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Static Longitudinal Stability Characteristics of a Series of 90-Millimeter Artillery Shells at Mach Numbers of 0.8, 0.9, 1.0, and 1.2

Description: Wind-tunnel tests have been made to determine the static longitudinal stability of several models of a short-range artillery shell at Mach numbers of 0.8, 0.9, 1.0, and 1.2. The results of the tests indicated that the best of the spool-shaped shells was statically stable in pitch at all test Mach numbers for an angle-of-attack range up to about 10 degrees. The best of the finned shells was stable to a maximum angle of attack of about 6 degrees. The addition of a probe to the nose of the finned shells resulted in increased static longitudinal stability at the highest Mach numbers tested and in a large decrease in the axial-force coefficients at all Mach numbers.
Date: April 10, 1956
Creator: Spooner, Stanley H.
Partner: UNT Libraries Government Documents Department

Experimental stress analysis of stiffened cylinders with cutouts: Shear load

Description: A cylindrical semimonocoque shell of circular cross section was mounted as a cantilever and loaded by a direct shear at the tip. The cylinder was tested with no cutout, with a rectangular cutout on the tension side, and with the cutout centered on the neutral axis on one side of the cylinder. The cutout was successively enlarged through six sizes varying from 30 degrees to 130 degrees in circumference and from 1 and 2 bays in length. Strain measurements were made with resistance-type wire strain gages near the cutout on the stringers, the skin, and the rings for each case, and the stresses obtained are presented in tables. (author).
Date: July 1954
Creator: Schlechte, Floyd R. & Rosecrans, Richard
Partner: UNT Libraries Government Documents Department

Full-scale investigation of cooling shroud and ejector nozzle for a turbojet engine: afterburner installation

Description: From Summary: "A full-scale ejector cooling investigation was made on a turbojet engine - afterburner installation in the NACA Lewis altitude wind tunnel. Ejector performance was studied at primary exhaust-gas temperatures from 2700 degrees to 3400 degrees R (corresponding to ejector temperature ratios from 2.0 to 5.0), primary pressure ratios from 1.79 to 3.4, secondary air flows up to 29 percent of the primary gas flow, and for diameter ratios from 1.08 to 1.42 and spacing ratios from 0.04 to 1.16. In addition, variations were made in the primary exhaust-nozzle area."
Date: December 17, 1951
Creator: Wallner, Lewis E. & Jansen, Emmert T.
Partner: UNT Libraries Government Documents Department

Characterization of Russian ballistic furnace shells, February, 1999, batch

Description: This report documents the characterization of the latest batch of shells produced in the Ballistic Furnace System at the Lebedev Physical Institute, Moscow, Russia, that we received in mid-February, 1999. The batch consisted of three cassettes containing 36 shells in each cassette. An initial sphericity measurement was done, each shell was weighed, and shells were selected that were spherical enough to run on the Sphere Mapper AFM.
Date: April 2, 1999
Creator: Fearon, E
Partner: UNT Libraries Government Documents Department

Wind-tunnel investigation of the effect of spin on the aerodynamic characteristics of a 60-millimeter T-24 mortar shell with several tail-fin configurations

Description: Report presenting an investigation in the high-speed tunnel to determine the effect of spin on the aerodynamic characteristics of a 60-millimeter T-24 mortar shell with several different tail-fin configurations. Tests were made at a range of airspeeds, speeds of rotation, and angles of attack. Results regarding forced-spin tests, free-spin tests, and zero-spin tests are provided.
Date: March 21, 1957
Creator: Kemp, William B., Jr. & Hayes, William C., Jr.
Partner: UNT Libraries Government Documents Department

OBSERVATIONS OF STRESSES AND STRAINS NEAR INTERSECTIONS OF CONICAL AND CYLINDRICAL SHELLS

Description: To test theory, models of the interaction of a conical and cylindrical shell, having three different apex angles in the cone and three different ratios of thickness to cylinder diameter, were subjected to internal hydrostatic pressure and the resulting strains at various points were measured. Careful studies were made of the unavoidable imperfections in the models. The results are in substantiai agreement with the Wenk-Taylor approximate theory described in TMB Report 826 and with the approximate theory of Geckeler. Comparisons are aiso made with other theories. (auth)
Date: March 1, 1956
Creator: Borg, M.F.
Partner: UNT Libraries Government Documents Department

