Lockheed XV-4B Hummingbird
In 1964, when the XV-4A proved unsatisfactory, the remaining Hummingbird was modified with four General Electric J85-GE-19 lift engines (3,000 lb thrust) for hover. Two additional J85 engines provided thrust during horizontal flight. During hover, large diverter valves directed the cruise engine exhaust on each side through the fuselage to a nozzle between the lift engines for additional vertical thrust. In transition, one lift/cruise engine was diverted, while the other provided forward thrust. Pitch and yaw jets at the nose and tail provided control in hover. Maximum vertical take-off weight was 12,600 lb. The Hummingbird II had a fly-by-wire dual channel autostabilization system. It was rolled out on 4 June 1968 but was destroyed in a crash during a conventional flight on 14 March 1969, without ever making a hover. Source: AHS V/STOL Wheel
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Lockheed XV-4B Hummingbird
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Lockheed XV-4B Hummingbird
This content is reserved for AHS members. If you are a current member, please use the Member Login link at the top of the page.
If you are not a member of AHS, why not join today? Be sure to also check out the many benefits enjoyed by AHS members.
Lockheed XV-4B Hummingbird
This content is reserved for AHS members. If you are a current member, please use the Member Login link at the top of the page.
If you are not a member of AHS, why not join today? Be sure to also check out the many benefits enjoyed by AHS members.
Lockheed XV-4B Hummingbird
This content is reserved for AHS members. If you are a current member, please use the Member Login link at the top of the page.
If you are not a member of AHS, why not join today? Be sure to also check out the many benefits enjoyed by AHS members.
Lockheed XV-4B Hummingbird
This content is reserved for AHS members. If you are a current member, please use the Member Login link at the top of the page.
If you are not a member of AHS, why not join today? Be sure to also check out the many benefits enjoyed by AHS members.
Lockheed XV-4B Hummingbird
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