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Hi,
Founded in 1945 by Glidden J. Doman at Danbury, New York, to construct rotorcraft with hingeless rotorblades and
totally enclosed self-lubricating hub,and name changed in 1967 to Berlin-Doman Helicopters, recognising interests of
Chairman Dr Don R. Berlin.
As I notice that,the LZ means light or medium helicopter,and HC means helicopter & cargo,and already it was not
the series of D,some of these are only my speculations;
D-1 may it was the same as LZ-1,a modification of Sikorsky R-6 helicopter,1946
D-1A may was the same as LZ-1A,a two-seat helicopter,powered by one 175 hp Franklin engine,1948
D-2 may was the same as HC-1,a ten-seat large transport and cargo helicopter project,powered by two 450 hp
engines,1947
D-3 may was the same as HC-2,a ten-seat large transport and cargo helicopter project,powered by two 1200 hp
engines,1948
D-4 may was the same as L-2 Pelican,a five seat version of D-1,powered by one 245 hp Franklin engine,1949
D-5 may was the same as HC-3,a large cargo,transport and flying crane helicopter project,1949/50
D-6 may was the same as LZ-4,an eight seat transport helicopter,powered by one 400 hp Lycoming SO-580-B 8-cyl air-cooled horizontally-opposed piston engine,1952
D-7 may was the same as LZ-5,a ten-seat light transport helicopter,powered by one 400 hp Lycoming SO-580-B 8-cyl air-cooled horizontally-opposed piston engine,later became YH-31,1953
D-8 may was a three engines ASW large helicopter for Canada Competition,1954/55
D-8A may was another smaller helicopter for ASW Canada contest,1955
D-9 may was the same as FTH,a Fuel Tanker Helicopter for USAF,1955
D-10 may was the same as All Weather Instrumentation Helicopter 1955/56
D-10B was evolution of LZ-5,as 2-8 seat utility and cargo helicopter,with one 400 hp derated Lycoming
THIO-720-A1A engine,1958
D-10C was an improved version of D-10B,as a ten-seat helicopter,1960
D-11 was eight-seat observation helicopter,open skeletal version of LZ-5,1959
D-12 was a lightweight four-seat small helicopter,had estimated speed of 160 km/h,1959
D-13 may was the same as Kaiser-Doman KD-161,a two-seat light observation helicopter for LOH competition,1960
D-14 may was the same as Kaiser-Doman LOH,but a large version with four-seat,1960
D-15 may was a High Speed Helicopter,a small design for research,1961
BD-16 may a modernized version of LZ-5,mock-up only,1960s
BD-17 ----- -?
BD-18 may it was the same as BD-68,a ten-seat transport helicopter,powered by three 370 hp Allison T63-C14
engines
BD-19 was a nine-seat modern transport helicopter,powered by two 317 hp Allison Model 250-C18 engines
To be continued
Founded in 1945 by Glidden J. Doman at Danbury, New York, to construct rotorcraft with hingeless rotorblades and
totally enclosed self-lubricating hub,and name changed in 1967 to Berlin-Doman Helicopters, recognising interests of
Chairman Dr Don R. Berlin.
As I notice that,the LZ means light or medium helicopter,and HC means helicopter & cargo,and already it was not
the series of D,some of these are only my speculations;
D-1 may it was the same as LZ-1,a modification of Sikorsky R-6 helicopter,1946
D-1A may was the same as LZ-1A,a two-seat helicopter,powered by one 175 hp Franklin engine,1948
D-2 may was the same as HC-1,a ten-seat large transport and cargo helicopter project,powered by two 450 hp
engines,1947
D-3 may was the same as HC-2,a ten-seat large transport and cargo helicopter project,powered by two 1200 hp
engines,1948
D-4 may was the same as L-2 Pelican,a five seat version of D-1,powered by one 245 hp Franklin engine,1949
D-5 may was the same as HC-3,a large cargo,transport and flying crane helicopter project,1949/50
D-6 may was the same as LZ-4,an eight seat transport helicopter,powered by one 400 hp Lycoming SO-580-B 8-cyl air-cooled horizontally-opposed piston engine,1952
D-7 may was the same as LZ-5,a ten-seat light transport helicopter,powered by one 400 hp Lycoming SO-580-B 8-cyl air-cooled horizontally-opposed piston engine,later became YH-31,1953
D-8 may was a three engines ASW large helicopter for Canada Competition,1954/55
D-8A may was another smaller helicopter for ASW Canada contest,1955
D-9 may was the same as FTH,a Fuel Tanker Helicopter for USAF,1955
D-10 may was the same as All Weather Instrumentation Helicopter 1955/56
D-10B was evolution of LZ-5,as 2-8 seat utility and cargo helicopter,with one 400 hp derated Lycoming
THIO-720-A1A engine,1958
D-10C was an improved version of D-10B,as a ten-seat helicopter,1960
D-11 was eight-seat observation helicopter,open skeletal version of LZ-5,1959
D-12 was a lightweight four-seat small helicopter,had estimated speed of 160 km/h,1959
D-13 may was the same as Kaiser-Doman KD-161,a two-seat light observation helicopter for LOH competition,1960
D-14 may was the same as Kaiser-Doman LOH,but a large version with four-seat,1960
D-15 may was a High Speed Helicopter,a small design for research,1961
BD-16 may a modernized version of LZ-5,mock-up only,1960s
BD-17 ----- -?
BD-18 may it was the same as BD-68,a ten-seat transport helicopter,powered by three 370 hp Allison T63-C14
engines
BD-19 was a nine-seat modern transport helicopter,powered by two 317 hp Allison Model 250-C18 engines
To be continued
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