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Wind-Tunnel Tests on Various Types of Dive Brakes Mounted in Proximity of the Leading Edge of the Wing

Date: May 1, 1949

Creator: Lattanzi, Bernardino

Description: The present report is concerned with a series of tests on a model airplane fitted with four types of dive flaps of various shapes, positions, and incidence located near the leading edge of the wing (from 5 to 20 percent of the wing chord). Tests were also made on a stub airfoil fitted with a ventral dive (located at 8 percent of the wing chord). The hinge moments of the dive flaps were measured.

Contributing Partner: UNT Libraries Government Documents Department

Permallink:digital.library.unt.edu/ark:/67531/metadc64509/

Wind-Tunnel Tests to Determine Aileron Characteristics of the McDonnell XFD-1 Airplane, TED No. NACA 23102

Date: September 26, 1946

Creator: Yates, Campbell C.

Description: Tests were performed on a partial span of the wing of a McDonnell XFD-1 airplane to determine a combination of sealed internal balance and spring-tab stiffness for the aileron that would give satisfactory stick-force characteristics for the airplane. Two sealed internal balances were tested in combination with spring tabs of various stiffnesses. One of the combinations was tested at several speeds to determine the variation of stick force with speed. Estimates, based on the results of the tests, indicate that for this airplane any reduction of stick force by use of the spring tab reduces the helix angle pb/2V below the required value of 0.09. The estimates show that, of the configurations tested, the most satisfactory combination for obtaining a stick force of 30 pounds at 300 miles per hour indicated airspeed is a 0.48-chord internal balance in combination with a spring-tab stiffness of 500 pounds per inch. With this combination, a wing-tip helix angle of 0.078 is estimated. Stick-force curves for all configurations show a rapid increase in stick force above approximately 20 deg. total aileron deflection.

Contributing Partner: UNT Libraries Government Documents Department

Permallink:digital.library.unt.edu/ark:/67531/metadc64186/

Wind-tunnel vibration tests of a four-blade single rotating pusher propeller

Date: June 1, 1943

Creator: Miller, Mason F

Description: None

Contributing Partner: UNT Libraries Government Documents Department

Permallink:digital.library.unt.edu/ark:/67531/metadc62132/

Wind-tunnel vibration tests of dual-rotating propellers

Date: September 1, 1943

Creator: Miller, Mason, F

Description: None

Contributing Partner: UNT Libraries Government Documents Department

Permallink:digital.library.unt.edu/ark:/67531/metadc62121/

Wind vane with various applications

Date: September 1, 1922

Creator: Constantin, M Louis

Description: A design for a wind vane is presented and various applications are discussed.

Contributing Partner: UNT Libraries Government Documents Department

Permallink:digital.library.unt.edu/ark:/67531/metadc55785/

Windmills in the light of modern research

Date: August 1, 1928

Creator: Betz, A

Description: The chief contribution of modern research in the field of windmills is a better understanding of the phenomena and of the available means for the accomplishment of certain results, but also of the natural limits to their productive capacity.

Contributing Partner: UNT Libraries Government Documents Department

Permallink:digital.library.unt.edu/ark:/67531/metadc65316/