The Ruud family, which sold its Sturtevant-based lighting business for $525 million in 2011, has acquired a controlling interest in DeltaHawk Engines Inc. and plans to boost the Racine company to produce diesel aviation engines for the commercial market. "Not only is the DeltaHawk engine an industry game-changer but it will also be impactful to our local community as we hire in anticipation of beginning production," said Christopher Ruud, son of Ruud Lighting founder Alan Ruud. With the investment...