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The Piasecki X-49 "SpeedHawk" is an American four-bladed, twin-engined experimental high-speed compound helicopter developed by Piasecki Aircraft.The X-49A is based on the airframe of a Sikorsky YSH-60F Seahawk, but utilizes Piasecki's proprietary vectored thrust ducted propeller (VTDP) design and includes the addition of lifting wings.
A ducted propeller, also known as a Kort nozzle, is a marine propeller fitted with a non-rotating nozzle. It is used to improve the efficiency of the propeller and is especially used on heavily loaded propellers or propellers with limited diameter. It was developed first by Luigi Stipa (1931) and later by Ludwig Kort (1934). The Kort nozzle is ...
Emptying of air is done through four valves under the envelope. The valves open automatically as the ship climbs; air is released, the ballonets collapse and the helium expands. During descent, air from the propeller ducts, and/or electric fans is used to inflate the ballonets, and keep the envelope from collapsing.
In aeronautics, a ducted fan is a thrust-generating mechanical fan or propeller mounted within a cylindrical duct or shroud. Other terms include ducted propeller or shrouded propeller . [ 1 ] When used in vertical takeoff and landing ( VTOL ) applications it is also known as a shrouded rotor .
Bell X-14 (vectored thrust) Bell X-22 ; Bell XV-3 (first tiltrotor) Bell XV-15 (tiltrotor) Bensen B-10 (ducted fan) Boeing/McDonnell Douglas AV-8 Harrier (vectored thrust) Boeing-Vertol VZ-2 ; Boeing X-32B (vectored thrust) Boeing X-50 (stoppable-rotor gyrodyne UAV - failed to achieve forward flight) Boulton Paul P.137 VTOL research aircraft
Increased maneuverability, by adding a steerable nozzle to create vectored thrust; Noise reduction, resulting in a low sonar signature; this particular system has little in common with other pump-jet propulsors and is also known as "shrouded propeller configuration"; [3] [better source needed] applications:
1871 Planophore A Farman MF.11, showing the classic Farman configuration with engine between tail booms Buhl A-1 Autogyro, the first pusher autogyro The post-WWII Convair B-36 was unusual in its size, era, number of engines, and combining both propeller and jet propulsion, with six radial piston and four jet engines Typical of many UAVs, the General Atomics MQ-9 Reaper has a propeller at the ...
A lift jet is a lightweight jet engine used to provide vertical thrust for VTOL operation, and is then shut down in forward flight. Some VTOL designs, including the Soviet Yakovlev Yak-38 and Yakovlev Yak-141, have used both vectored thrust from the main engine and additional thrust from auxiliary lift jets.