unshrouded propeller
1Ducted fan — Bell X 22 on the tarmac A ducted fan is a propulsion arrangement whereby a fan, which is a type of propeller, is mounted within a cylindrical shroud or duct. The duct reduces losses in thrust from the tip vortices of the fan, and varying the… …
2Curtiss-Wright VZ-7 — VZ 7 Role VTOL utility aircraft National origin United States Manufacturer …
