Document Type: Technical Research Report Authority: Government Military (authoritative reference) Document Number: Technical Bulletin No. 30 [Air Service Information Circular (Aviation and Aerostation) Vol. IV, No. 380] (dated November, 1922).

Scope: Compilation report prepared by Engineering Division, Air Service, McCook Field. NB: The publication title was changed from "Technical Orders" to "Technical Bulletin" (at the request of the Chief of Air Service) in one of the first indications that the title of technical directives requiring compliance were going to be changed from "Letters of Instruction" to "Technical Orders."

Contents: Contains short but detailed summary information on all activities of the U.S. Army AIr Service Engineering Division, as well as a survey of developments in aeronautics and aviation writ large, especially military aviation.

Chapters include: - NEW DESIGN -- Airplanes on Engineering Division Program --- Fokker PW-6 Pursuit --views, description, and performance --- Fokker TW-4 Training --views, description, and performance --- Air Service Pulitzer Racers --regarding tests at McCook Field -- Balloons and Airships -- Engines -- Equipment --- Propaganda Distributors --test of Halsey and Pierce types. Photographic Trucks at Pulitzer Race, Selfridge Field, Mt. Clemens -- Investigation of Materials --- Test of Oil Used in Non-Stop Flight of "T-2" Transport - RESEARCH -- Resumé of Engineering Division Serial Reports - FOREIGN DEVELOPMENT -- New Farman A-2 Corps Observation Airplane (French) --views, description and performance - NEW BOOKS AND DOCUMENTS -- Latest Documents on Aeronautics

Related to aircraft engines, the report includes information on the following air-cooled types: Lawrance "T-2" and Wright "R-1" 350 h.p. 9-Cylinder; and the following water-cooled types: Almen "A-2" 375 h.p. 18-Cylinder; and superchargers.