1960s Italian gas generator aircraft engine
The Fiat 4700 was an Italian turbo-generator developed by Fiat Aviazione under contract to the Italian Defence Ministry and used to power the experimental Fiat 7002 tip jet helicopter.[1]
Design and development
The Fiat 4700 was developed to provide power in cold-jet driven helicopters.[1] The 4700 was a turbo-driven air compressor driven by the primary engine, a turbojet engine based on the Fiat 4002.[1] The compressor and primary engine are mechanically independent.[1] The engine is mounted vertically to reduce the length of the compressed-air ducts to the rotor.[1] The engine was used on the Fiat 7002 helicopter which first flew on 26 January 1961 where the Fiat 4700 was used to power the cold tip-jets on the two-blade rotor.[2]
Applications
Specification
Data from Jane's All the World's Aircraft 1962-63.[3]
General characteristics
- Type: Gas generator
- Length: 1,300 mm (51.2 in) (height)
- Diameter: 612 mm (24.1 in)
- Dry weight: 152 kg (335 lb)
Components
- Compressor: Single-sided centrifugal flow plus gas generator single-sided centrifugal flow compressor driven by the free power turbine
- Combustors: Annular with 16 burners
- Turbine: 1-stage axial flow (gas turbine power) + 1-stage axial flow free power turbine (gas generator power)
- Fuel type: Aviation kerosene
- Oil system: Re-circulating pressure system with one pressure pump and three scavenge pumps
See also
Comparable engines
Related lists
References
Notes