RACINE — DeltaHawk Engines, a Racine-based, privately held developer of general aviation engines, has announced investment from the Ruud family that gives them majority interest in the company.

OSHKOSH—Piper Aircraft has partnered with jet-fueled, diesel piston-engine maker DeltaHawk to give future buyers of PA-44 Seminoles a way to bypass the looming U.S. transition away from leaded avgas.

DeltaHawk, 2300 South St., which designs and manufactures engines for the aviation market, plans to hire more than 100 new assemblers and technicians in the next three to five years. The company will ...