The propeller speed reduction unit of a Rolls-Royce R engine
A propeller speed reduction unit is a gearbox or a belt and pulley device used to reduce the output revolutions per minute (rpm) from the higher input rpm of the powerplant.[1] This allows the use of small displacement internal combustion engines to turn aircraft propellers within an efficient speed range.
^Gunston 2006, p. 82.
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also be started manually by pulling a cable). After the Riedel unit has reached a speed of about 300 rpm, it automatically engages the compressor shaft...
an aircraft to be designed with a variable-pitch propeller, to give maximum thrust over a larger speed range. A fine pitch would be used during take-off...
of British engines. Aircraft fitted with variable-pitch propellers or constant speedpropellers are started in fine pitch to reduce air loads and current...
turboprop is a turbine engine that drives an aircraft propeller. A turboprop consists of an intake, reduction gearbox, compressor, combustor, turbine, and a...
reduces propeller efficiency at high rotational speed which, in turn, reduces power transmission from the aircraft's engine. In the case of a propeller, this...
constant speed drive (CSD) also known as a constant speed generator, is a type of transmission that takes an input shaft rotating at a wide range of speeds, delivering...
pumps; should all the engines fail in flight the pilot will deploy a propeller-driven electric generator called a Ram-Air Turbine (RAT) which is concealed...
the rated pressure and speed. In electronics, volumetric efficiency quantifies the performance of some electronic function per unit volume, usually in as...
The power section consists of additional stages of turbines, a gear reduction system, and the shaft output. The gas generator creates the hot expanding...
Scaled Composites. Concorde flew long distances at supersonic speeds. Sustained high speeds would be impossible with the high fuel consumption of afterburner...
propellerspeedreductionunit to maintain propellers within the designed speed range. Experimental aircraft with Wankel engines use propellerspeed reduction...
rocket to a speed of about 90 m/s, which allowed the rocket to reach an altitude of 450 m. In 2023 researchers announced a demonstration unit of a hybrid...
Reverse thrust is also available on many propeller-driven aircraft through reversing the controllable-pitch propellers to a negative angle. The equivalent...
Motivated by government regulations mandating reduction of fuel consumption (in the USA) or reduction of carbon dioxide emissions (in Europe), passenger...
use of the pulsejet engine, with the volume production of the Argus As 014 unit (the first pulsejet engine ever in volume production), was for use with the...
providing fuel to the engine, the fuel system is also used to control propellerspeeds, compressor airflow and cool lubrication oil. Fuel is usually introduced...
Zelina, J.; Shouse D. T.; Roquemore, W.M. (March–April 2005). "Emissions Reduction Technologies for Military Gas Turbine Engines". Journal of Propulsion...
formation of ice. The air then exits through small holes in the wing edge. On propeller-driven aircraft, it is common to use bleed air to inflate a rubber boot...
provide air for combustion. Ramjets work most efficiently at supersonic speeds around Mach 3 (2,300 mph; 3,700 km/h) and can operate up to Mach 6 (4,600 mph;...
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