Sikorsky’s Quest For A Hi-Speed Heli
Helicopters can perform amazing vertical feats, but their Achilles’ heel has always been forward speeds limited by the retreating blades’ ability to create lift. Usually, the machines max out at about 170 knots. Efforts to increase forward speed have previously resulted in degraded hover performance. While Bell inches its Bell/Agusta 609 tiltroter’s nacelles toward full […]