the next notable front-wheel drive race car was the supercharged Alvis 12/50 racing car designed by G. T. Smith-Clarke and W. M. Dunn, which was entered in the 1925 Kop Hill Climb in Princes Risborough in Buckinghamshire on 28 March 1925. Two months later (on Saturday, 30 May 1925), Harry Arminius Miller's Miller 122 front-wheel drive car was entered in the 1925 Indianapolis 500. Gallery of racing cars Alvis aircraft engines The initial Alvis aero-engines were licence-built Gnome-Rhone radials. The first aero-engine designed and built by Alvis was the 14-cylinder Alvis Pelides radial in 1936. Development of this and related engines (Pelides Major, Alcides, Alcides Major, Maeonides Major) was stopped with the start of the Second World War with only a handful built. The Alvis Leonides, a smaller 9-cylinder radial, continued in development during the war and was used after the war in some aircraft and helicopters until production finished in 1966. In 1952, Alvis returned to 14-cylinder radials with a development of the Leonides as the Leonides Major. The Major was used in the Westland Whirlwind helicopter. Alvis military vehicles The Hungarian automotive engineer Nicholas Straussler had designed an armoured car (AC1) in 1932, which was built by the Manfred Weiss company under licence in Budapest. When Hungary aligned itself with Germany soon afterwards, Straussler emigrated to England. Straussler's small new company, Straussler Mechanisations Ltd, lacked the necessary resources and capacity to build the vehicle on a large scale, so Straussler approached Alvis, and Alvis-Straussler Ltd, a short-lived joint venture company, was formed in July 1936. The prototype vehicle produced, the Alvis Straussler AC2, was built upon the AC1 chassis. The first AC3 – the first operational purpose-built armoured car ever produced – was delivered in 1937 by Alvis-Straussler Ltd, built upon the AC2 prototype. Twenty-seven vehicles were built: 12 for the Royal Air Force, 3 for the Portuguese Army, and 12 for the Royal Netherlands East Indies Army. The AC2 was subsequently used as a basis for the 39M Csaba armoured scout car built for the Royal Hungarian Army during the Second World War. Alvis-Straussler AC3 armoured car (Alvis-Straussler Ltd., 1937) Alvis-Straussler light medium tank (Alvis-Straussler Ltd., 1937) Hefty gun tractor (Alvis Mechanisation Ltd., 1937) LAC armoured car (Alvis Mechanisation Ltd., 1938) In 1938 Alvis Mechanisations was formed to take over the obligations of Alvis-Straussler Ltd. In 1938, Alvis produced a prototype armoured light reconnaissance vehicle for comparison