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 Decade: 1920-1929
 Serial/Series Title: NACA Technical Memorandums
 Collection: Technical Report Archive and Image Library
The transformation of heat in an engine

The transformation of heat in an engine

Date: April 1929
Creator: Neumann, Kurt
Description: This report presents a thermodynamic basis for rating heat engines. The production of work by a heat engine rests on the operation of supplying heat, under favorable conditions, to a working fluid and then taking it away.
Contributing Partner: UNT Libraries Government Documents Department
Effect of roughness on properties of airfoils

Effect of roughness on properties of airfoils

Date: August 1926
Creator: Schrenk, O
Description: The first group of a large series of contemplated experiments on the effect of roughness was intended to show the effect of great roughness on airfoils of various sizes and attitudes.
Contributing Partner: UNT Libraries Government Documents Department
Lift theory of supporting surfaces : second article

Lift theory of supporting surfaces : second article

Date: September 1921
Creator: Von Mises, R
Description: None
Contributing Partner: UNT Libraries Government Documents Department
Handley Page metal construction

Handley Page metal construction

Date: October 1, 1929
Creator: unknown
Description: In this report Handley Page construction techniques are shown such as: solid-drawn tubular duralumin spars are used in the stabilizer; plain channel sections are used extensively for minor components; and the manner of assembling them into a stabilizer compression strut is shown.
Contributing Partner: UNT Libraries Government Documents Department
Rules and regulations governing the Fokker Soaring-Flight Contest over water or level land

Rules and regulations governing the Fokker Soaring-Flight Contest over water or level land

Date: June 1, 1923
Creator: unknown
Description: None
Contributing Partner: UNT Libraries Government Documents Department
Replacing the weight of materials consumed on airships

Replacing the weight of materials consumed on airships

Date: June 1, 1923
Creator: Crocco, G A
Description: Two methods to replace the weight of gas lost on long airship flights are discussed: condensing the water of combustion and thermic sustentation. In the present article we will discuss the first method, leaving the second to be examined in a subsequent article.
Contributing Partner: UNT Libraries Government Documents Department
Building a full-size glider

Building a full-size glider

Date: September 1, 1927
Creator: Camm, F J
Description: The building and flying of a glider is possible for anyone who can use a few basic tools. This report presents some plans and techniques for building your own glider.
Contributing Partner: UNT Libraries Government Documents Department
The vector ruling protractor

The vector ruling protractor

Date: March 1, 1924
Creator: Zahm, A F
Description: The theory, structure and working of a vector slide rule is presented in this report. This instrument is used for determining a vector in magnitude and position when given its components and its moment about a point in their plane.
Contributing Partner: UNT Libraries Government Documents Department
Unsymmetrical forces in an airplane cell

Unsymmetrical forces in an airplane cell

Date: November 1, 1929
Creator: Vogt, R
Description: This paper calls attention to the desirability of expanding airplane building regulations to include proof of safety for cases of unsymmetrical loading, at least in the structural members which are thereby specially stressed.
Contributing Partner: UNT Libraries Government Documents Department
Effects of streamline curvature on lift of biplanes

Effects of streamline curvature on lift of biplanes

Date: June 1, 1927
Creator: Prandtl, L
Description: This report concerns, first, the determination of the lift of a wing which is situated in a curvilinear flow; and second, to calculate the curvature which one wing of a biplane produces in the vicinity of the other.
Contributing Partner: UNT Libraries Government Documents Department
Ultra-light alloys and their utilization on aircraft

Ultra-light alloys and their utilization on aircraft

Date: May 1, 1924
Creator: Defleury, R & Portevin, A M
Description: We will arbitrarily call alloys having a specific gravity of less than 2 "ultra-light", in order to distinguish them from "light" alloys with a specific gravity of 2 to 3. Thus far it has been possible to make ultra-light alloys only by employing a large proportion of magnesium.
Contributing Partner: UNT Libraries Government Documents Department
Force measurements on airplanes

Force measurements on airplanes

Date: June 1, 1929
Creator: Seewald, F
Description: The most essential phenomena of aircraft should be classified according to their origin and then measured. Information can thus be obtained in a quicker, cheaper, and more reliable way than otherwise would be possible.
Contributing Partner: UNT Libraries Government Documents Department
Longitudinal balancing of airplanes

Longitudinal balancing of airplanes

Date: February 1, 1923
Creator: Eteve, Albert
Description: The object of the present communication is to determine the best method for locating the center of lift of an airplane and to provide a method for making corrections. The method employed is very simple, being based on the positions given the elevator during flights at different speeds.
Contributing Partner: UNT Libraries Government Documents Department
"Schneebeli" and "Birger" silencers

