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About Douglas M-2
Douglas M-2 Aircraft - photo wallpapers; Megawallpapers.org  :On April 17, 1926, Western Air Service, Inc.,

commenced operation on Contract Air Mail Route 4 (CAM-4) between Los Angeles

and Salt Lake City. via Las Vegas. For service over this route, a distance of

about 660 miles, Western selected the Douglas M-2 aircraft, a mailplane version

of the 0-2 observation plane produced by the Douglas Company to replace the

U.S. Army DH-4 aircraft. The Douglas M-2 was selected because it was far superior

in strength, construction, performance, and flying characteristics to other

aircraft entered in the Post Office Department’s competition for airmail

airplanes. The M-2 was a single-bay biplane with the conventional form of axleless

undercarriage. The fuselage, a truss of steel tubes and tie rods, was made in

two detachable sections. The engine section was detachable at the station at

the front wing beam and the engine cowling was hinged to facilitate inspection.

The fuselage aft of the firewall was covered with fabric. The wings, vertical

fin, and horizontal stabilizer were of standard wood beam and built-up rib construction,

with the elevators and rudder made of Duralumin tubing. The power plant was

a 400-hp, Liberty water-cooled engine, with nose radiator. Two main fuel tanks,

each of sixty gallons capacity and made of sheet aluminum, were so mounted in

the lower wing that they could be jettisoned by the pilot. A small 10-gallon

gravity tank was located in the upper wing. A design detail of particular interest was the location

and construction of the M-2 mail compartment. It was situated in front of the

pilots cockpit, sealed from the engine by a fireproof bulkhead, and lined with

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