Ariel Motors
Components Ltd. suffered several financial crises including spells in receivership in 1911 and in the early 1930s. In 1932, Components Ltd went bankrupt, and Jack Sangster, Charles Sangster's son, bought the Ariel subsidiary from the receivers at a bargain price. The company was renamed Ariel Motors (J.S.) Ltd, and promptly resumed production. A new factory was set up at Selly Oak in Birmingham. One of their first bikes was the Ariel Square Four, designed by Edward Turner, followed by the Ariel Red Hunter. The Red Hunter was a success, and enabled Ariel to purchase Triumph.
The Ariel Square Four, with a 500 cc engine designed by Edward Turner, was launched for the 1931 season. Around this time the company went into receivership and then a new company was formed. The Square Four displacement was increased to 600cc. Throughout their history, the Square Fours had overheating problems with the rear cylinders which resulted in distorted heads. A redesign in 1937[1] resulted in a 995cc OHV version designated the 4G.
From 1939, Anstey-link plunger rear suspension was an option. It was still available when production restarted in 1946, with a telescopic front fork superseding the girder fork.
During the Second World War the Ariel factory was turned over to military production, including the Ariel W/NG 350 army motorcycle based on the civilian NG model but with higher ground clearance frame inspired by that used successfully by Fred Povey in the ISDT.
In 1948 Ariel introduced a 500cc parallel-twin engine, following the trend that Triumph Engineering set with the Speed Twin and Tiger 100. Ariel offered the twin in two models: the low-tuned KG and slightly higher-tuned KH.[2]
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 plus machine.