U.S. Air Force awards Velontra Phase I hypersonic-propulsion contract - 2023-12-15 · Order / contract · The U.S. Air Force awarded Velontra a $109,484 Phase I STTR contract for a feasibility study on direct-connect testing of small air-breathing propulsion systems for reusable or attritable super- and hypersonic UAVs. - source: sbir.gov