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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 ...
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 ...
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 ...
The 501-M78B had the same 13-stage compressor, combustor, 2-stage gas producer turbine, and 2-stage free power turbine used on the XT701 and 570-K, but it was connected through a 6.797 reduction ratio gearbox to a 9 ft diameter (2.7 m) Hamilton Standard single-rotation propfan, containing propfan blades that were swept back 45 degrees at the tips.
Even though there is no generally accepted term for these open-flow hydro turbines, some sources refer to them as water-current turbines. There are three main types of water current turbines that might be considered: axial-flow horizontal-axis propellers (with both variable-pitch or fixed-pitch), underwater kites and cross-flow Darrieus rotors ...
Prosecutors charged an Oklahoma City police officer with felony assault on Thursday after he slammed a 71-year-old man to the ground, breaking his neck, following an argument over a traffic ticket.
Germany's parliamentary election on Feb. 23 will be the first under new rules designed to cut the size of a parliament that had grown too unwieldy, but they also make vote outcomes harder to forecast.
The company's line of propellers started development in 1988 and consisted of variable-pitch, ground-adjustable and constant-speed propellers. [1] [2] By 2016 the company's website was for sale and the company business seems to have been wound up. [3]