Report
open access

The Gaseous Explosive Reaction: A Study of the Kinetics of Composite Fuels

Description: "This report deals with the results of a series of studies of the kinetics of gaseous explosive reactions where the fuel under observation, instead of being a simple gas, is a known mixture of simple gases. In the practical application of the gaseous explosive reaction as a source of power in the gas engine, the fuels employed are composite, with characteristics that are apt to be due to the characteristics of their components and hence may be somewhat complex" (p. 503).
Date: April 25, 1928
Creator: Stevens, F. W.
Item Type: Refine your search to only Report
open access

Gluing Practice at Aircraft Manufacturing Plants and Repair Stations

Description: This report records observations and recommendations resulting from an inspection trip to representative aircraft manufacturing establishments and repair stations. This inspection was made for the Navy Department and was specifically in reference to gluing practice at the various places visited. The period of the visits was between November 23, 1926 and February 16, 1927.
Date: July 1928
Creator: Truax, T. R.
Item Type: Refine your search to only Report
open access

Harvesting grain sorghums.

Description: Describes methods and equipment used for harvesting, threshing, and storing grain sorghums in the Great Plains of the United States.
Date: September 1928
Creator: Martin, John H. (John Holmes), 1893-; Reynoldson, L. A. (Le Roy August), b. 1886; Rothgeb, Benton E. & Hurst, W. M. (Wilbur Magruder), 1898-
Item Type: Refine your search to only Book
open access

Helium Tables

Description: These tables are intended to provide a standard method and to facilitate the calculation of the quantity of "Standard Helium" in high pressure containers. The research data and the formulas used in the preparation of the tables were furnished by the Research Laboratory of Physical Chemistry, of the Massachusetts Institute of Technology.
Date: January 1928
Creator: Havill, Clinton H.
Item Type: Refine your search to only Report
open access

Ignition and Combustion Phenomena in Diesel Engines

Description: Evidences were found that neither gasification nor vaporization of the injected fuel occurs before ignition; also that the hydrogen coefficient has no significance. However the knowledge of the ignition point and of the "time lag" is important. After ignition, the combustion proceeds in a series of reactions, the last of which at least are now known.
Date: October 1928
Creator: Sass, F.
Item Type: Refine your search to only Report
open access

Ignition Points and Combustion Reactions in Diesel Engines: Part 1

Description: The question of whether the fuel should be adapted to the engine or whether it is possible to improve equipment such as carburetors and engines so that as much of the crude oil as possible may be used without further transformation is examined in this report. Various ignition points and fuel mixtures are investigated in this regard.
Date: October 1928
Creator: Tausz, J. & Schulte, F.
Item Type: Refine your search to only Report
open access

Influence of Fuselage on Propeller Design

Description: "In the present paper I shall not consider the problem of the best arrangement of airplane and propeller, but only a simple method for designing a propeller for a given arrangement of airplane parts. The inflow to the propeller and hence the efficiency of the propeller is affected most by the fuselage. The effect of the wings and of the other parts lying in the propeller slip stream is much less and is also more difficult to determine" (p. 1-2).
Date: December 1928
Creator: Troller, Theodor
Item Type: Refine your search to only Report
open access

Investigation of Air Flow in Open-Throat Wind Tunnels

Description: "Tests were conducted on the 6-inch wind tunnel of the National Advisory Committee for Aeronautics to form a part of a research on open-throat wind tunnels. The primary object of this part of the research was to study a type of air pulsation which has been encountered in open-throat tunnels, and to find the most satisfactory means of eliminating such pulsations. In order to do this it was necessary to study the effects of different variable on all of the important characteristics of the tunnel"… more
Date: September 26, 1928
Creator: Jacobs, Eastman N.
Item Type: Refine your search to only Report
open access

Investigation of damping liquids for aircraft instruments

Description: "This report covers the results of an investigation carried on at the Bureau of Standards under a research authorization from, and with the financial assistance of, the National Advisory Committee for Aeronautics. The choice of a damping liquid for aircraft instruments is difficult owing to the range of temperature at which aircraft operate. Temperature changes affect the viscosity tremendously. The investigation was undertaken with the object of finding liquids of various viscosities otherwise… more
Date: May 16, 1928
Creator: Keulegan, G. H.
Item Type: Refine your search to only Report
open access

An Investigation of the Aerodynamic Characteristics of an Airplane Equipped with Several Different Sets of Wings

Description: This investigation was conducted by the National Advisory Committee for Aeronautics at Langley Field, Va., at the request of the Army Air Corps, for the purpose of comparing the full scale lift and drag characteristics of an airplane equipped with several sets of wings of commonly used airfoil sections. A Sperry Messenger Airplane with wings of R.A.F.-15, U.S.A.-5, U.S.A.-27, and Gottingen 387 airfoil sections was flown and the lift and drag characteristics of the airplane with each set of wing… more
Date: July 9, 1928
Creator: Crowley, J. W., Jr. & Green, M. W.
Item Type: Refine your search to only Report
open access

An Investigation of the Use of Discharge Valves and an Intake Control for Improving the Performance of N.A.C.A. Roots Type Supercharger

Description: "This report presents the results of an analytical investigation on the practicability of using mechanically operated discharge valves in conjunction with a manually operated intake control for improving the performance of N. A. C. A. Roots type superchargers. These valves, which may be either of the oscillating or rotating type, are placed in the discharge opening of the supercharger and are so shaped and synchronized with the supercharger impellers that they do not open until the air has been… more
Date: June 29, 1928
Creator: Schey, Oscar W. & Wilson, Ernest E.
Item Type: Refine your search to only Report
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