Rotax 618

The Rotax 618 is a 73.8 hp (55 kW) two-stroke, two-cylinder, liquid cooled, gear reduction-drive engine that was formerly manufactured by BRP-Rotax GmbH & Co. KG. It was designed for use on ultralight aircraft.[1][2]

618
Type Piston aero-engine
National origin Austria
Manufacturer Rotax
Major applications Murphy Renegade
Blue Yonder Merlin

Development

The 618 features liquid-cooled cylinder heads and cylinders with a rotary valve inlet and an exhaust valve. Cooling is via one or two externally mounted radiators. Lubrication is by use of pre-mixed fuel and oil at 50:1 or oil injection. The 618 has dual Ducati capacitor discharge ignition systems and is equipped with two piston-type carburetors. It uses a manifold-driven pneumatic fuel pump to provide fuel pressure.[1]

The engine's propeller drive is via a Rotax type C or E style gearbox. The standard engine includes a muffler exhaust system and an intake silencer and filter, with an after muffler also available to further reduce engine noise. The standard starter is an electric starter. An integral alternating current generator produces 12 volts and 200 watts.[1]

The Rotax 618 is no longer in production.

Applications
Murphy Renegade Spirit biplane powered by a Rotax 618

Specifications (Rotax 618)

General characteristics

  • Type: 2-cylinder, 2-stroke, rotary valve, oil-in-fuel or oil-injected lubrication, dual carburetors, dual ignition
  • Bore: 76 mm (2.99 in)
  • Stroke: 68 mm (2.68 in)
  • Displacement: 617 cm³ (37.65 cu in)
  • Dry weight: 59.1 kg 130.4 lb with electric starter, two carburetors, radiator, intake silencer, exhaust system and E gearbox

Components

  • Valvetrain: rotary inlet valve, exhaust valve
  • Fuel type: premium unleaded: RON 90 octane or higher leaded or unleaded or AVGAS 100 LL
  • Oil system: oil-in-fuel (pre-mix) at 50:1
  • Cooling system: liquid cooled

Performance

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See also

References
  1. Raisner, William: LEAF catalog, pages 6-105. Leading Edge Airfoils, 1995.
  2. BRP-Rotax GmbH & Co. KG (n.d.). "618 UL - 73.8 HP" (PDF). Retrieved 7 January 2012.


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