Boeing Monomail

The Boeing Model 200/221 mono Mail is a single-engine, designed for the postal and cargo transport aircraft, the aircraft manufacturer Boeing from the 1930s.

History

The mono Mail 200 ( a pure mail plane ) had its maiden flight on May 6, 1930 in Seattle with test pilot Edmund T. Allen at the wheel. Already on May 24, In 1930 the admission and transportation was established in November 1930 with the pattern of the experimental use recorded at Boeing Air. The model 221 mono Mail launched on 18 August 1930 and its first flight was on 16 September 1930, the approval. This model was 20 cm longer and had a six-seater passenger cabin with 4 windows and an entrance door on the left side of the fuselage. Both machines were later rebuilt with a passenger cabin for up to eight people. For this, the fuselage was extended by 69 cm. These machines were referred to as mono Mail 221A and flew for United on the track Cheyenne Chicago. Since the drive system was not yet fully developed ( no variable pitch propeller), only these two machines were built and Boeing focused on the next generation of aircraft with two engines. Both machines were lost over time. The first crashed near Glendo, Wyoming, the second on December 31, 1935 in Pueblo, Colorado on May 27, 1935.

Specifications

The Mono mail was a very advanced aircraft for its time. She was a fabricated semi-monocoque construction low-wing monoplane with duralumin longitudinal beams and additional stiffeners. The cantilevered, clad with smooth metal wing, in the center section two fuel tanks and landing gear bays contained, went to the wing root with an aerodynamically shaped fairing the hull over. The three-part, accessible from above the cargo hold was located directly behind the engine and had a total volume of 6.16 m³.