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582
	Rotax 582 pusher installation on a Quad City Challenger II
Type	Piston aero-engine
National origin	Austria
Manufacturer	Rotax
Major applications	Quad City Challenger; Blue Yonder Merlin
Status	Production to be completed by end of 2021
Produced	1989-2021
Number built	more than 30,000 (July 2021)

The Rotax 582 is a 48 kW (64 hp) two-stroke, two-cylinder, rotary intake valve, oil-in-fuel or oil injection pump, liquid-cooled, gear reduction-drive aircraft engine manufactured by BRP-Rotax GmbH & Co. KG. It is for use in non-certified aircraft operating in day visual flight rules.^[3]

Production of the engine ended at the end of 2021.^[1]

Development

The Rotax 582 is based upon the earlier Rotax 532 engine design and was designed for ultralight aircraft.^[4]^[5] The 582 increased the bore from the 532 engine's 72 to 76 mm (2.8 to 3.0 in). This increased the displacement from 521.2 cc (31.81 cu in) to 580.7 cc (35.44 cu in), an increase of 11%. The increased displacement had the effect of flattening out the 532's torque curve and allowed the 582 to produce useful power over a wider rpm range. Reliability over the 532 was also improved.^[5]

The 582 features liquid-cooled cylinder heads and cylinders with a rotary intake valve. Cooling is via an externally mounted radiator. Lubrication is either by use of pre-mixed fuel and oil or oil injection from an externally mounted oil tank. The 582 has dual independent breakerless, magneto capacitor discharge ignition (CDI) systems and is equipped with two piston-type carburetors. It uses a manifold-driven pneumatic fuel pump to provide fuel pressure. An optional High Altitude Compensation kit is available.^[4]^[5]^[3]

Early in the engine's production the propeller drive was via a Rotax type B gearbox, which offered gear ratios of 2.0:1, 2.238:1, and most common 2.58:1. Later in production type C or E gearboxes were offered with gear ratios of 2.62:1, 3.0:1, 3.47:1, and 4.0:1. (The type E gearbox includes an integrated electric starter motor.) The standard engine includes a wide band expansion chamber exhaust system with an extra after-muffler as optional. The standard starter is a recoil start type, with an electric starter optional. An integral alternating current generator producing 170 watts at 12 volts with external rectifier-regulator is optional. The engine includes an intake air filter and can be fitted with an optional intake silencer system.^[4]^[5]

By July 2021, more than 30,000 engines had been sold.^[1]

In July 2021, the manufacturer announced that the engine's production run will end by the end of the year, although the engine will still be sold until stocks are depleted.^[1]

Limitations

Rotax recommends teardown and inspection every 150 hours, and overhaul every 300 hours.^[3]

The manufacturer acknowledges the design limitations of this engine, warning pilots:^[4]

"This engine, by its design, is subject to sudden stoppage. Engine stoppage can result in crash landings, forced landings or no power landings. Such crash landings can lead to serious bodily injury or death...This is not a certificated aircraft engine. It has not received any safety or durability testing, and conforms to no aircraft standards. It is for use in experimental, uncertificated aircraft and vehicles only in which an engine failure will not compromise safety. User assumes all risk of use, and acknowledges by his use that he knows this engine is subject to sudden stoppage...Never fly the aircraft equipped with this engine at locations, airspeeds, altitudes, or other circumstances from which a successful no-power landing cannot be made, after sudden engine stoppage. Aircraft equipped with this engine must only fly in DAYLIGHT VFR conditions."^[4]

Applications

Blue Yonder EZ Flyer showing its Rotax 582 engine installation, including the radiator suspended below the engine.

Specifications (Rotax 582)

General characteristics

Type: two-cylinder, two-stroke, rotary valve, oil-in-fuel or oil-injected lubrication, dual carburetors, electronic dual ignition
Bore: 76 mm (2.99 in)
Stroke: 64 mm (2.52 in)
Displacement: 580.7 cm³ (35.44 cu in)
Dry weight: 50 kg (110 lb) with electric starter, carburetors, fuel pump, air filters and reduction gear

Components

Fuel type: premium unleaded: RON 90 octane or higher leaded or unleaded or AVGAS 100 LL
Oil system: oil-in-fuel (pre-mix) or oil injection
Cooling system: liquid cooled