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  Partner: UNT Libraries Government Documents Department
 Serial/Series Title: NACA Advanced Confidential Report
 Collection: National Advisory Committee for Aeronautics Collection
Investigation of the behavior of parallel two-dimensional air jets

Investigation of the behavior of parallel two-dimensional air jets

Date: November 1, 1944
Creator: Corrsin, Stanley
Description: None
Contributing Partner: UNT Libraries Government Documents Department
An Experimental Investigation of Several Low-Drag Wing-Nacelle Combinations with Internal Air Flow

An Experimental Investigation of Several Low-Drag Wing-Nacelle Combinations with Internal Air Flow

Date: March 1, 1945
Creator: Allen, H. Julian; Frick, Charles W. & Erickson, Myles D.
Description: The results of an experimental investigation of several low-drag wing-nacelle combinations, incorporating internal air-flow systems, are presented. The external-drag increments due to these nacelles are between one-half and two-thirds of those of conventional nacelle forms. This improvement is accomplished with only minor effects on the lift and moment characteristics of the wing. The procedure employed to determine the external shape of such low-drag nacelles is considered in detail. The design of an efficient internal-flow system with or without a blower or throttle, presents no serious problems. The energy losses in the expansion before the engine and the contraction thereafter can be kept small. It is believed that these nacelles have a wide application in housing engine pusher-propeller units and, with some alteration, jet-propulsion devices. It is probable that the low external drags may not be realized if such nacelles are used with a tractor propeller because of the high level of turbulence in the propeller slipstream.
Contributing Partner: UNT Libraries Government Documents Department
Tests of a heated low-drag airfoil

Tests of a heated low-drag airfoil

Date: December 1, 1942
Creator: Frick, C. W., Jr. & Mccullough, G. B.
Description: None
Contributing Partner: UNT Libraries Government Documents Department
Wind-Tunnel Development of Ailerons for the Curtiss XP-60 Airplanem Special Report

Wind-Tunnel Development of Ailerons for the Curtiss XP-60 Airplanem Special Report

Date: September 1, 1942
Creator: Rogallo, F. M. & Lowry, John G.
Description: An investigation was made in the LWAL 7- by 10-foot tunnel of internally balanced, sealed ailerons for the Curtiss XP-60 airplane. Ailerons with tabs and. with various amounts of balance were tested. Stick forces were estimated for several aileron arrangements including an arrangement recommended for the airplane. Flight tests of the recommended arrangement are discussed briefly in an appendix, The results of the wind-tunnel and flight tests indicate that the ailerons of large or fast airplanes may be satisfactorily balanced by the method developed.
Contributing Partner: UNT Libraries Government Documents Department
Correlation of flight data on limit pressure coefficients and their relation to high-speed burbling and critical tail loads

Correlation of flight data on limit pressure coefficients and their relation to high-speed burbling and critical tail loads

Date: September 1, 1944
Creator: Rhode, Richard V
Description: None
Contributing Partner: UNT Libraries Government Documents Department
NACA Radio Ground-Speed System for Aircraft, Special Report

NACA Radio Ground-Speed System for Aircraft, Special Report

Date: February 1, 1943
Creator: Hastings, Charles E.
Description: A method that utilizes the Doppler effect on radio signals for determining the speed of an airplane and the distance traveled by the airplane has been developed and found to operate satisfactorily. In this method, called the NACA radio ground-speed system, standard readily available radio equipment is used almost exclusively and extreme frequency stability of the transmitters is not necessary. No complicated equipment need be carried in the airplane, as the standard radio transmitter is usually adequate. Actual flight tests were made in which the method was used and the results were consistent with calibrated air speed indications and stop-watch measurements. Inasmuch as the fundamental accuracy of the radio method is far better than either of the checking systems used, no check was made on the limitations of the accuracy.
Contributing Partner: UNT Libraries Government Documents Department
Determination of Flight Paths of an SBD-1 Airplane in Simulated Diving Attacks, Special Report

Determination of Flight Paths of an SBD-1 Airplane in Simulated Diving Attacks, Special Report

Date: March 1, 1943
Creator: Johnson, Harold I.
Description: An investigation has been made to determine the motions of and the flight paths describe by a Navy dive-bombing airplane in simulated diving attacks. The data necessary to evaluate these items, with the exception of the atmospheric wind data, were obtained from automatic recording instruments installed entirely within the airplane. The atmospheric wind data were obtained from the ground by the balloon-theodolite method. The results of typical dives at various dive angles are presented in the form of time histories of the motion of the airplane as well as flight paths calculated with respect to still air and with respect to the ground.
Contributing Partner: UNT Libraries Government Documents Department
The Effect of Compressibility on the Growth of the Laminar Boundary Layer on Low-Drag Wings and Bodies

The Effect of Compressibility on the Growth of the Laminar Boundary Layer on Low-Drag Wings and Bodies

Date: January 1, 1943
Creator: Allen, H. Julian & Nitzberg, Gerald E.
Description: The development of the laminar boundary layer in a compressible fluid is considered. Formulas are given for determining the boundary-layer thickness and the ratio of the boundary-layer Reynolds number to the body Reynolds number for airfoils and bodies of revolution. It i s shown that the effect of compressibility will profoundly alter the Reynolds number corresponding to the upper limit of the range of the low-drag coefficients . The available data indicate that for low-drag and high critical compressibility speed airfoils and bodies of revolution, this effect is favorable.
Contributing Partner: UNT Libraries Government Documents Department
A method for the rapid estimation of turbulent boundary-layer thickness for calculating profile drag

A method for the rapid estimation of turbulent boundary-layer thickness for calculating profile drag

Date: July 1, 1944
Creator: Tetervin, Neal
Description: None
Contributing Partner: UNT Libraries Government Documents Department
The theory of propellers II : method for calculating the axial interference velocity

The theory of propellers II : method for calculating the axial interference velocity

Date: November 1, 1944
Creator: Theodorsen, Theodore
Description: None
Contributing Partner: UNT Libraries Government Documents Department
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