Serial/Series Title
Year
Month
4 Matching Results
Results open in a new window/tab.
Results:
1 - 4 of
4
Propeller vibrations and the effect of the centrifugal force
A method has been devised for determining the frequencies of the various modes of a stationary propeller and the associated crankshaft. A method has also been devised to obtain the effect of the centrifugal force on a revolving propeller by use of a flexible model.
Date:
February 1935
Creator:
Theodorsen, T.
System:
The UNT Digital Library
The Aerodynamic Forces and Moments on a Spinning Model of the F4B-2 Airplane as Measured by the Spinning Balance
"The tests described in this report were made as part of an investigation of the spinning characteristics of the F4B-2 airplane conducted at the request of the Bureau of Aeronautics, Navy Department" (p. 1).
Date:
February 1935
Creator:
Bamber, M. J. & Zimmerman, C. H.
System:
The UNT Digital Library
Performance tests of a single-cylinder compression-ignition engine with a displacer piston
Engine performance was investigated using a rectangular displacer on the piston crown to cause a forced air flow in a vertical-disk combustion chamber of a single-cylinder, 4-stroke-cycle compression-ignition engine. The optimum air-flow area was determined first with the area concentrated at one end of the displacer and then with the area equally divided between two passages, one at each end of the displacer. Best performance was obtained with the two-passage air flow arranged to give a calculated maximum air-flow speed of 8 times the linear crank-pin speed. With the same fuel-spray formation as used without the air flow, the maximum clear exhaust brake mean effective pressure at 1,500 r.p.m. was increased from 90 to 115 pounds per square inch and the corresponding fuel consumption reduced from 0.46 to 0.43 pound per brake horsepower-hour. At 1,200 r.p.m., a maximum clear exhaust brake mean effective pressure of 120 pounds per square inch was obtained at a fuel consumption of 0.42 pound per brake horsepower-hour. At higher specific fuel consumption the brake mean effective pressure was still increasing rapidly.
Date:
February 1935
Creator:
Moore, C. S. & Foster, H. H.
System:
The UNT Digital Library
Vortex Noise From Rotating Cylindrical Rods
"A series of round rods of the some diameter were rotated individually about the mid-point of each rod. Vortices are shed from the rods when in motion, giving rise to the emission of sound. With the rotating system placed in the open air, the distribution of sound in space, the acoustical power output, and the spectral distribution have been studied. The frequency of emission of vortices from any point on the rod is given by the formula of von Karman" (p. 1).
Date:
February 1935
Creator:
Stowell, E. Z. & Deming, A. F.
System:
The UNT Digital Library