In Partnership With

May 21, 1928

Etching of Aluminum Propellers

Fuselage Analysis

MANUFACTURERS’ SPECIFICATIONS ON AMERICAN COM AIRPLANES AND SEAPLANES AS COMPILED BY AVIATION

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Etching of Aluminum Propellers

ALUMINUM ALLOY propellers are subjected to a light etch, both in the process of manufacture and periodically when in use, for the purpose of detecting cracks or other defects that may be the cause of failures. The light etch, which should be distinguished from the deep etch used to reveal the structural features of the material, is accomplished by subjecting the surface of the metal to the action ot a caustic soda solution for a short period of time, rinsing in water, and then removing the deposit of copper which forms during the etching operation with a water solution of nitric acid, and finally washing and drying.

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Fuselage Analysis

Stress Analysis of Commercial Aircraft, Chapter Number Eleven

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MANUFACTURERS’ SPECIFICATIONS ON AMERICAN COM AIRPLANES AND SEAPLANES AS COMPILED BY AVIATION

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The Curtiss "Robin”

New Commercial Cabin Monoplane Powered with an OX-5 has a High Speed of 99.7 M.P.H. and Lands at 40 M.P.H.

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The Stearman Biplane

Models C-2B and C-2K were Designed for All-Around Service and Differ Only in Engine Installation

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The Hallett Aircraft Engine

WITH THE first unit of 50 engines contracted for and now in production for delivery within 60 days, the Hallett Manufacturing Co., Los Angeles, Calif., is definitely in the market with a new radial aircraft engine. The Hallett model H-526 is a seven cylinder, static radial, air cooled engine rated at 130 hp. when turning a maximum of 1800 r.p.m. The cruising speed is 1500 r.p.m., displacement is 526 cu. in., total weight 425 lb., bore 4⅜ in. and stroke 5 in.

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NEWS

Department of Commerce Makes Changes In Aircraft Engine Approval Requirements

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Last Minute Briefs

D. D. Johnson of West Hazleton, Penna., has been awarded the dealership of Lincoln-Page planes in 15 counties of Northeastern Pennsylvania. Johnson has purchased a Lincoln-Page from the United Air Transport, Inc., of Philadelphia, Pennsylvania and New Jersey distributor.
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Speeding Up Production in the Factory

OWING TO the newness of the industry, aircraft manufacturers have had to devise many appliances, peculiar to their needs, in order to speed up production. Three interesting devices have been constructed by the Alexander Aircraft Co. to be used in connection with glueing.

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NEWS

Newly Inaugurated New York-Atlanta Mail Line is Longest Ever Opened at One Time

May 141928 May 281928