Beginning around 1922, Irwin’s Irwin Aircraft Company of Watsonville, California designed and provided blueprints for small, single seat sport aircraft which were supposedly simple enough for enthusiastic amateurs to build. In 1925, it introduced its Meteormotor. In 1926, it was improved by using copper instead of iron for cylinder cooling fins. Although classified as a radial, it was actually two opposed twins at ninety degrees to each other. This engine powered the Irwin M-T-2 and C-C-1 aircraft.

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