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A variable pitch fan is similar in concept to that of a variable-pitch propeller and involves progressively reducing the pitch (or blade angle) of the fan on a turbofan as the engine is throttled. Although variable pitch fans are used in some industrial applications, the focus of this article is on their use in turbofan engines .
The UltraFan is a geared turbofan with a variable pitch fan system that promises at least 25% efficiency improvement. [84] The UltraFan aims for a 15:1 bypass ratio and 70:1 overall pressure ratio. [85] The Ultrafan keeps the Advance core, but also contains a geared turbofan architecture with variable-pitch fan blades.
The Turbomeca Astafan is a single-spool, variable-pitch turbofan engine developed from the Turbomeca Astazou. [1]: 553 [2]: 932 Despite successful flight-testing, an efficient, quiet and clean design (compared to turbojets and conventional turbofans) [1]: 554–555 [3]: 1648 [4]: 1872 and some commercial interest, [5]: 1683 the Astafan never entered series production.
The M45SD-02 variable geometry fan engine at the New Mills Technology Centre. M45F Civil low bypass turbofan 7,915 lbf (35.21 kN) for take-off. [5] M45G Military low bypass turbofan 13,200 lbf (58.72 kN) for take-off, wet. [5] M45H Civil medium bypass turbofan 7,880 lbf (35.05 kN) for take-off, wet. [5] RB.410
A CJ805-21 turbofan on display at Flugausstellung Hermeskeil. Note the visible fan stage at the rear of the engine casing, unlike the more common shaft driven fan located to the front. Type Turbojet (CJ805) Turbofan (CJ805-23) National origin: United States: Manufacturer General Electric Aircraft Engines: Major applications: CJ805: Convair 880
Aircraft fitted with variable-pitch propellers or constant speed propellers are started in fine pitch to reduce air loads and current in the starter motor circuit. [ citation needed ] Many light aircraft are fitted with a 'starter engaged' warning light in the cockpit, a mandatory airworthiness requirement to guard against the risk of the ...
One of the major differences between the F404 and the F414 is the fan section. The F414 fan is larger than that of the F404, but smaller than the F412 fan. [4] The larger fan increases the engine airflow by 16%, is 5 inches (13 cm) longer, and increased diameter from 28 inches (71 cm) to 31 inches (79 cm).
The General Electric GE36 was an experimental aircraft engine, a hybrid between a turbofan and a turboprop, known as an unducted fan (UDF) or propfan.The GE36 was developed by General Electric Aircraft Engines, [3] with its CFM International equal partner Snecma taking a 35 percent share of development. [4]