PlaneSpottingWorld welcomes all new members! Please gives your ideas at the Terminal.

XV-4 Hummingbird

From PlaneSpottingWorld, for aviation fans everywhere
XV-4 Hummingbird
First prototype XV-4 Hummingbird
Manufacturer Lockheed
Maiden flight 7 July 1962
Status Retired
Primary user United States Army
Number built 2

The Lockheed XV-4 Hummingbird (originally designated VZ-10) was a U.S. Army project in the 1960s, one of many attempts to produce a V/STOL vertical take off / landing jet. At a design speed of 336 mph, the Hummingbird was slower than some propeller-powered transports.

The design used doors at the top and bottom of the fuselage intended to augment thrust ejected into this area with cold air. In theory, a 11,607 lb aircraft could be lifted by a 6,600 lbf engine. Unfortunately, performance was far below the estimates only 1.04 thrust-to-weight in practice and the prototype crashed on 10 June 1964, killing the pilot. The second aircraft was converted to lift jets instead, also crashing after several tests.

Rockwell's XFV-12 would be even less successful at venting cold air to augment thrust through the wings. The Lockheed F-35 Joint Strike Fighter would later employ a shaft-driven lift fan, also located in the fuselage and drawing on the lessons of the Hummingbird.

None of the early American V/STOL designs would result in a production plane. The British Hawker Siddeley Harrier used vectoring nozzles, while the Russian Yakovlev Yak-38 Forger attack jet used lift jets in conjunction with rotating rear nozzles.

Specifications (first prototype)

General characteristics


See also

Comparable aircraft

Related lists


Template:US Army VTOL Template:US STOL and VTOL aircraft

de:Lockheed VZ-10

This article is licensed under the GNU Free Documentation License.
It uses material from the Wikipedia article "XV-4 Hummingbird".