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A 6-bladed Hamilton Standard 568F propeller on an ATR 72 short-haul airliner. Lowry [27] quotes a propeller efficiency of about 73.5% at cruise for a Cessna 172.This is derived from his "Bootstrap approach" for analyzing the performance of light general aviation aircraft using fixed pitch or constant speed propellers.
The propeller characteristics are commonly expressed as dimensionless ratios: [31] Pitch ratio PR = propeller pitch/propeller diameter, or P/D; Disk area A 0 = πD 2 /4; Expanded area ratio = A E /A 0, where expanded area A E = Expanded area of all blades outside of the hub.
The propeller is designed by Ratier-Figeac and has a diameter of 5.33 m (17.5 ft). The reversible, variable-pitch propeller holds eight blades, each having a carbon spar enclosed by a composite shell and a polyurethane coating. [ 39 ]
The Pratt & Whitney Canada PW100 aircraft engine family is a series of 1,800 to 5,000 shaft horsepower (1,300 to 3,700 kW) turboprops manufactured by Pratt & Whitney Canada. Pratt & Whitney Canada dominates the turboprop market with 89% of the turboprop regional airliner installed base in 2016, leading GE Aviation and Allison Engine Company .
The Kuznetsov NK-93 was a civilian aircraft engine, ... seven full-size versions of the engine had been built, ... Propeller diameter: 2.9 m (9.5 ft; 290 cm; ...
A twin-engine aircraft carrying 100–150 passengers would require propfan diameters of 120–168 inches (300–430 cm; 10.0–14.0 ft; 3.0–4.3 m), [77] and a propfan with a propeller diameter of 236 in (600 cm; 19.7 ft; 6.0 m) would theoretically produce almost 60,000 lbf (270 kN) of thrust. [90]
Starting with the 167th aircraft, the propeller diameter was increased to 11 ft 7 in (3.53 m) and internal fuel reduced from 120 to 87 US gal (450 to 330 L; 100 to 72 imp gal); 500 built. P-39N-1 Variant with internal changes to adjust center of gravity when nose guns were fired; 900 built. P-39N-2
Diameter of the propeller. The propeller advance ratio or coefficient is a dimensionless number used in aeronautics and marine hydrodynamics to describe the relationship between the speed at which a vehicle (like an airplane or a boat) is moving forward and the speed at which its propeller is turning.
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