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
 Transport Steel Golden Age
1918 – 1939
PRODUCTION &
ACQUISITION
SPECIFICATIONS SERVICE HISTORY
MFG: Stearman
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
Length: 26’11”
Height: 10’2”
Empty Weight: 2,297 ft
Gross Weight: 3,800 ft
Powerplant: P.W. Wasp Jr.
Thrust:
Cruise Speed: 120 mph
Maximum Speed: 145 mph
Range: 720 miles
Delivered:

July 16, 1931