April 1, 1920

The Lidgerwood Steam Balloon Winch

Directional Stability and Control of Airships

Flying An Airplane Engine on the Ground

204205

The Lidgerwood Steam Balloon Winch

The Lidgerwood Manufacturing Co. has constructed a special steam driven balloon winch and leading blocks for the handling of captive kite balloons on shipboard, with the object in view of reducing to a minimum the possibility of the balloon rope being broken due to sudden jerks.
200201

Directional Stability and Control of Airships

Chief Aeronautical Engineer, Goodyear Tire and Rubber Co. Much work remains to be done to complete a study of this rather intricate subject. We need more experimental evidence with a wind tunnel, and more particularly with a whirling arm, to determine quantitative values which will be general enough for purposes of new design.

194195

Flying An Airplane Engine on the Ground

Associate Engineer, Bureau of Standards, Washington In the early part of the war there was much dissatisfaction with the existing methods of testing airplane engines. The very complete laboratory tests made at ground level were of little aid in predicting performance with the reduced air pressures and temperatures met in flight.

190191

Recording Instrument for Use in Wind Tunnels

Throop College, Pasadena, Calif. The primary object of experiments in a wind tunnel is to obtain the magnitude of a force acting on a model, which force is produced by air moving through the tunnel at some known speed. The magnitude of the force is found by means of a special instrument called an aerodynamical balance and the speed of the air is measured by means of an alcohol manometer, generally of the Krell type, which is connected to a static pressure plate on one side of the tunnel.

192193

Stability and Balance in Airplanes

Curtiss Research Laboratories * In the design of airplanes it has been found to be quite possible accurately to estimate performance from data based on tunnel tests of the various individual parts. Performance in this sense means power requirements for various speeds, climb and landing speeds.

192193

Determination of Altitude Records

202203

Isotta-Fraschini Type V-6 Engine

The Isotta-Frasehini type V-6 is a four-stroke vertical six-cylinder water-cooled engine which is rated 250 hp. and develops about 260 hp. at a normal engine speed of 1,650 r.p.m. and about 275 hp. at 1,850 r.p.m. The engine weighs in running order, including the propeller boss, but excluding radiator, water, oil and exhaust tubes, 278 kg.

204205

A Supply Means for Aircraft

202203

Prevention of Dope Poisoning

194195

Book Review

HANDBOOK OF MODERN AERONAUTICS. By Arthur W. Judge. (With 345 illustrations and about 350 tables. D. Appleton and Co.) Aeronautical people have long felt the need of a good handbook, and Mr. Judge’s work will undoubtedly do a great deal to satisfy this need. The book is excellently printed and arranged.
March 151920 April 151920