Fiat 4700
{{short description|1960s Italian gas generator aircraft engine}}
| {{Infobox aircraft begin
|name= 4700 |image = |caption = }} {{Infobox Aircraft Engine |type= |national origin = Italy |manufacturer= Fiat Aviazione |first run=1960 |major applications= Fiat 7002 |number built = |program cost = |unit cost = |developed from = Fiat 4002 |developed into = |variants with their own articles = }} |
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.
Design and development
The Fiat 4700 was developed to provide power in cold-jet driven helicopters. The 4700 was a turbo-driven air compressor driven by the primary engine, a turbojet engine based on the Fiat 4002. The compressor and primary engine are mechanically independent. The engine is mounted vertically to reduce the length of the compressed-air ducts to the rotor. 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.
Applications
Specification
{{jetspecs
|ref=Jane's All the World's Aircraft 1962-63.{{cite book|last=Taylor|first=John W.R. FRHistS. ARAeS|title=Jane's All the World's Aircraft 1962-63|year=1962|publisher=Sampson, Low, Marston & Co Ltd|location=London}}
|type=Gas generator
|length={{convert|1300|mm|in|abbr=on|1}} (height)
|diameter={{convert|612|mm|in|abbr=on|1}}
|weight={{convert|152|kg|lb|abbr=on}}
|compressor=Single-sided centrifugal flow plus gas generator single-sided centrifugal flow compressor driven by the free power turbine
|combustion=Annular with 16 burners
|turbine=1-stage axial flow (gas turbine power) + 1-stage axial flow free power turbine (gas generator power)
|fueltype=Aviation kerosene
|oilsystem=Re-circulating pressure system with one pressure pump and three scavenge pumps
|power={{convert|610|hp|kW|abbr=on|disp=flip}} (gas hp for take-off), {{convert|505|hp|kW|abbr=on|disp=flip}} (ghp max continuous)
|thrust=
|compression=4:1
|bypass=
|aircon={{convert|5.1|kg/s|lb/s|abbr=on|1}} at 25,000 rpm at sea level, {{convert|7.36|lb/s|kg/s|abbr=on|order=flip}} (max continuous)
|turbinetemp=
|fuelcon=
|specfuelcon={{cvt|0.758|kg/kWh|lb/hph}}
|power/weight= {{cvt|2.99|kW/kg|hp/lb}}
|thrust/weight=
}}
See also
{{aircontent
|see also=
|related=
|similar aircraft=
|lists=
|similar engines=
}}
References
=Notes=
{{reflist|refs=
{{cite journal | title= Fiat's New Helicopter - Notes on the 7002 and its powerplant| journal= Flight International | page= 110| date= 24 January 1958 |url=http://www.flightglobal.com/pdfarchive/view/1958/1958%20-%200108.html}}
{{cite journal | title= Fiat 7002 flies| journal= Flight International | page= 138| date= 3 February 1961 |url=http://www.flightglobal.com/pdfarchive/view/1961/1961%20-%200138.html}}
}}
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{{Fiat aeroengines}}
{{Aeroengine-specs}}