Truncilla sp., Specimen #1557

Description: One preserved mussel specimen including the left valve only. The specimen exhibits an elliptical shape; white internal coloring; off-white external coloring; no external sculpturing. The specimen measures between 0 - 60 mm in length and was assessed to be very-recently dead when collected.
Date: December 8, 1968
Creator: Pratt, W. L.
Partner: Elm Fork Natural Heritage Museum

Strophitus undulatus, Specimen #1421

Description: One preserved mussel specimen including both the left and right valves. The specimen exhibits a rhomboidal shape; white internal coloring; brown external coloring; no external sculpturing. The specimen measures between 100 - 120 mm in length and was assessed to be long dead when collected.
Date: unknown
Partner: Elm Fork Natural Heritage Museum

Potamilus purpuratus, Specimen #609

Description: One preserved mussel specimen including both the left and right valves. The specimen exhibits an oval shape; thick shell; pink internal coloring; dark brown external coloring; no external sculpturing. The specimen measures between 100 - 120 mm in length and was assessed to be recently dead when collected.
Date: December 4, 1971
Partner: Elm Fork Natural Heritage Museum

Potamilus purpuratus, Specimen #610

Description: One preserved mussel specimen including both the left and right valves. The specimen exhibits a rhomboidal shape; thick shell; pink internal coloring; dark brown external coloring; no external sculpturing. The specimen measures between 100 - 120 mm in length and was assessed to be recently dead when collected.
Date: unknown
Partner: Elm Fork Natural Heritage Museum

Potamilus purpuratus, Specimen #611

Description: One preserved mussel specimen including both the left and right valves. The specimen exhibits a rhomboidal shape; thick shell; pink internal coloring; dark brown external coloring; no external sculpturing. The specimen measures between 60 - 100 mm in length and was assessed to be recently dead when collected.
Date: unknown
Partner: Elm Fork Natural Heritage Museum

Potamilus purpuratus, Specimen #612

Description: One preserved mussel specimen including both the left and right valves. The specimen exhibits a rhomboidal shape; thick shell; pink internal coloring; black external coloring; no external sculpturing. The specimen measures between 60 - 100 mm in length and was assessed to be recently dead when collected.
Date: unknown
Partner: Elm Fork Natural Heritage Museum

Potamilus purpuratus, Specimen #705

Description: One preserved mussel specimen including the right valve only. The specimen exhibits an oval shape; thick shell; white internal coloring; dark brown external coloring; no external sculpturing. The specimen measures between 60 - 100 mm in length and was assessed to be very-long dead when collected.
Date: October 24, 1973
Creator: Pettit, J.
Partner: Elm Fork Natural Heritage Museum

Potamilus purpuratus, Specimen #702

Description: One preserved mussel specimen including the left valve only. The specimen exhibits an oval shape; thick shell; pink internal coloring; dark brown external coloring; no external sculpturing. The specimen measures over 120 mm in length and was assessed to be long dead when collected.
Date: October 24, 1973
Creator: Pettit, J.
Partner: Elm Fork Natural Heritage Museum

Potamilus purpuratus, Specimen #704

Description: One preserved mussel specimen including the right valve only. The specimen exhibits an oval shape; thick shell; white internal coloring; dark brown external coloring; no external sculpturing. The specimen measures between 0 - 60 mm in length and was assessed to be long dead when collected.
Date: October 24, 1973
Partner: Elm Fork Natural Heritage Museum

Uniomerus tetralasmus, Specimen #1235

Description: One preserved mussel specimen including the left valve only. The specimen exhibits an elliptical shape; thin shell; bluish-white internal coloring; brown external coloring; no external sculpturing. The specimen measures between 60 - 100 mm in length and was assessed to be very-long dead when collected.
Date: March 12, 1974
Creator: Pettit, J.
Partner: Elm Fork Natural Heritage Museum