With its flawless design, careful workmanship and the safety characteristics of a Stearman, the 4-D Jr Speed Mail also had beautiful proportions and flowing lines.
A high speed sport craft with good performance and a 600 lb. payload the 4-D had many practical uses.
The first 4-D was purchased by the Pratt and Whitney engine company and was used to tour the country and promote their new Junior Wasp engine.
The 4-D was also purchased by Western Air Express for the mail route and was the first Californian mail carrier. This model was later replaced by the 4-EM single seat mail cargo carrier.
Typical Chrome-Moly and fabric construction, this was the first production aircraft to take full advantage of the rather large, but streamlined NACA low drag engine cowling.
|DISPLAY STATUS||COUNTRY OF ORIGIN||CURRENT LOCATION|
|Own||United States||Legends Hangar|
|PURPOSE & TYPE||MATERIALS||ERA & DATE RANGE|
1918 – 1939
First Produced: 1930
Number Built: 8
Armament: NoneThis Jr Speed Mail was acquired by Yanks in August 1987 and is one of only two flyable today.
|Wingspan: 38’ upper, 28’ bottom
Wing Area: 307 sq ft
Empty Weight: 2,297 ft
Gross Weight: 3,800 ft
Powerplant: P.W. Wasp Jr.
Cruise Speed: 120 mph
Maximum Speed: 145 mph
Range: 720 miles
July 16, 1931