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Analysis of wind-tunnel stability and control tests in terms of flying qualities of full-scale airplanes

Description: The analysis of results of wind-tunnel stability and control tests of powered airplane models in terms of the flying qualities of full-scale airplanes is advocated. In order to indicated the topics upon which comments are considered desirable in the report of a wind-tunnel stability and control investigation and to demonstrate the nature of the suggested analysis, the present NACA flying-qualities requirements are discussed in relation to wind-tunnel tests. General procedures for the estimation of flying qualities from wind-tunnel tests are outlined.
Date: April 1, 1943
Creator: Kayten, Gerald G
Item Type: Report

Diesel Engines Underground: [Part] 4. Effect on Composition of Exhaust Gas of Variables Influencing Fuel Injection

Description: Report issued by the Bureau of Mines over diesel engine operations. As stated in the introduction, "it is the purpose of this report to present such data and to reemphasize the importance of adequate maintenance for diesel engines used underground" (p. 2). This report includes tables, and illustrations.
Date: April 1943
Creator: Holtz, John C.; Berger, L. B.; Elliott, M. A. & Schrenk, H. H.
Item Type: Report

Experimental Investigation of a Model of a Two-Stage Turboblower

Description: In the present paper an investigation is made of two stages of a multistage turboblower having a vaneless diffuser behind the impeller and guide vanes at the inlet to the nest stage. The method employed was that of investigating the performance of the successive elements of the blower (the impeller, vaneless diffuser, ets.) whereby the kinematics of the flow through the blower could be followed and the pressure at the different points computed. The character of the flow and the physical significance of the loss coefficients could thereby be determined so as to secure the best agreement of the computed with the actual performance of the blower. Since the tests were carried out for various delivery volumes, the dependence of the coefficients on a number of factors (angle of attack, velocities, etc.) could be obtained. The distribution of the losses that occur during the transformation of dynamic pressure at the impeller exit into static pressure could be found and likewise the range within which the friction coefficient varies in the vaneless diffuser. With the aid of factors having a certain physical significance, the centrifugal blower could be computed on the basis of a more or less schematical consideration of the phenomena occuring during the air flow through it, and the use of arbitrary factors and recourse to the geometrical similtude law thus avoided. The present investigation largely summarizes all the previous work af the CHI Blower Section on the different elements of a centrifugal blower. Some considerations on the analysis of model test data for application to full-scale are presented in the appendix.
Date: April 1, 1943
Creator: Dovjik, s. & Polikovsky, W.
Item Type: Report

Heat Transfer of Airfoils and Plates

Description: The few available test data on the heat dissipation of wholly or partly heated airfoil models are compared with the corresponding data for the flat plate as obtained by an extension of Prandtl's momentum theory, with differentiation between laminar and turbulent boundary layer and transitional region between both, the extent and appearance of which depend upon certain critical factors. The satisfactory agreement obtained justifies far-reaching conclusions in respect to other profile forms and arrangements of heated surface areas. The temperature relationship of the material quantities in its effect on the heat dissipation is discussed as far as is possible at tk.e present state of research, and it is shown that the profile drag of heated wing surfaces can increase or decrease with the temperature increase depending upon the momentarily existent structure of the boundary layer.
Date: April 1, 1943
Creator: Seibert, Otto
Item Type: Report

Newsmap. Monday, April 5, 1943 : week of March 26 to April 2, 186th week of the war, 68th week of U.S. participation

Description: Front: Text describes action on various war fronts: Tunisia, Russia, Southwest Pacific, Air offensive, Aleutians. Large world map is keyed to text and illustrates time zones around the world. Inset map shows Tunisia. Includes photographs: troops receiving daily news summaries, bombers in flight, M-10 tank destroyers, and a German Mark VI. Back: British Aircraft. 19 aircraft are identified by sketch or photograph. Text provides description of each.
Date: April 5, 1943
Creator: [United States.] Army Orientation Course
Item Type: Poster

Newsmap. Monday, April 12, 1943 : week of April 2 to April 9, 187th week of the war, 69th week of U.S. participation

Description: Front: Text describes action on various war fronts: Russia, Solomons, New Guinea, Aleutians, Bolivia, Tunisia, Air offensive. Large world map is keyed to text and illustrates time zones around the world. Inset maps show Sicily and Tunis. Includes photographs: Malaria control, Super block-buster [8,000 lb. aerial bomb], Change of ownership [captured Mercedes Benz troop-carrier], Bren-gun carriers support British Grenadiers in Kasserine Pass, Italian troops in the African war zone. Back: The Marine Corps. A unified fighting force. Graphic image shows helmeted Marine soldiers with rifles attacking a tropical island with ships and transport boats in background, as well as various photos of parachutes, bombardments, etc.
Date: April 12, 1943
Creator: [United States.] Army Orientation Course
Item Type: Poster

Newsmap. Monday, April 19, 1943 : week of April 9 to April 16, 188th week of the war, 70th week of U.S. participation

Description: Front: Text describes action on various war fronts: Tunisia -- Southwest Pacific -- Russia -- Mediterranean. Large world map is keyed to text and illustrates time zones around the world. Inset maps show Allied drive in Tunisia -- Japanese controlled areas throughout the Southwest Pacific. Includes photographs: Helping Rommel's run [puppy stationed atop a Vickers machine gun] -- So he can fight (Staff Sergt. Hollers clerks at the San Angelo AAF Bombardier School in Texas) -- Blimp training. Back: Tunisia, map with inset showing location of Tunisia in the Mediterranean area.
Date: April 19, 1943
Creator: [United States.] Army Orientation Course
Item Type: Poster

Newsmap. Monday, April 26, 1943 : week of April 16 to April 23 : 189th week of the war, 71st week of U.S. participation

Description: Text describes action on various war fronts: Tunisia, Raid on Japan, Southwest Pacific, Italy, Air offensive, Russia, Aleutians. Large world map is keyed to text. Shows United Nations countries, Axis and Axis occupied areas, countries with Axis relations broken, and neutral countries. Inset maps show Italy, Sardinia, and northern Tunisia; Axis held areas in Tunisia; Nazi held areas around the Sea of Azov. Back: Fox Holes: Dig!..Or Die! Photographs and illustrations describing proper fox hole preparation and use.
Date: April 26, 1943
Creator: [United States.] Army Orientation Course
Item Type: Poster

Pneumatic ponton bridge M3

Description: Discusses the purpose and usage of the pneumatic pontoon bridge M3 by infantry in the field. Covers construction, deployment, and maintenance.
Date: April 19, 1943
Creator: United States. War Department.
Item Type: Book

Quartermaster operations.

Description: Describes the organization and functions of the U.S. Army Quartermaster Corps.
Date: April 29, 1943
Creator: United States. War Department.
Item Type: Book

Theoretical Determination of Axial Fan Performance

Description: The report presents a method for the computation of axial fan characteristics. The method is based on the assumption that the law of constancy of the circulation along the blade holds, approximately, for all fan conditions for which the blade elements operate at normal angles of attack (up to the stalling angles). Pressure head coefficient K(sub a) and power coefficient K(sub u) for the force components in the axial and tangential directions, respectively, and analogous to the lift and drag coefficients C(sub y) and C(sub x) are conveniently introduced.
Date: April 1, 1943
Creator: Struve, E.
Item Type: Report