In the early 1980s a programme was commenced in Moscow to develop a high performance aerobatic aircraft for competition.

Thomas Stoddard commenced development of a light aircraft in 1975 and set up a facility at the Cedar Grove Airport in Seattle.

The 2/3 Spitfire, as it was initially known, has been produced by the Supermarine Aircraft Factory at Archerfield, QLD and was a fairly new foray into producing scale replicas of well known warbirds in Australasia.

A further design by the Stoddard Hamilton organisation at Arlington, Washington, like the Glasair the GlaStar is produced in kit form and has become very popular, providing good performance on the power available.

The Channel was built by the Supermarine Aviation Works Ltd at its Woolston facility at Southampton.

The GlaStar Sportsman, as it was initially known, has been described as the ideal small family, STOL go anywhere aeroplane.

The S-5 was one of a series of racing aircraft designed by R J Mitchell (designer of the Spitfire) in the 1920s, this aircraft being designed and built for the 1927 Schneider Trophy Race to replace the S-4 which crashed during trials.

The Stolp SA-100 Starduster was designed by Louis Stolp in the United States as a single-seat light sporting biplane and was aimed at the popular sport aviation market in America at that time.

The Starduster Too was designed by Louis Stolp and George Adamas for cross-country flying with an open cockpit and has been marketed by the Stolp Starduster Corp of Oroville, California, as a open sports plane for the amateur constructor.

In about 1932 an unusual aircraft was designed by Italy in Mr Luigi Stipa and built by Caproni, at one stage being claimed to be the first Italian jet-aircraft to fly.

The SA-500, sometimes known as the Starlet, or the Sprite, is built and marketed by Stolp Starduster Corp in Oroville, California.

Mr Lamar Steen designed the Skybolt with simplicity of construction as the main aim. A two-seat fully-aerobatic biplane, it was designed to be constructed by amateur constructors.

Squadron Aviation in Ohio in the United States produced a number of scale replicas of World War I fighters, including the Spad XIII, Fokker D-VII and the RAF SE-5a.

Stemme GmbH & Co of Strausberg was formed in 1985 (in Berlin) to develop high performance gliders, and the prototype S-10 (D-KKST) was flown for the first time on 6 July 1986.

In the 1930s David Staig, an automobile engineer from Surrey Hills in Melbourne, obtained a pilots licence and decided to build his own aircraft.

The Akro was designed by Mr C L Stephens in the USA specifically for amateur constructors who wished to take part in competitive aerobatics.

The Stampe series of tandem two-seat primary training biplanes was designed by Count Stampe in Belgium, and manufactured by the Stampe-et-Vertongen concern in Belgium.

The Sea Hawk was designed by Mr J Stevens in Queensland for the ultra-light amateur-built market and is the culmination of a number of designs he has produced and built over the years.

The Sunbird was a motor glider or self-launched glider designed and constructed in New Zealand by Charles Stanton over a three year period from 1993, the machine utilising some parts from the American Eaglet ZK-GOE (c/n AACA/641) which Mr Stanton had previously owned.

The Stewart S-51D is a 70-percent scale replica of the North American P-51D Mustang fighter aircraft of World War II and was introduced to the market in 1994 as a fully-aerobatic, high performance, accurate reproduction of the P-51D Mustang.

The GyroBee was designed by Ralph Taggart of the Michigan State University and made available as free documentation to interested builders, and in due course was produced in kit form by Star Bee Gyro of Worcester, Massachusetts for amateur builders.

The Model 105, also known initially as the HW-75, was introduced to the range of aircraft produced by the Stinson Aircraft Division of the Aviation Manufacturing Corporation in April 1939.

The Lonestar is a single-seat basic utility helicopter of all-metal construction marketed by Star Aviation Inc of New Braunfels in Texas, and is fitted with a 82-kw (110-hp) Hirth engine driving, via a chain, a composite main rotor.

Edward Stinson in 1926 formed Stinson aircraft with a facility at Willow Run in Detroit to build aircraft.

The Starfire Firebolt, a two-seat high-performance aerobatic biplane, also known as the Starfire Firebolt Convertible [convertible because the cockpit canopy can be quickly removed] and the MacKenzie Skybolt, was designed by G H McKenzie and was produced by Starfire Aviation of Tempe, Arizona and was produced in small numbers, nine

The L-5 Sentinel was developed from the Stinson Voyager light touring monoplane and, when compared, the Sentinel had more power and a strengthened airframe to enable it to be flown in the role of air-observation post under combat conditions.

Built in Brazil in South America, the Starfox V6 Super is one of a number of light aircraft produced for the light aircraft market and more than 2,300 examples are said to have been built.

The Stinson Model A first appeared in 1934 and was advertised as “Americas fastest and most economical Tri-Motor” and was built to compete against the Boeing 247and the Douglas DC-2, but was less costly to purchase and operate, and had better short-field ability.

The Sea Eagle was designed and built by William “Bill” Starke of Townsville, QLD and was flown by him in the initial performance trials.

As well as developing the tri-motor Model A, Stinson Aircraft was also working in 1933 on the SR Reliant series of light passenger monoplanes.

The Starlite is a single-seat light sports aircraft designed by Mark Brown (who also designed the Aero Design Pulsar).

Produced as a successor to the Simmonds Spartan, between 1930 and 1935 Spartan Aircraft Ltd constructed a total of twenty-six examples of its Three-Seater, the first two being completed at Southampton, and the remainder at the company’s new facility at East Cowes on the Isle of Wight.

The SP-30 is a two-seat light sporting and training aircraft manufactured in Russia by Spectr Aero and is described as an upgrade and development of the Zenair CH-701 aircraft series with changes aimed at improving its performance and ability to meet requirements in the light-aviation field in Russia.

In 1919 Sopwith Aviation and Engineering Co Ltd produced the Dove, this being a two/three-seat variant of the Sopwith Pup fighter of World War I converted for use as a private touring and training aircraft.

Designed and developed in Canada by Spectrum, the Beaver is a strut-braced high-wing monoplane of aluminium tube construction with double surface Dacron covering, and with a Mylar reinforced leading edge.

The Gnu was introduced in 1919 by the Sopwith Aviation Co of Canbury Park Road, Kingston-on-Thames, as a three-seat touring biplane or taxi aircraft with an enclosed cabin for the two passengers, although the enclosed cabin was found to be very cramped and was not popular and most were operated

The Spencer Air Car, also known as the Amphibian Air Car, was designed by Mr P H Spencer as a four-seat amphibian bearing a strong resemblance to the Republic Seabee, which he also designed.

The Wallaby, which was based on the Sopwith B.1 Bomber, was similar to the Sopwith Atlantic, which had been used by Harry Hawker in an unsuccessful trans-Atlantic attempt.

In 1957 Mr Tony Spezio commenced design of a two-seat light sporting aircraft that reminded him of some of the racing aircraft that were seen around the airshow circuit in the United States in the 1930s, particularly the Howard Ike.

Sorrell Aviation in the United States produced a series of ultralight aircraft, including the Guppy and the Hiperlight.