Following the test flying of a Doman-designed rotor on a modified Sikorsky R-6 designated the LZ-1A by Doman the company developed a five-seat helicopter to use the rotor. Little information is available on the LZ-2A other than it was developed into the larger eight-seat Doman LZ-4, the LZ-4 was the first helicopter designed completely by the company which indicates that the LZ-2A was perhaps a further development of the Sikorsky-based LZ-1. The LZ-2A Pelican was powered by a 245 hp 183 kW Franklin engine.
Following the test flying of the Doman LZ-2A, Doman Helicopters developed an eight-seat helicopter with the designation LZ-4. The fuselage had 3 rows of double seats in the main cabin and a two-crew flight deck in the front. Large folding doors allowed 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 helicopter was supported by a four-leg undercarriage.
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