Stinson introduced its revolutionary Detroiter in February 1926. The first ever enclosed passenger aircraft used by an airline (Northwest on 5 July 1927), and designed by Eddie Stinson. The Detroiter was named after the group of Detroit motor moguls who financed their building.
The Jr-S has solid spruce plank wing spars, routed to I-section, and a total of 36 wooden ribs. The wing also contains mild carbon steel drag tubes and steel drag wires. The ailerons span 9ft 8in and have a chord of 15.75in. They have steel frames, a 4130 tubular spar and nine metal ribs. The wing is braced by gin-chord lift struts. The struts have a streamlined shape formed with a 4130 steel tube and 11 mild steel stamped ribs in the forward struts, and 14 in the rear struts.
The fuselage is a conventional welded chromoly structure and has a nicely-upholstered cabin which is 8ft 3in long from the instrument panel to the rear bulkhead, and 40in wide across the front and rear seats. The height at the forward seats is 48in, and 46in at the rear. A 69 lb capacity baggage area is located aft of the rear seats. Dual control wheels are fitted, and the instrument panel layout is close to the original, although it now contains mostly modern instru-ments.
The tail surfaces have 4130 tubular steel frames with tubu-lar ribs, and the tailplane spans 13ft. The 31.5in high fin, which has a maximum chord of 34in, has two ribs. The rudder is 67in high, and has a 28in maximum chord and seven ribs. The tailplane's maximum chord is 31in, the elevator's 23.25in, and each has ten ribs. Ailerons and rudder are cable controlled, and push-pull tubes are used in the elevator. The tailplane can be adjusted by a centrally positioned lever in the cabin which activates push-pull tubes connected to a crank in the aft end of the fuselage.
The strut-braced main land-ing gear is made from chromoly tubes and employs a Stinson-designed oleo and spring hydraulic strut with 7in travel. The main tubular vees are streamlined with pine fairings and covered with Ceconite. Original Autofan wheels, with mechanical brakes, carry McCreary 8.50 x 10in tyres. Track is 9ft 6in. The tailwheel is again an Autofan, with a 5.00 x 4in tyre, and its wheel is installed on a fully castoring oleo strut. A small brake is attached to the outer cylinder to prevent shimmy.
The Jr-Shas a span of 41ft lin and a chord of 6ft 3in. Its overall length is 26ft 1lin, and height 8ft 9in. It weighs 2,300 lb empty and 3,2651 lb fully loaded. Its original fuel capacity was 60 US gal. The Jr-S's performance was similar to that of many other four-seaters of the early 1930s, but the type saw heavy service with small airlines, charter operators, and private owners.
The take-off run is 570 to 600ft at 50 mph with two aboard, or 1,000ft with four passengers. It climbs at 600ft/min at 65 mph with two, and cruises at 90 mph at 1,850 rpm (engine redline is 2,200 rpm). At cruising speed its fuel consumption is 13-14 US gal/hr, permitting a 5hr range with reserves.
In 1931 a Stinson Jr-S was factory priced at $5,775.
A Detroiter version of the Stinson Junior powered with a Packard diesel en-gine, held the world record for endurance without refueling.
Engine: Lycoming R-680 radial, 215 hp
Seats: 4. Cruise: 85 mph