April 1, 1920

April 1, 1920

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The Lidgerwood Steam Balloon Winch

Directional Stability and Control of Airships

By Ralph H. Upson10 min

Flying an Airplane Engine on the Ground

By S. W. Sparrow9 min

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More Features
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 ot the balloon rope being broken due to sudden jerks.
200201

Directional Stability and Control of Airships

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.

By Ralph H. Upson10 min

194195

Flying an Airplane Engine on the Ground

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 littie aid in predicting performance with the reduced air pressures and temperatures met in flight.

By S. W. Sparrow9 min

190191

Recording Instrument for Use in Wind Tunnels

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.

By Albert A. Merrill8 min

192193

Stability and Balance in Airplanes

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.

By D. R. Husted6 min

192193

Determination of Altitude Records

As there has arisen a question as to the methods by which altitude records are calculated and the records of Major Schroeder and Roland Rohlfs are thereby given at different figures, which involves the question as to who holds the world’s record, AVIATION AND AERONAUTICAL ENGINEERING requested the technical staff of the Curtiss Aeroplane and Motor Corporation to give their understanding of the situation so that the whole matter would be better understood.
202203

Isotta-Fraschini Type V-6 Engine

The Isotta-Fraschini 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.
188189

Editorials

A brief notice appearing in this issue with regard to changes in the French air organization is worthy of interest. It shows that, having discontinued, after the Armistice, the sub-ministry of aeronautics for reasons of national economy, the French now see themselves forced to re-establish this office to prevent the collapse ef their aircraft industry.
204205

A Supply Means for Aircraft

A novel supply means for aircraft has recently been patented by Godfrey L. Cabot, of Boston, President of the Aero Club of New England. It is designed for use in collecting supplies, such as fuel and oil, food, sacks of mail or ammunition, by the airplane while in flight.
202203

Prevention of Dope Poisoning

Workmen who apply dope to wing fabrics find it difficult to avoid the occasional splashing of dope upon their hands. When protective gloves are not worn the dope dries upon the skin to a film that is removed only through the use of strong solvents.

By Lt. H. A. Gardner2 min

MARCH 151920 APRIL 151920