There was a Boeing Model 40B with the new Pratt and Whitney Hornet engines at 525 horsepower. Classy Classic Airplane.ĭo you know where i could find a set of construction drawings for the 40c plane to make a model? The skies over Cottage Grove was filled with the sound of that radial with long exaust pipes. I believe the pilot was the owner, and there is a fantastic web site. There was a beatiful 40 at the Cottage Grove, Oregon fly in August 2009. It's modeled after Addison Pemberton's 40C. July 2014- I am just beginning to build a flying model of the Boeing 40C with a wingspan of 89".It'll have a 1.20cu in. The first example of the Model 40A was flown initially on, and all 24 for Boeing Air Transport had been delivered in time for inauguration of the company's first air mail service on 1 July 1927.ġ x 313kW Pratt & Whitney Wasp radial piston engine A total of 25 was built, 24 for service with the new Boeing Air Transport Corporation, and one as an engine test-bed for Pratt & Whitney. 2, issued by the US Department of Commerce. for certification, the Model 40A gained Approved Type Certificate No. The cabin, and between the cabin and the engine firewall.īoeing was successful in its bid, being allocated the San Francisco-Chicago route, and was equally successful in gaining approval for its new aircraft. The pilot's position remained unchanged, but an enclosed cabin for two passengers was provided more or less directly over the lower wing, with cargo/mail compartments between the pilot's cockpit and The resulting Model 40A had three major changes by comparison with the original Model 40 prototype: the Liberty engine was replaced by a Pratt & Whitney Wasp radial its composite structure fuselage gave place to one of steel tube with fabric covering and better use was made of fuselage capacity. Requiring an aircraft to operate on any of the routes for which it might bid, Boeing dusted off the Model 40, and began a process of redesign and conversion to make it suitable for the sort of operation the company had in mind. This was to result in Boeing's design gathering factory dust for some 18 months until, in early 1927, the US Post Office began the process of turning the government air mail service over to private enterprise. First flown on 7 July 1925, the Model 40 was unsuccessful in the competition, the Douglas entry being declared winner. compartment in the forward fuselage, with the pilot seated well aft in an open cockpit. A fairly conventional biplane of that period, with tailskid landing gear and a Liberty engine, the Model 40 had a mail.
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It was required to compete against the submissions of other manufacturers, and the Post Office specification had stipulated the use of a Liberty engine, plus an ability to carry 454kg of air mail. To meet the requirements of the Air Mail Department of the US Post Office, which needed a new mailplane to replace its ageing DH-4s, Boeing designed in 1925 a large biplane transport under the designation Boeing Model 40.
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