A report on Propeller speed reduction unit

The propeller speed reduction unit of a Rolls-Royce R engine
Simple spur gear reduction

Gearbox or a belt and pulley device used to reduce the output revolutions per minute from the higher input rpm of the powerplant.

- Propeller speed reduction unit
The propeller speed reduction unit of a Rolls-Royce R engine

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The propellers of a C-130J Super Hercules military transport aircraft

Propeller (aeronautics)

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Airscrew, converts rotary motion from an engine or other power source into a swirling slipstream which pushes the propeller forwards or backwards.

Airscrew, converts rotary motion from an engine or other power source into a swirling slipstream which pushes the propeller forwards or backwards.

The propellers of a C-130J Super Hercules military transport aircraft
A decorated Japanese taketombo bamboo-copter
Leonardo's aerial screw
Prototype created by Mikhail Lomonosov, 1754
A 6-bladed Hamilton Standard 568F propeller on an ATR 72 short-haul airliner
A sailor checks the propeller of a Landing Craft Air Cushion hovercraft
Cut-away view of a Hamilton Standard propeller. This type of constant-speed propeller was used on many American fighters, bombers and transport aircraft of World War II
Feathered propeller on the outboard TP400 turboprop of an Airbus A400M
Counter-rotating propellers

The propeller attaches to the power source's driveshaft either directly or through reduction gearing.

The Rolls-Royce Merlin

Rolls-Royce Merlin

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British liquid-cooled V-12 piston aero engine of 27-litres capacity.

British liquid-cooled V-12 piston aero engine of 27-litres capacity.

The Rolls-Royce Merlin
The Rolls-Royce Merlin
Parallel valve Merlin cylinder head
Merlin 55 ejector exhaust detail, Spitfire LF.VB, EP120
Preserved Merlin 63 showing intercooler radiator, supercharger and carburettor
Page from Pilot's Notes Merlin II, III and V (A.P.1590B), explaining the use of +12lbs boost and 100 Octane fuel.
Rolls-Royce factory, Nightingale Road, Derby (photo 2005)
Workers assembling cylinder heads on the Hillington Merlin production line in 1942
Preserved Merlin XX at the Royal Air Force Museum London
Rolls-Royce Merlin with components labelled
alt=An inflight image of a four-engined bomber aircraft|Avro Lancaster B I powered by four Merlin XXs
alt=An inflight image of a twin-engined monoplane aircraft|The "slimline" Merlin 130/131 series were designed for the de Havilland Hornet
alt=An inflight image of a twin-engined monoplane aircraft. The aircraft has a camouflaged paint scheme.|The Merlin 76-powered Vickers F.7/41

Two aluminium-alloy castings joined together on the horizontal centreline. The upper portion bears the wheelcase, supercharger and accessories; and carries the cylinder blocks, crankshaft main bearings (split mild-steel shells lined with lead bronze alloy), and part of the housing for the airscrew reduction gear. The lower half forms an oil sump and carries the oil pumps and filters.

Rotax 912ULS 100 hp installation in a 3Xtrim 3X55 Trener

Rotax 912

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Rotax 912ULS 100 hp installation in a 3Xtrim 3X55 Trener
Rotax 912ULS 100 hp installation in a Blue Yonder Merlin EZ
Pusher engine installation of two Rotax 912ULSs in a Lockwood Aircam
Rotax 912ULS with tuned exhaust in a Dyn'Aéro MCR01 with 3-blade hydraulic CSU propeller.

The Rotax 912 is a horizontally-opposed four-cylinder, naturally aspirated, four-stroke aircraft engine with a reduction gearbox.

Tiara 0-405 on display at the Rolls-Royce Heritage Trust Derby

Continental Tiara series

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The Continental Tiara series are a family of air-cooled, horizontally opposed aircraft engines.

The Continental Tiara series are a family of air-cooled, horizontally opposed aircraft engines.

Tiara 0-405 on display at the Rolls-Royce Heritage Trust Derby

The engines had high rotational speeds, 0.5:1 gearing was used to reduce propeller speed, with the camshaft forming an extension of the propeller shaft.