Boeing has had a long and successful history in the construction and aircraft production. Originally created as Pacific Aero Products Company, Boeing airliner Company was formed in 1917. As the company approaches its first century, it is appropriate to look back to one of the planes that Boeing put on the map . the model 40 This aircraft is the Boeing commercial aircraft more ancient. The Model 40 was used primarily as a postal transport, however, was also the first aircraft to transport passengers commercially Boeing.
oldest Boeing airliner


Boeing Model 40
On 7 April 1924, the U.S. Post Office solicited proposals for an airplane mail service to replace its fleet of aircraft , including the Curtiss JN-4H and Havilland DH-4, which had become their military settings. Boeing, along with 11 other manufacturers of planes , presented their designs on July 15, 1925. Presenting Boeing Model 40 biplane, fuselage had a wooden structure and wooden wings and fabric. I was driven by a 12-cylinder Liberty engine, 400 horsepower and that was cooled by water, as was required by the government in an effort to use the surplus war equipment. Boeing was unsuccessful, since the contract award corresponded to Douglas.

Boeing Model 40A
In early 1927, the U.S. Post Office began to deliver airmail service to private companies and, once more , requested proposals for various routes. Boeing dusted the model 40 and set out to redesign a winning tickets. The result was the Model 40A. This version had a fusalaje welded steel tube and a new Pratt & Whitney Wasp engine, 420 horsepower, air-cooled. The tubular steel structure reduced the weight and operating costs, while increasing the payload of the aircraft. This improvement, along with the Wasp engine light and reliable, helped Air Transport Boeing won the contract mail services.

Service history
The July 1, 1927, the first day of the new contract airmail Boeing 24 airplanes Boeing 40A completed service along the coveted contract airmail route 18, connecting San Francisco and Chicago. In addition to its ability to carry 1200 pounds (544 kilos) of mail, 40A model also had room for two passengers, becoming the first aircraft Boeing commercial passenger transport. The Model 40B became the production model primary , incorporating a motor more large Pratt & Whitney R-1690 Hornet. The Model 40B could carry four passengers and 500 pounds (226.8 kilos) of mail. In total, 77 models 40, including all variations were produced between 1925 and 1932.

Specifications Model 40A
The Boeing 40A model offered a wingspan of 44.17 feet (13.6 meters) and a length of 33.17 feet (10.1 meters). The gross weight of the aircraft was 6,000 pounds (2,721 kilos), providing 2469 lbs (1,119 kilos) of payload. The Model 40A had a maximum speed of 128 miles (206 kilometers) per hour, with a cruise of 105 miles (168.9 kilometers) per hour. The aircraft had a range of 650 miles (1,046 kilometers) and could operate up to a ceiling of 14,500 feet (4419 meters), although flying mail routes usually very close to the ground.