Rotax 447

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Austrian two-stroke aircraft engine

title: "Rotax 447" type: doc version: 1 created: 2026-02-28 author: "Wikipedia contributors" status: active scope: public tags: ["rotax-engines", "air-cooled-aircraft-piston-engines", "two-stroke-aircraft-piston-engines"] description: "Austrian two-stroke aircraft engine" topic_path: "general/rotax-engines" source: "https://en.wikipedia.org/wiki/Rotax_447" license: "CC BY-SA 4.0" wikipedia_page_id: 0 wikipedia_revision_id: 0

::summary Austrian two-stroke aircraft engine ::

::data[format=table title="infobox aero engine"]

FieldValue
name447
engine_typePiston aero-engine
manufacturerRotax
national_originAustria
major_applicationsQuad City Challenger I
::

| name=447 | image= | caption= |engine_type=Piston aero-engine |manufacturer=Rotax |national_origin=Austria |first_run= |major_applications=Quad City Challenger I |produced= |number_built= |developed_from= |variants_with_their_own_articles=

The Rotax 447 is a 41.6 hp, inline 2-cylinder, two-stroke aircraft engine, built by BRP-Rotax GmbH & Co. KG of Austria for use in ultralight aircraft.

Design and development

The Rotax 447 is a development of the Rotax 377, increasing the power output from 26 kW to 29.5 kW by increasing the cylinder bore from 62 mm to 67.5 mm and the maximum rpm from 6500 to 6800. The modern 447 has a single breakerless, magneto capacitor-discharge ignition (CDI) system. Early (ca. 1988) models use a breaker point ignition system.

The Rotax 447 features piston-ported, air-cooled cylinder heads and cylinders, utilizing either a fan or free air for cooling. Lubrication is by use of pre-mixed fuel and oil. The engine can be equipped with either one or two piston-type float carburetors. The dual-carburetor version uses Bing model 84 carburetors. The single-carburetor version uses a Bing model 54 carburetor. An optional High Altitude Compensation kit is available. It is typically installed with an induction-pulse-driven diaphragm fuel pump to provide fuel pressure.

The engine's propeller drive is via a Rotax type B gearbox. The standard engine includes a muffler 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 intake silencer system.

The manufacturer acknowledges the design limitations of this engine, warning pilots:

Variants

;447 UL-1V :basic engine equipped with a single carburettor, 39.6 hp at 6800 rpm ;447 UL-2V :basic engine equipped with two carburettors, 41.6 hp at 6800 rpm

Applications

Specifications (447)

and start a new, fully formatted line with -- |ref=OPERATORS MANUAL FOR ENGINE TYPES 447, 503 & 582 |type=two-stroke air-cooled aeroengine |bore=67.5 mm (2.66 in) |stroke=61 mm (2.4 in) |displacement=426.5 cc (26.64 cu in) |length= |diameter= |width= |height= |weight=26.8 kg (59 lb) (dry, no exhaust system) |valvetrain=piston ports |supercharger= |turbocharger= |fuelsystem=pneumatic pump pressurized |fueltype=regular autofuel |oilsystem=premixed in the fuel at 50:1 or oil injection |coolingsystem=fan or free air |power=30 kW at 6800 rpm |specpower= |compression=9.6 (theoretical) 6.3 (effective) |fuelcon=11 litres/hr (3 US gph) |specfuelcon= |oilcon= |power/weight=1.12 kW/kg (0.68 hp/lb)

|designer= |reduction_gear= Rotax 'B' gearbox: 2.00, 2.24, 2.58 ratios

|general_other= |components_other= |performance_other=

|see also= |related= |similar aircraft= |lists=

References

References

  1. [[Rotax. (2006). "OPERATORS MANUAL FOR ENGINE TYPES 447, 503 & 582".
  2. Raisner, William: ''LEAF catalog'', pages 6-105. Leading Edge Airfoils, 1995.
  3. AMS Flight d.o.o.. "Apis AMS". ams-flight.si.
  4. AMS Flight d.o.o.. "Technical data Apis MC Advanced Ultra Light Aeroplane". ams-flight.si.

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rotax-enginesair-cooled-aircraft-piston-enginestwo-stroke-aircraft-piston-engines