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The Square Four is a motorcycle produced by Ariel between 1931 and 1959, designed by Edward Turner, who devised the Square Four engine in 1928. At this time he was looking for work, showing drawings of his engine design to motorcycle manufacturers. [ 5 ]
When Ariel ended production of the Square Four the Healey brothers obtained a large assortment of spare parts, and in 1971 began production of the Healey 1000/4 at a small workshop in Bartlett Road, Redditch, close to the old Royal Enfield factory. The entire staff consisted of the two brothers, mechanic Paul Mayhew, and a secretary.
Ariel 4G & 4H: 1937–40 "Square" four-cylinder 995 cc Ariel VA 1940 500 C.C. Side Valve four stroke Ariel W/NG: 1940–45 350 cc (Military) Ariel KG & KH 1948 500 cc parallel twin, later versions called the "Fieldmaster" Ariel VB 1947–58 598 cc side-valve single, later models had alloy head Ariel Square Four Mark I: 1949–53 "Square" four ...
Ariel offered the twin in two models: the low-tuned KG and slightly higher-tuned KH. [11] In 1949 Ariel revised the Mark 1 Square Four engine to include a cast aluminium cylinder block and head in place of the cast iron components previously used, in an effort to promote cooling. With the lower weight the bike was a 90 mph (140 km/h) plus machine.
The 1931–1959 Ariel Square Four motorcycle used a four-cylinder engine (also called a 'square four' engine). The engine was compact and had as narrow a frontal area as a 500 cc, parallel twin. The rear pair of cylinders on this air-cooled engine were prone to overheating.
The idea for the engine was rejected by BSA, but adopted by Ariel. Thus it became the Ariel Square Four, and not the BSA Square Four. Turner was then invited by Jack Sangster to join Ariel. By 1929, at Ariel, Jack Sangster had Edward Turner and Bert Hopwood working under Val Page in design. [6] Turner, now 28, married Edith Webley. [citation ...
Ariel and Kfir are the only children left after an earlier deal in November 2023 that returned more than 100 of the 251 people Israel says were seized in the attack by Hamas fighters who killed ...
A square four is a U engine with two cylinders on each side. This configuration was used on the Ariel Square Four motorcycle from 1931 to 1959. This design was revived as a two-stroke version on some racing Suzuki models, and their subsequent road-going version the RG500. Although some racing success was achieved, the road bikes didn't sell in ...