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  Partner: UNT Libraries Government Documents Department
 Collection: Technical Report Archive and Image Library
Some torsional-damping measurements of laminated beams as applied to the propeller stall-flutter problem

Some torsional-damping measurements of laminated beams as applied to the propeller stall-flutter problem

Date: April 29, 1953
Creator: Heath, Atwood R , Jr
Description: The structural damping in the torsion mode of vibration of a series of untwisted, laminated thin beams simulating propeller blades is presented. The number of lamination were varied, as well as the bonding material and the method of joining lamination. Application of the data to the calculation of the minimum flutter speed of thin propeller blades indicates that appreciable gains in the minimum flutter speed may be obtained for laminated blades using a Cycleweld bond.
Contributing Partner: UNT Libraries Government Documents Department
Some transonic aerodynamic charcteristics of a model similar to the mcdonnell f3h-2n airplane

Some transonic aerodynamic charcteristics of a model similar to the mcdonnell f3h-2n airplane

Date: May 15, 1956
Creator: Crabill, N. L. & Jackson, B. G.
Description: None
Contributing Partner: UNT Libraries Government Documents Department
Some wind-tunnel experiments on single-degree-of-freedom flutter of ailerons in the high subsonic speed range

Some wind-tunnel experiments on single-degree-of-freedom flutter of ailerons in the high subsonic speed range

Date: June 1, 1956
Creator: Clevenson, Sherman A
Description: None
Contributing Partner: UNT Libraries Government Documents Department
Some wind-tunnel results of an investigation of the flutter of sweptback- and triangular-wing models at Mach number 1.3

Some wind-tunnel results of an investigation of the flutter of sweptback- and triangular-wing models at Mach number 1.3

Date: May 22, 1952
Creator: Tuovila, W J
Description: None
Contributing Partner: UNT Libraries Government Documents Department
Some yawing tests of a 1/30-scale model of the hull of the XPB2M-1 flying boat

Some yawing tests of a 1/30-scale model of the hull of the XPB2M-1 flying boat

Date: July 1, 1943
Creator: Locke, F W S , Jr
Description: None
Contributing Partner: UNT Libraries Government Documents Department
The sonic altimeter for aircraft

The sonic altimeter for aircraft

Date: August 1, 1937
Creator: Draper, C S
Description: Discussed here are results already achieved with sonic altimeters in light of the theoretical possibilities of such instruments. From the information gained in this investigation, a procedure is outlined to determine whether or not a further development program is justified by the value of the sonic altimeter as an aircraft instrument. The information available in the literature is reviewed and condensed into a summary of sonic altimeter developments. Various methods of receiving the echo and timing the interval between the signal and the echo are considered. A theoretical discussion is given of sonic altimeter errors due to uncertainties in timing, variations in sound velocity, aircraft speed, location of the sending and receiving units, and inclinations of the flight path with respect to the ground surface. Plots are included which summarize the results in each case. An analysis is given of the effect of an inclined flight path on the frequency of the echo. A brief study of the acoustical phases of the sonic altimeter problem is carried through. The results of this analysis are used to predict approximately the maximum operating altitudes of a reasonably designed sonic altimeter under very good and very bad conditions. A final comparison is made ...
Contributing Partner: UNT Libraries Government Documents Department
A sonic-flow orifice probe for the in-flight measurements of temperature profiles of a jet engine exhaust with afterburning

A sonic-flow orifice probe for the in-flight measurements of temperature profiles of a jet engine exhaust with afterburning

Date: May 1, 1956
Creator: Havill, C Dewey & Rolls, L Stewart
Description: None
Contributing Partner: UNT Libraries Government Documents Department
Sonic-flow-orifice temperature probe for high-gas-temperature measurements

Sonic-flow-orifice temperature probe for high-gas-temperature measurements

Date: September 1, 1950
Creator: Blackshear, Perry L , Jr
Description: None
Contributing Partner: UNT Libraries Government Documents Department
Sound from a two-blade propeller at supersonic tip speeds

Sound from a two-blade propeller at supersonic tip speeds

Date: January 1, 1952
Creator: Hubbard, Harvey H & Lassiter, Leslie W
Description: Report presents the results of sound measurements at static conditions made for a two-blade 47-inch-diameter propeller in the tip Mach number range 0.75 to 1.30. For comparison, spectrums have been obtained at both subsonic and supersonic tip speeds. In addition, the measured data are compared with calculations by the theory of Gutin which has previously been found adequate for predicting the sound at subsonic tip speeds. Curves are presented from which the maximum over-all noise levels in free space may be estimated if the power, tip Mach number, and distance are known.
Contributing Partner: UNT Libraries Government Documents Department
Sound from a two-blade propeller at supersonic tip speeds

Sound from a two-blade propeller at supersonic tip speeds

Date: May 8, 1951
Creator: Hubbard, Harvey H & Lassiter, Leslie W
Description: None
Contributing Partner: UNT Libraries Government Documents Department