Dingwall (United Kingdom)

G.H. Dingwall & Son (Engineers) Ltd was a British company based in Dalston, London, that operated from 1892 until around 1949. Initially, the company specialized in the production of hand-propelled tricycles before venturing into motorized vehicles. In 1912, Dingwall created its first powered carriage by attaching a 1.5 hp Wall Autowheel to a hand-propelled tricycle, employing a cable mechanism that functioned similarly to a clutch.

The company introduced its first conventional motor tricycle in 1922, which featured a Villiers engine and a 2-speed gearbox. Over the next 16 years, the design of the motor tricycle underwent continuous improvements. By 1938, Dingwall reached a significant milestone with the launch of a fully enclosed motor tricycle, which was equipped with a streamlined body, windscreen, and hood, and powered by a 198cc Villiers engine. However, development of new models ceased with the onset of World War II.

In 1949, Dingwall announced a new three-wheeler that utilized a flat-twin Coventry-Climax engine and featured chain drive to a single rear wheel. This model was designed as a side-by-side two-seater, aiming to extend beyond the typical invalid car concept. A prototype was presented to the Minister of Health at the 1949 Invalid Tricycle Association Rally in Richmond Park, but it was deemed too costly for the National Health Service, leading to the cessation of Dingwall's operations.