1920's American Aircraft
The Stearman M-2 Speedmail (nicknamed the Bull Stearman) was a mail-carrier aircraft produced by the Stearman Aircraft Company of Wichita, Kansas. It first flew in January 1929. The Speedmail was a single-seat biplane, with two large cargo compartments in place of a front cockpit. The fuselage and tail unit were constructed from welded chrome-moly steel tube faired with wooden formers and fabric covered aft of the pilot's cockpit, and detachable aluminium alloy panels covered the fuselage forward of the cockpit. The wings were constructed from spruce spars and plywood built-up ribs, all fabric covered. It differed from previous Stearman aircraft by having a tailwheel instead of a tailskid due to its size and weight.
Design and development.
Lloyd Stearman and Mac Short, (Stearman's V.P. engineering), designed the Speedmail to the requirements of Varney Air Lines, which needed a new mail carrier with greater capacity to fly the Air Mail contracts they acquired from the U.S. Postal service while still being able to land on short, unimproved airstrips. This was achieved by using a new type of airfoil section, the Goettingen 398, allowing high lift at low speeds without affect the cruising speed. The result was a sturdy aircraft with a large cargo capacity. 
To enable Interstate Air Lines to fly passengers on its Air Mail routes from Atlanta, Stearman enlarged the M-2, into the LT-1(Light Transport).The three aircraft produced for Interstate Air Lines could carry four passengers plus mail.
A further development was the CAB-1, "Stearman Coach", which was designed with an enclosed cabin for use as a business aircraft. However, only one was built.
Operational history.
Varney Air Lines' pilots found the M-2 difficult to handle and the Wright Cyclone engine was plagued with frequent maintenance issues. The sole surviving Stearman M-2 Speedmail is on display in the collection of the Western Antique Aeroplane &amp; Automobile Museum in Hood River, Oregon, U.S.A.
Specifications (M-2 Speedmail).
"Data from" Specifications of American Commercial AirplanesGeneral characteristics* Crew: 1* Capacity: payload* Aspect ratio: * Propellers: -bladed
Performance* Maximum speed: Mach * g limits: * Roll rate: * Maximum glide ratio: 
References.
Citations.
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