The Doman LZ-5 was a utility helicopter developed in the United States in the early 1950s by Doman Helicopters Inc. of Danbury, Connecticut. Despite the procurement of international manufacturing agreements, no series production of the aircraft ever occurred, and only three prototypes were built. Two of these were purchased by the United States Army as the YH-31, but eventually becoming VH-31.
Development
Like the preceding
LZ-1 through
LZ-4, the LZ-5 utilized designer
Glidden Doman
Glidden Doman (January 28, 1921 – June 6, 2016) was an American aeronautical engineer and pioneer in helicopters and modern wind turbines. He founded one of America's original six helicopter companies (Doman Helicopters, Inc.) after making majo ...
's unorthodox gimbaled rotor head system, which featured the elimination of rotor hinges and dampers and included blades of soft-in-plane dynamic design. The servo control system was entirely contained within the rotor head, with no external oil tanks or plumbing. The tail rotor was also hingeless and free floating to eliminate stresses in rapid tail rotor turns. In other ways, it had a conventional helicopter main rotor and tail rotor configuration. The pilot and co-pilot were seated over the engine, which was in the nose, and a six-passenger compartment was located behind them. The engine was cooled by exhaust ejectors, producing an energy saving that increased payload by 800 pounds. The aircraft featured wheeled quadricycle undercarriage, the main units of which carried dual wheels.
The first prototype (registration ''N13458'') flew on 27 April 1953, and by the end of 1955, two machines had been delivered to the Army (''52-5779'' and ''52-5780''). Eventually, the Army concluded that they had no requirement for an additional piston-powered helicopter model in this size category, and no further order was placed. After extensive flight testing and pilot training by the Army, one of the prototypes was taken over by the Navy for a helicopter flight research program at the Patuxent River Naval Air Test Center. Later that aircraft was re-purchased by the Doman company and used in its commercial sales efforts.
Doman continued with development, building another LZ-5 aircraft in a joint venture with
Fleet
Fleet may refer to:
Vehicles
*Fishing fleet
*Naval fleet
*Fleet vehicles, a pool of motor vehicles
*Fleet Aircraft, the aircraft manufacturing company
Places
Canada
*Fleet, Alberta, Canada, a hamlet
England
* The Fleet Lagoon, at Chesil Beach, ...
in Canada. The LZ-5 helicopters were simultaneously Type Certificated in the U.S. and Canada in 1954. The third helicopter flew extensively in Canada under Canadian registration CF-IBG and in the United States, France, and Italy under U.S. registration N812. It flew in the Paris Air Show in 1960. This aircraft was also modified with the installation of full blind flight instrumentation, which was demonstrated extensively in the effort to sell it as a trainer. The aircraft thus equipped was advertised as the D-10. The planned production version would have been modified with a turbo-charged engine and designated as the D-10B. Doman sold production rights for military versions to
Hiller and for the Italian market to
Ambrosini.
Ultimately, none of these plans were to eventuate, and the LZ-5 never entered production.
Operational history
After the demise of Doman Helicopters Inc. in 1969, the second Army prototype was taken to California for display at the
Hiller Aviation Museum
The Hiller Aviation Museum is an aircraft history museum located at the San Carlos Airport in San Carlos, California. The museum was founded by Stanley Hiller in June 1998. and is endowed by members of the Hiller family. It specializes in North ...
, founded by
Stanley Hiller, Jr. That helicopter was returned to Connecticut in 2009 and is on display at the
New England Air Museum
The New England Air Museum (NEAM) is an American aerospace museum located adjacent to Bradley International Airport in Windsor Locks, Connecticut. The museum consists of three display hangars with additional storage and restoration hangars. Its c ...
in Windsor Locks, Connecticut.
Variants
* LZ-5 (3 built)
** YH-31 - LZ-5 for military evaluation, Army designated VH-31
* D-10B - Lycoming O-720 turbocharged engine; (proposed production version of LZ-5)
Specifications (LZ-5)
References
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{{USAF helicopters
LZ-5
1950s United States civil utility aircraft
1950s United States helicopters
Single-engined piston helicopters
Aircraft first flown in 1953