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Toroidal propeller. A toroidal propeller is a type of propeller that is ring-shaped with each blade forming a closed loop. The propellers are significantly quieter at audible frequency ranges, between 20 Hz and 20 kHz, while generating comparable thrust to traditional propellers. In practice, toroidal propellers reduce noise pollution in both ...
The engine was a Rolls-Royce Merlin 47 driving a four-bladed Rotol propeller of 10 ft 9 in (3.27 m) diameter; the new propeller provided increased thrust at high altitudes, where the atmosphere is much thinner. To help smooth out airflow around the wingtips the standard rounded types were replaced by extended, pointed versions extending the ...
The Lockheed C-130 Hercules is an American four-engine turboprop military transport aircraft designed and built by Lockheed (now Lockheed Martin ). Capable of using unprepared runways for takeoffs and landings, the C-130 was originally designed as a troop, medevac, and cargo transport aircraft. The versatile airframe has found uses in other ...
Contra-rotating propellers. Aircraft equipped with contra-rotating propellers ( CRP) [ 1] coaxial contra-rotating propellers, or high-speed propellers, apply the maximum power of usually a single piston engine or turboprop engine to drive a pair of coaxial propellers in contra-rotation. Two propellers are arranged one behind the other, and ...
Propeller (aeronautics) In aeronautics, an aircraft propeller, also called an airscrew, [ 1][ 2] converts rotary motion from an engine or other power source into a swirling slipstream which pushes the propeller forwards or backwards. It comprises a rotating power-driven hub, to which are attached several radial airfoil -section blades such that ...
Cyclorotor blades are also centrifugally loaded in bending (as opposed to the axial loading on propellers), which requires blades with an extremely high strength to weight ratio or intermediate blade support spokes. Early 20th century cyclorotors featured short blade spans, or additional support structure to circumvent this problem. [25] [26] [27]
The blades are the foil section plates that develop thrust when the propeller is rotated The hub is the central part of the propeller, which connects the blades together and fixes the propeller to the shaft. Rake is the angle of the blade to a radius perpendicular to the shaft. Skew is the tangential offset of the line of maximum thickness to a ...
A scimitar propeller is a type of propeller that has curved blades with increasing sweep along the leading edge. Their name is derived from their visual similarity to the curved blades of scimitars. In the early 1900s, as established by the French aeronautical inventor Lucien Chauvière and his commercial success with his scimitar-shaped ...
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