August 15, 1920

August 15, 1920

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Determination of the Resistance of Airship Models

By R. H. Smith19 min

The McCabe Sleeve

By I. E. McCabe13 min

Wind Tunnel and Airship Model Testing

By R. N. Wing11 min

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4445

Determination of the Resistance of Airship Models

Much of the early experimental work of consequence on the head resistance of airship models has been done on one or the other of two standard types of aerodynamic balances, the Eiffel or the bell-crank type. The Eiffel balance is of French origin and takes its name from the celebrated French experimenter, while the bell-crank type is probably of American origin, being used in this country since early in 1901.

By R. H. Smith19 min

6061

The McCabe Sleeve

The McCabe Sleeve is a wire rope fastener applied by the use of mechanical means only and has been developed chiefly for use on aircraft. It is made up without the use of solder with attending dangers from acids, fluxes and overheating and has working tolerances not difficult for the workman to maintain.

By I. E. McCabe13 min

5657

Wind Tunnel and Airship Model Testing

The information obtained from wind tunnel tests on models of complete airplanes, airships and their various parts has been of utmost value in the rapid development of aircraft during the last decade. The purpose of wind tunnel testing is to investigate the action of the air around bodies moving through it and to measure the resulting air forces or reactions upon these bodies under various conditions.

By R. N. Wing11 min

4849

Duralumin

The use of duralumin in the construction of aircraft makes an account of the properties of this material desirable especially with reference to its working qualities as developed by experience. Composition, Specific Gravity and Melting Point

By E. Unger,E. Schmidt8 min

6263

Hecter Fuel Compared with Export Aviation Gasoline

Aviation engine developments for attaining higher power at altitude are following two principal lines, supercharging and an increase in the compression ratio. For the latter, fuels have been demanded which are capable of operating under compressions too high for gasoline
5455

Note on Measurement of Speed of Airplanes

The writer was very much astonished to learn that in airplane speed trials over a measured course it was considered necessary to wait for a time when little or no wind was blowing, or, if any, that it had to be along the course. This restriction, of course, reduces considerably the available periods for making trials and, in fact, renders them impossible for days at a time.

By J. G. Coffin5 min

4243

Editorials

IS it not time there was a system of licensing aircraft in use in America? Now that the wartime ban is off civil flying there is nothing to prevent a person from putting his own and a number of other people’s lives and property in uncalled-for danger.
5859

Adjustable Camber and Variable Angle of Incidence

The following is presented as merely a tentative discussion of the possibilities of adjustable camber and variable angle of incidence. While the subject needs further investigation, it is thought that these remarks will arouse interest in the problem and possibly encourage aerodynamical investigation of the subject.

By Thomas P. Leaman4 min

5253

Model Test for Strength and Deformation of Non-Rigid Airship Hulls

Suppose the model filled with water of buoyancy in air— 1000 kg. per cu. m.—and the ship filled with hydrogen of a buoyancy equal to 1.1 kg. per cu. m. Suppose the model made of same fabric as the ship. deformation as the ship, that is, the model, when deformed, is geometrically similar to the deformed ship.

By Comdr. J. C. Hunsaker4 min

4849

N. A. C. A. Reports

RESULTS OF TESTS ON RADIATORS FOR AIRCRAFT ENGINES. Synopsis of Report No. 63, National Advisory Committee for Aeronautics. Part I shows in tables and curves the results of measurements of geometrical characteristics of 59 types of radiators, together with such physical properties as heat transfer, head resistance, air flow through the core, power absorbed, and figure of merit.
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