May 4, 1925

May 4, 1925

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Stability and Controllability of Airplanes

By B. V. KORVIN-KROUKOVSKY14 min

UNITED STATES AIR FORCES

U. S. ARMY AIR SERVICE

The Economy of Air Cooling

By K. J. BOEDECKER8 min

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Stability and Controllability of Airplanes

Part V. Effect of Various Wing Arrangements

By B. V. KORVIN-KROUKOVSKY14 min

496497
UNITED STATES AIR FORCES

U. S. ARMY AIR SERVICE

Group Capt. M. G. Christie, Air Attaché of the British Embassy, Flight Lieutenant Soden and Flying Officer Lacey of the British Air Service, successfully accomplished live jumps from DeHaviland planes at a height of 2,000 ft. over Chanute Field recently.
492493

The Economy of Air Cooling

The air-cooled engine of the radial type is far superior to the water-cooled engine in the ease with which either a complete or a top overhaul may be made. Take the case of a top overhaul of the Wright Whirlwind (J series), 9 cylinder, 200 hp. air-cooled engine—this would mean the grinding of valves, removal of carbon, and possible renewal of piston rings or pistons—it can be done by one man, one cylinder at a time, between flights if necessary, without disturbing the timing or any other part of the engine and without removing the engine from the plane.

By K. J. BOEDECKER8 min

486487

The Elias Mailplane

Description of the Third Machine Built in Response to the Post Office Department’s Proposal for Bids
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Publisher’s News Letter

Publisher’s News Letter

Everyone knows that the principal source of revenue of any publication is from the advertising. In the case of trade papers it is supposed to come from the industry in which the paper circulates. With aeronautical papers a very odd situation exists.

By L. D. G.4 min

490491

More Details of the Loening Amphibian

484485
Editorials

Merchandise versus Passengers

494495
AIRPORTS AND AIRWAYS

Boston, Mass.

By Porter Adams3 min

494495
AIRPORTS AND AIRWAYS

Milwaukee, Wis.

By Daniel Kiser3 min

486487

What is the Value of Speed?

If an airplane can carry mail at the rate of 100 mi./hr. (which the U. S. Air Mail Service has demonstrated can be done) and if the best speed produced on a parallel railroad in the transmission of the same class of mail between two identical points, is 50 mi./hr. (the approximate average speed of the Twentieth Century Limited), what, if any, is the value of the coefficient “2”?

By THOMAS HART KENNEDY3 min

April 271925 May 111925