In 1952, the Agusta factory started building helicopters under licence to American manufacturer Bell. And aviation once again became fundamental to the Count's business. Although MV Agusta continued to sell small numbers of exotic road bikes, from this moment on racing was a hobby for Count Domenico. Helicopters made him a fortune, which he spent on racing. Aviation technology also served him well on the racetrack. His Grand Prix bikes were constructed using the same high-tech casting, forging and machining techniques used in the manufacture of his helicopters.