In April 1928, the first of the Junior series rolled of the assembly line at Stinson Aircraft Corporation's Detroit factory. The SM-2, designed by William Naylor, was the first of a long line of Juniors built by Stinson from 1928 to 1931. While designed for private use, many Juniors were used in air taxi service and the first models placed nationally in various flying contests. During the four-year period production period, the Junior underwent several modifications and design changes. From the SM-2 models, the Junior evolved into the SM-2AB, SM-2AC (seaplane), SM-7B, SM-8A and S models to name a few, utilizing powerplants as varied as a 100-hp Kinner to a 300-hp Pratt & Whitney Wasps.
In 1929, Stinson merged with the Lycoming Motor Company owned by Erret Lobban Cord. From that point, most of the Stinson aircraft, including the SM-8A and S Juniors, utilized the R-680 radial engine. For the SM-8A and S series, the reliable R-680 proved to be a perfect match.
About 113 S Juniors were produced by Stinson in 1931.

SPECIFICATIONS

MANUFACTURER: Stinson Aircraft Corporation.

ENGINE: Lycoming R-680
Nine cylinder radial
215 horsepower.

WINGSPAN: 41' 6 1/4".

LENGTH: 28' 8 3/8".

HEIGHT:8' 9".

GROSS WEIGHT:3,265 lbs.

CRUISE SPEED: 100 m.p.h.

MAXIMUM SPEED: 128 m.p.h.

CEILING: 13,500 ft.

RANGE: 400 miles.

CREW: One.

FACTORY PRICE (1931): $4,995.

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