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  Partner: UNT Libraries Government Documents Department
 Decade: 1940-1949
 Year: 1940
Boundary-Layer Transition on the N.A.C.A. 0012 and 23012 Airfoils in the 8-Foot High-Speed Wind Tunnel

Boundary-Layer Transition on the N.A.C.A. 0012 and 23012 Airfoils in the 8-Foot High-Speed Wind Tunnel

Date: January 1, 1940
Creator: Becker, John V
Description: None
Contributing Partner: UNT Libraries Government Documents Department
Boundary-Layer Transition on the N.A.C.A. 0012 and 23012 Airfoils in the 8-Foot High-Speed Wind Tunnel, Special Report

Boundary-Layer Transition on the N.A.C.A. 0012 and 23012 Airfoils in the 8-Foot High-Speed Wind Tunnel, Special Report

Date: January 1, 1940
Creator: Becker, John V.
Description: Determinations of boundary-layer transition on the NACA 0012 and 2301 airfoils were made in the 8-foot high-speed wind tunnel over a range of Reynolds Numbers from 1,600,000 to 16,800,000. The results are of particular significance as compared with flight tests and tests in wind tunnels of appreciable turbulence because of the extremely low turbulence in the high-speed tunnel. A comparison of the results obtained on NACA 0012 airfoils of 2-foot and 5-foot chord at the same Reynolds Number permitted an evaluation of the effect of compressibility on transition. The local skin friction along the surface of the NACA 0012 airfoil was measured at a Reynolds Number of 10,000,000. For all the lift coefficient at which tests were made, transition occurred in the region of estimated laminar separation at the low Reynolds Numbers and approach the point of minimum static pressure as a forward limit at the high Reynolds Numbers. The effect of compressibility on transition was slight. None of the usual parameters describing the local conditions in the boundary layer near the transition point served as an index for locating the transition point. As a consequence of the lower turbulence in the 8-foot high-speed tunnel, the transition points occurred consistently ...
Contributing Partner: UNT Libraries Government Documents Department
Breaking and training colts.

Breaking and training colts.

Date: 1940
Creator: Stamburgh, V. G. (Vivian Guy), 1885-; Williams, J. O. (John Oscar), 1885- & Krantz, Earl B. (Earl Beach), 1893-
Description: Describes methods training horses for farm use. Includes training or control methods for driving, riding, shoeing, and throwing.
Contributing Partner: UNT Libraries Government Documents Department
Buckling tests with a spar-rib grill

Buckling tests with a spar-rib grill

Date: September 1, 1940
Creator: Weinhold, Josef
Description: The present report deals with a comparison of mathematically and experimentally defined buckling loads of a spar-rib grill, on the assumption of constant spar section, and infinitely closely spaced ribs with rigidity symmetrical to the grill center. The loads are applied as equal bending moments at both spar ends, as compression in the line connecting the joints, and in the spar center line as the assumedly uniformly distributed spar weight.
Contributing Partner: UNT Libraries Government Documents Department
Business records for poultry keepers.

Business records for poultry keepers.

Date: 1940
Creator: Johnson, E. R. (Ernest Reuben), 1892-
Description: Describes business methods to help poultry keepers with their production and marketing issues, discusses record-keeping methods, and includes suggestions to improve efficiency of a farmer's poultry business.
Contributing Partner: UNT Libraries Government Documents Department
The calculated effect of various hydrodynamic and aerodynamic factors on the take-off of a large flying boat

The calculated effect of various hydrodynamic and aerodynamic factors on the take-off of a large flying boat

Date: January 1, 1940
Creator: Olson, R E & Allison, J M
Description: Report presents the results of an investigation made to determine the influence of various factors on the take-off performance of a hypothetical large flying boat by means of take-off calculations. The factors varied in the calculations were size of hull (load coefficient), wing setting, trim, deflection of flap, wing loading, aspect ratio, and parasite drag. The take-off times and distances were calculated to the stalling speeds and the performance above these speeds was separately studied to determine piloting technique for optimum take-off.
Contributing Partner: UNT Libraries Government Documents Department
Care and management of farm work horses.

Care and management of farm work horses.

Date: March 1940
Creator: Williams, J. O. (John Oscar), 1885-
Description: Describes how to successfully manage and care for work horses on the farm to maximize serviceability and profitability.
Contributing Partner: UNT Libraries Government Documents Department
Care and repair of mowers and binders.

Care and repair of mowers and binders.

Date: 1940
Creator: United States. Dept. of Agriculture.
Description: A guide to repairing and maintaining farm mowers and binders.
Contributing Partner: UNT Libraries Government Documents Department
Cattle-Fever Ticks and Methods of Eradication

Cattle-Fever Ticks and Methods of Eradication

Date: 1940
Creator: Ellenberger, W. P. & Chapin, Robert M.
Description: Revised edition. This bulletin discusses the cattle-fever tick and methods for controlling it. Possible methods include dipping, pasture rotation, and arsenical dips. The life history of the tick is also discussed and instructions for constructing a concrete vat are given.
Contributing Partner: UNT Libraries Government Documents Department
The cause of welding cracks in aircraft steels

The cause of welding cracks in aircraft steels

Date: October 1, 1940
Creator: Muller, J
Description: The discussion in this article refers to gas welding of thin-walled parts of up to about 3 mm thickness. It was proven that by restricting the sulphur, carbon, and phosphorous content, and by electric-furnace production of the steel, it was possible in a short time to remove this defect. Weld hardness - i.e., martensite formation and hardness of the overheated zone - has no connection with the tendency to weld-crack development. Si, Cr, Mo, or V content has no appreciable effect, while increased manganese content tends to reduce the crack susceptibility.
Contributing Partner: UNT Libraries Government Documents Department