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Doman LZ-4



After the LZ-2A Pelican, Doman's system was designed into a larger helicopter that was seen as a viable commercial production machine. The LZ-4A had a large fuselage with three rows of double seats in the main cabin and a two-crew flight deck in front. Large folding doors provided access for loading bulky cargo into the main compartment. The tail boom was conventional with a cranked-up rear section mounting a tail rotor, and the LZ-4A sat on a four-leg undercarriage with trailing link dampers. A 400hp Lycoming SO-590-B engine was positioned in the lower nose, driving the four-blade rotor via a flexible transmission. Following its first flight in November 1950, and subsequent testing, Doman moved on to the improved LZ-5 and transferred the LZ-4A (N74147) to Curtiss Wright, where it was given the designation of CW-40, as a test vehicle. The LZ-4's first flew in November 1950.


Number of seats: 8
Engine: 1 x Lycoming SO-590-B, 400hp
Rotor diameter: 14.64m
Length: 11.7m
Height: 3.41m
Gross weight: 2165kg
Empty weight: 1343kg
Cruising speed: 125km/h
Rate of climb: 244m/min
Absolute ceiling: 4880m
Range: 336km

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