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Stinson SM-2 / SM-7 / SM-8 / Junior
Stinson Aircraft had introduced their large high-winged six-seat SM-1 Detroiter in 1927. The SM-1 was sold successfully to airlines and other commercial operators, but it was too large to appeal to private owners.
1928 Stinson SM-2 Junior
Stinson therefore redesigned the aircraft with shorter span wings, shorter fuselage and a choice of less powerful engines as the SM-2 Junior. The aircraft was a strut-braced high-wing monoplane with a sturdy outrigger undercarriage which was braced against the wing support struts and the initial 110 h.p. Warner Scarab engine was normally left uncowled. The first SM-2 flew in mid-1928 and deliveries commenced that year. Later versions of the SM-2 had higher-powered engines of between 165 h.p. and 225 h.p.
The first of the Stinson “Junior” line, the SM-2, rolled off the Northville, Michigan factory floor in 1928. The airplane fuselage was welded chrome-moly steel tubing construction attached to a wooden wing structure with an overall fabric cover. Although designed to be used extensively for private use, with successive power increases, the aircraft became too big and heavy for the light plane class. They were put into service as air taxis and flight demonstrators. One of the early SM-2 models participated in the 1928 National Air Tour. Piloted by Randolph Page, the plane placed third in the tour. Later models of the Junior series would see many engine and dimensional changes.
1932 Stinson SM-8A Junior N408Y
The design was further developed to produce the more powerful and heavier SM-7 and SM-8 models which were full four-seaters and these were also used by commercial firms. The Junior R of 1932 had a deeper fuselage and a low-set stub wing to mount the undercarriage and wing struts.
The SM-8A, A.T. C. #295, equipped with a Lycoming R-680 9-cyclinder radial engine was introduced in April of 1930. The price was $5775. The low price tag paid off and by the end of 1930 there were more SM-8As sold then all other cabin airplanes put together. The airplane could cruise comfortably at 105 mph with a ceiling of 14,000 feet and a range of about 500 miles.
A total of 321 Stinson Juniors were built between 1928 and 1933, of which 27 survived in 2001 and several of these were airworthy in private hands.
 1929 Stinson SM-8A Junior


Engine: Warner Scarab 110 h.p.
Engine: Wright J6-5 165 h.p.
Engine: Wright J5 220 h.p.
Engine: Wright J6-7 225 h.p.
Length: 29 ft 0 in
Wingspan: 41 ft 8 in
Height: 8 ft 3 in
Wing area: 236 ft2
Empty weight: 2,169 lb
Gross weight: 3,229 lb
Maximum speed: 135 mph
Cruise speed: 113 mph
Range: 450 miles
Service ceiling: 22,000 ft
Rate of climb: 1,200 ft/min
Crew: 1
Capacity: 3 passengers
floatplane version of the SM-2AC
Engine: Wright J6-7 225 h.p.
Length: 29 ft 0 in
Wingspan: 41 ft 8 in
Height: 8 ft 3 in
Wing area: 236 ft2
Crew: 1
Capacity: 3 passengers
Engine: Wright J6-9 300 h.p.
Engine: Wasp Junior 300 h.p.
Engine: Lycoming R-680 215 h.p.
Wing Span: 41 ft. 6 in
Wing Area: 234 sq. ft
Airfoil: Clark Y
Length: 28 ft. 11 in
Height: 8 ft. 9 in
Empty Weight: 2061 lb
Gross Weight: 3195 lb
Useful Load: 1134 lb
Cruising Speed: 105 mph
Maximum Speed: 125 mph
Ceiling: 14,000 ft
Cruising Range: 500 mi
Price April 1930: $5775 at factory
Engine: Wright J6-7 225 h.p.
Engine: Packard DR-980 diesel 225 h.p.
Junior R 
deeper fuselage.
28 Units built
Engine: Lycoming R-680 215 h.p.
Junior R-2 
Engine: Lycomong R-680-BA 240 h.p. 3 Built.
Junior R-3 
as R-2 with retractable undercarriage 3 built.
Engine: Lycomong R-680-BA 240 h.p.
Junior R-3-S 
Engine: Lycoming R-680-6 245 h.p.
Junior S 
Engine: Lycoming R-680 215 h.p. with fully cowled engine
Junior W 
generally similar to the SM-7B
Engine: Wasp Junior

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