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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.
Propulsive efficiency comparison for various gas turbine engine configurations. In the 1970s, Hamilton Standard described its propfan as "a small diameter, highly loaded multiple bladed variable pitch propulsor having swept blades with thin advanced airfoil sections, integrated with a nacelle contoured to retard the airflow through the blades thereby reducing compressibility losses and ...
compressor handling at part speed is facilitated by several rows of variable pitch stators at the front part of the unit. This was a fairly novel feature when the engine was first introduced. a single stage power turbine. which delivers power to the rear of the engine. The hot exhaust stream is diverted sideways, away from the output shaft.
A 5,450 shp (4,060 kW) similar to the 501-M25 but with a free turbine instead of a fixed turbine, and a two-stage gas producer turbine; [20] based on the T56-A-18 engine. [21] 501-M34 A 5,175 shp (3,859 kW) turboshaft engine targeted for a 60-70 seat commuter helicopter proposal from Lockheed-California in 1966. [22] 501-M56
The turbine's vanes rotate in unison, relative to its hub, to vary its pitch and cross-sectional area. VNTs offer higher flow rates and higher peak efficiency compared to other variable geometry designs. [3] Sliding Wall Turbines are commonly found in heavy-duty engines. The vanes do not rotate, but instead, their effective width is changed ...
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The compressor spool, turbine and compressor, is in green. The free power turbine is in purple. A free-turbine turboshaft is a form of turboshaft or turboprop gas turbine engine where the power is extracted from the exhaust stream of a gas turbine by an independent turbine, downstream of the gas turbine. The power turbine is not mechanically ...
In 1919 L. E. Baynes patented the first automatic variable-pitch airscrew. Wallace Rupert Turnbull of Saint John, New Brunswick, Canada is credited in Canada for creating the first variable pitch propeller in 1918. [5] The French aircraft firm Levasseur displayed a variable-pitch propeller at the 1921 Paris Air Show. The firm claimed that the ...