Siddeley-Deasy (Deasy Motor Company from 1906 to 1912) was a British automobile company based in Coventry in the early 20th century. It was founded by H.H.P. Deasy in the factory that had previously been used to manufacture Iden cars.
It changed its name from Deasy to Siddeley-Deasy when J D Siddeley joined the company from Wolseley and Deasy left following disagreement with his Chief Engineer. It merged with Armstrong-Whitworth who had been a suppier of castings to it in 1917 to form Armstrong-Siddeley.
Siddeley-Deasy grew rapidly using Rover chassis and Daimler and Aster engines. During World War I, Siddeley-Deasy grew to have 5,000 workers producing ambulances and aircraft engines. They were one of six companies to produce the Royal Aircraft Factory R.E.8 aircraft from 1916.
Much of the material on this website is copyrighted. Original articles appearing herein are subject to copyright. Please don't copy stuff from the site without asking; it may belong to someone! Any trademarks appearing on this site are the sole property of the registered owners. No endorsement by trademark owners is to be construed. The products, brand names, characters, related slogans and indicia are or may by claimed as trademarks of their respective owners. Every effort has been made whenever possible to credit the sources. The use of such material falls under the Fair Use provisions of intellectual property laws.