CO-AXIAL HELICOPTER FROM SIKORSKY-BOEING COULD REPLACE ARMY’S CONVENTION HELICOPTERS “Defiant is designed to fly at nearly twice the speed and has twice the range of conventional helicopters while retaining the very best, if not better low-speed and hover performance of conventional helicopters,” A PUBLIC SOURCED ARTICLE FOR MATASII (SUBSCRIBERS-RESEARCH & PUBLIC ACCESS ) READERS  REFERENCE SII: DEFENSE […]