Colorado Firm Developing Hybrid-Electric UAV Engine. Combination gas-powered engine and electric motor developed for UAV. Published: 20-Sep-2010 LOUISVILLE – The University of Colorado has struck a deal it hopes will bring improved hybrid engine technology to aircraft, the University of Colorado Technology Transfer Office announced Tuesday. Tigon EnerTec Inc. is a startup that designs “eco-friendly” propulsion systems. It is working on a system that allows aircraft to use both traditional