"Schneebeli" and "Birger" silencers

Date: June 1, 1923
Creator: Dollfus, Charles
Description: The Schneebeli silencer is made entirely of soft sheet steel. It is connected with the engine for receiving the exhaust gases, and consists of two parts: the silencer proper and a conical exit. The Birger silencer, made by the Ad Astra Company in Switzerland, is based on the principle of rapid cooling of the exhaust gases.
Contributing Partner: UNT Libraries Government Documents Department
Determining the velocity distribution in the boundary layer of an airfoil fitted with a rotary cylinder

Determining the velocity distribution in the boundary layer of an airfoil fitted with a rotary cylinder

Date: May 1, 1927
Creator: Van Der Hegge Zijnen, B G
Description: In the closer investigation of the results obtained from a wing model with a rotary cylinder mounted in its leading edge (NACA TM's 307 and 354), the velocity distribution in the vicinity of the surface of the model was determined by a hot-wire anemometer. The results confirmed the belief that the rotary cylinder had considerable effect on the air flow, but demonstrated the fact that the direct influence of the cylinder is confined to a very thin layer in immediate proximity to the surface.
Contributing Partner: UNT Libraries Government Documents Department
Researches on ailerons and especially on the test loads to which they should be subjected

Researches on ailerons and especially on the test loads to which they should be subjected

Date: February 1, 1927
Creator: Sabatier, J
Description: Aileron calculations have hitherto given greatly differing results according to different authors. It seems to be the general opinion that it is only necessary to give the ailerons such dimensions that the airplane can maneuver well, that the stresses they must undergo are relatively small, and that they are strong enough if their framework is of the order of strength as the wings to which they are attached. This article will show that the problem is really quite complex and that it should receive more attention.
Contributing Partner: UNT Libraries Government Documents Department
Vorticism in aeronautics

Vorticism in aeronautics

Date: August 1, 1923
Creator: Sayers, W H
Description: Since the war there has been a considerable advance in knowledge on the subject of the airfoil and its behavior. The theory is now sufficiently advanced to make it possible to predict and to calculate certain results which previously could only be attained by direct experiment. The vortex theory receives special attention.
Contributing Partner: UNT Libraries Government Documents Department
Rules and regulations of the 1923 Rhon Soaring-Flight Contest

Rules and regulations of the 1923 Rhon Soaring-Flight Contest

Date: May 1, 1923
Creator: unknown
Description: None
Contributing Partner: UNT Libraries Government Documents Department
Device for measuring sound in airplane engines

Device for measuring sound in airplane engines

Date: June 1, 1924
Creator: Robrovsky, T
Description: I will here call attention to a device, constructed according to the system of Gati with which it is possible to measure the sound of an engine and test the effect of a silencer.
Contributing Partner: UNT Libraries Government Documents Department
Structural details of the giant Dornier seaplane "Do X."

Structural details of the giant Dornier seaplane "Do X."

Date: October 1929
Creator: Gustosa, Corrado
Description: None
Contributing Partner: UNT Libraries Government Documents Department
The protection of duralumin from corrosion

The protection of duralumin from corrosion

Date: March 1, 1927
Creator: Nelson, WM
Description: Different types of coatings to protect duralumin from corrosion are discussed. Plating, etching, brushing, coloring, painting and varnishing are all investigated.
Contributing Partner: UNT Libraries Government Documents Department
Contribution to the design and calculation of fuel cams and fuel valves for diesel engines

Contribution to the design and calculation of fuel cams and fuel valves for diesel engines

Date: August 1928
Creator: Basu, Jatrindra Nath
Description: In this work I have attempted to find a basis for the design of fuel cams, which will serve equally for large and small engines, both high-speed and low-speed.
Contributing Partner: UNT Libraries Government Documents Department
Structural details of German gliders

Structural details of German gliders

Date: November 1, 1927
Creator: Gymnich, Alfried
Description: The structural details such as wings, fuselage, landing gear, and steering organs of German gliders are detailed in this report.
Contributing Partner: UNT Libraries Government Documents Department
Travel of the center of pressure of airfoils transversely to the air stream

Travel of the center of pressure of airfoils transversely to the air stream

Date: September 1, 1929
Creator: Katzmayr, Richard
Description: The experiments here described were performed for the purpose of obtaining the essential facts concerning the distribution of the air force along the span. We did not follow, however, the time-consuming method of point-to-point measurements of the pressure distribution on the wing surfaces, but determined directly the moment of mean force about an axis passing through the middle of the span parallel to the direction of flight.
Contributing Partner: UNT Libraries Government Documents Department
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