Soloy Corp. re-engine Bell and Hiller helicopters. Beech Bonanza and Cessna 206, 207 and Caravan with various Allison 250 turbine engines.
SONEX LTD Company formed by John Monnett, designer of the Sonerai, Monerai and Moni light aircraft, to produce kits of his latest design, the Sonex, its Y-tailed Waiex and motor…
Hobart Sorrell built Dr. I (Fokker triplane) ¾-scale replica 1957. Subsequently formed Sorrell Aircraft Co. Ltd, flying SNS-2 Guppy biplane (1967), SNS-7 Hiperbipe aerobatic biplane (March 1973) and SNS-9 Exp…
Southern Aircraft Corp. formed 1939 at Garland, TX, producing BM-10 biplane trainer 1940. Subsequently contributed parts for large wartime programmes. Flying Automobile (1946) never certificated.
In September 1927 Mid-Continent Aircraft Co. at Tulsa, OK, taken over by group of investors, and Spartan Aircraft Co. formed 17 January 1928, building Spartan 3C-1 and various derived versions…
Specialized Aircraft Co. produced rebuild of DC-3 (3 x PT6); see Tri Turbo.
Spectrum Aircraft Corp. built light aircraft 1984.
Robert F. Kerans formed Spencer Amphibian Aircraft Inc., IL. See also Spencer.
P.H. Spencer, Pacoima, CA, pilot since 1914, designed Privateer (see Amphibions Inc.), Spencer-Larsens, Republic Seabees and Trident TR-1, all variations of basic Spencer Air Car configuration. This developed into S-12…
Formed 1937 by P.H. Spencer and V.A. Larsen (ex-Fokker, Standard and Sikorsky) to develop 2-seat amphibian with fuselage engine driving pylon-mounted pusher propeller.
Elmer Sperry’s son Lawrence formed Lawrence Sperry Aircraft Co. June 1919 at Farmingdale, Long Island. First product sport biplane with folding wings and 2 x BMW motor cycle engines each…
Tony and Dorothy Spezio, Bethany, OK, built DAL-1 Tuholer (2 May 1961) tandem open-cockpit sport aircraft; many plans sold, business continued (name unchanged) by William Edwards, Northampton, Massachusetts, from August…
Spirit One Corp. market plans of Spirit 1 ultralight.
Spitfire Helicopter Co. formed January 1975 to produce various marks of turbine-engined derivatives of Enstrom F-28A.
Sport Air Craft International, Hillsboro, Oregon, originally Chris Tena, market 2 versions of Mini Coupe.
Sport Aircraft Inc., Lancaster, CA, took over Sunderland and market plans of S-18, over 134 sets sold January 1992.
Sport Racer Inc., Valley Center, Kansas, sell plans for 230-mph 2-seat Sport Racer.
George Stark (see Stark) designed Sport-Aire side-by-side low-wing monoplane (9 November 1959); plans marketed.
Spratt & Co. Inc. formed at Media, PA, by George G. Spratt to build Model 107 flying-boat (April 1979) to test patented scheme in which only movable surfaces are separately…
St Louis Aircraft Corp. formed at that city 1928 as subsidiary (later division) of tram-builder St Louis Car Co. First product was Cardinal C2-60, side-by-side high-wing cabin monoplane with 65-hp…
Stabilaire Inc., Mass., produced supposed safe aircraft, unstallable, unspinnable, tested Portsmouth, New Hampshire, 1933 with 40-hp Szekeley, speed range 37-90 mph.
Wilbur Staib built Airy-Plane light aircraft 1966.
Standard Aircraft Corp. formed September 1916 at Plainfield, NJ, later adding plant at Elizabeth, NJ, in belief aircraft would be needed for war. Took over Sloane November 1916, building 3…
Star Aircraft Co. formed by Phillips Petroleum at Bartlesville, OK, 1928, modifying aircraft for fuel/lubricant research by parent, and for executive transport and publicity. By 1936 had produced 38 Cavalier…
Star Aviation, New Braunfels, TX, market kits (50+) for LoneStar sport helicopter (18 October 1990).
Star-Lite Aircraft formed San Antonio, TX, to market kits/plans of brilliant (many awards) SL-1 sport single-seater (17 May 1983). Ceased production 1990.
Starfire Aviation Inc., Buckeye, AZ, market kits and plans of Firebolt Convertible 2-seat aerobatic biplane (15 May 1987).
George Stark (of Salvay-Stark) gave his name to Sport Aire, prototype built by Al Trefethen and A. Thistle at Lomita. Later marketed as Sport-Aire.
Starling Aircraft Co. established May 1928 at Minneapolis to build Starling Biplane, conventional 3-seater.
States Aircraft Corp., Chicago Heights, built B-3 tandem parasol monoplanes during Depression (about 1930-32).
William H. Statler, Northridge, CA, markets plans of Firefly tandem-seat low-wing monoplane (8 October 1976).
STAUDACHER AIRCRAFT INC Aircraft of Staudacher design are now built by Wingtip to Wingtip LLC.
Lloyd Carlton Stearman, architectural student and naval cadet pilot, worked for E.M. Laird in Chicago, moved with him to Wichita and stayed after Laird’s return to Chicago, being appointed chief…
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