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Doman LZ-5 / YH-31 / D-10B helicopter

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Specifications Comment this helicopter
Picture LZ-5
General
Manufacturer Doman
Type LZ-5 / YH-31 / D-10B
Introduced 4/27/1953
In production? No
Units produced 3
Price US $ 0.00
Dimensions
Overall Length 40 ft
Length 0 ft
Height 10.24 ft
Width 0 ft
   
   
Description

The LZ-5 (aka YH-31 or D-10B) was a utility helicopter developed by the American Doman Helicopters company.

The LZ-5 began development after the completion of an international manufacturing agreement. However, no production series was ever forthcoming. Three prototypes were built in total.

The LZ-5 was not a major change from its predecessor the LZ-4. There were however quite a few detail changes and one major change in engine power. The LZ-5 uses a 400 horsepower supercharged Lycoming 580-D engine. This may not be that powerful by modern standards, but at the time this was a high figure. The engine was an eight-cylinder piston design, which was mounted beneath the pilot’s compartment.

The LZ-5 was a medium-sized aircraft with room for two crew and six passengers with luggage. It could also accommodate four stretchers when used as a medical transport.

Two of the three prototypes were delivered to the US Army with the designation YH-31. The army tested them for a time, but it was felt that the rotor system was too complex for practical field repair and so it was withdrawn from the Army inventory in 1958 after serving briefly as executive transports.

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Design features
  • Gimbal mounted rotorhead with propeller like blade pitch mechanism. No need for flap and drag hinges.
  • Non-retractable quadcycle landing gear
Description

The LZ-5 (aka YH-31 or D-10B) was a utility helicopter developed by the American Doman Helicopters company.

The LZ-5 began development after the completion of an international manufacturing agreement. However, no production series was ever forthcoming. Three prototypes were built in total.

The LZ-5 was not a major change from its predecessor the LZ-4. There were however quite a few detail changes and one major change in engine power. The LZ-5 uses a 400 horsepower supercharged Lycoming 580-D engine. This may not be that powerful by modern standards, but at the time this was a high figure. The engine was an eight-cylinder piston design, which was mounted beneath the pilot’s compartment.

The LZ-5 was a medium-sized aircraft with room for two crew and six passengers with luggage. It could also accommodate four stretchers when used as a medical transport.

Two of the three prototypes were delivered to the US Army with the designation YH-31. The army tested them for a time, but it was felt that the rotor system was too complex for practical field repair and so it was withdrawn from the Army inventory in 1958 after serving briefly as executive transports.

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Design features:
  • Gimbal mounted rotorhead with propeller like blade pitch mechanism. No need for flap and drag hinges.
  • Non-retractable quadcycle landing gear
Performance
Persons 8
Max. Range 244 mi
Cruise Speed 86 mph
Max. Speed 105 mph
Max. rate of Climb 1300 ft/min
HOGE ceiling 0 ft
Service Ceiling 18000 ft
Gross Weight 5210 lb
Empty Weigt 2859 lb
Useful Load 2351 lb
Dynamic system
Fuel Capacity 0 gallons
Number of Engines 1
Engine Type Piston
Engine Code Lycoming SO-580
Horse Power 400
Rotorhead Gimbal based rotor system
Number of rotorblades 4
Rotor Diameter 48 ft
Number of tail rotorblades 3
Tailrotor Diameter 0 ft
Blueprints & model
Manufacturer Website manufacturer..
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