September 21, 1929

The 1929 Schneider Trophy Contest

Some Aspects of the Graf Zeppelin's Flight Aroun the World

The Operation of Thompson Aeronautical Corp. Lines


The 1929 Schneider Trophy Contest

THE GREAT QUESTION here at Calshot, before the race is the maximum speed of the two new British defenders of the Schneider Trophy. While the secret is being carefully guarded, I can hazard a guess that if every anticipation is realized aircraft speeds may be raised to 360 m.p.h. over the standard three-kilometer course.


Some Aspects of the Graf Zeppelin's Flight Aroun the World

THE HEARST-ZEPPELIN globe encircling flight established several records not likely to be broken for some time to come. The airship was not designed or built to engage in speed contests, but its record flight from Lakehurst to Friedrichshafen compares so favorably with other records that even the officers on board were astounded.


The Operation of Thompson Aeronautical Corp. Lines

SINCE ORGANIZATION of the company in 1927 Thompson Aeronautical Corporation has become the fourth largest air mail operator in the United States in point of miles flown daily. Although the company probably has more small town stops than any other operator in the nation, it also serves the second, fourth and fifth largest cities in the country, i.e., Chicago, Detroit and Cleveland.

Aeronautical Engineering Section

Heat Flow in Aircraft Engine Pistons

THE subject of heat flow in the pistons of high performance internal combustion engines is of great importance since it largely controls piston temperature. The piston temperature, in turn, is an important factor affecting not only the strength and life of the piston itself, but also such essential characteristics as the maximum compression ratio which may be used with a given fuel and the extent of the cyclic heat losses, friction losses, etc. It is therefore evident that considerations of heat flow should be given an important place in piston design.

Aeronautical Engineering Section

Notes on the Design of the N.A.C.A. Cowling

THE N.A.C.A. type cowling has been applied to many types of aircraft using radial air cooled engines, with varied success. In some installations, the modifications which were made to the N.A.C.A. cowling resulted in lowering the cowling efficiency, and in improper engine cooling.


Gliding Activities at the National Air Races

AMONG the several new trends in American aeronautics displayed before the 400,000 or more persons attending the recent National Air Races in Cleveland, few were more thoroughly novel to a majority of the spectators than was the long-shelved sport of motorless flight.

Engine Service From Coast to Coast

FULLY REALIZING that increased sales are best attained by giving 100 per cent service to the consumer, the Kinner Airplane and Motor Corporation of Glendale, Calif., manufacturer of the Kinner K-5 100 hp. aircooled radial engine, is now establishing a service organization which will place every Kinner powered plane in the country within easy access of expert service.

Aeronautical Engineering Section

Analysis of the Wing and Other Indeterminate Structures

IN THE last article we gave a method for computing the loads in the spars of a wing considered as an indeterminate structure. We calculated the reactions of the compression members on the spars and found the true value of their bending moment.


Airport Construction Projects

Leonard Macomber, Inc., airport engineers and builders, has been retained to construct the Muncie (Ind.) Municipal Airport, recently presented to the city by Abbott L. Johnson, president of the Muncie Airport Commission. The first 160-acre tract is expected to be ready for flying operations in the early spring.
Aeronautical Engineering Section

An Approximate Expression for Airfoil Profile Drag

IN AN article “Design Your Own Airfoils,” by the writer, published in the October 25, 1927, issue of AVIATION, data was furnished to enable the engineer to design an airfoil to meet the particular phases of his problem by giving proper spar depth, maximum lift and minimum drag for the régime of lift coefficient in which he was particularly interested.

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