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Rotax 503
The Rotax 503 is a , inline 2-cylinder, two-stroke aircraft engine, built by BRP-Rotax GmbH & Co. KG of Austria for use in ultralight aircraft.〔Raisner, William: ''LEAF catlog'', pages 6-105. Leading Edge Airfoils, 1995.〕
As of 2011 the Rotax 503 is no longer in production.
==Design and development==
The Rotax 503 features piston ported, air-cooled cylinder heads and cylinders, utilizing either a fan or free air for cooling. Lubrication is either by use of pre-mixed fuel and oil or oil injection from an externally mounted oil tank. The 503 has dual independent breakerless, magneto capacitor-discharge ignition (CDI) systems and can be equipped with either one or two piston-type carburetors. It uses a manifold-driven pneumatic fuel pump to provide fuel pressure. An optional High Altitude Compensation kit is available.〔〔
The engine's propeller drive is via a Rotax type B, C, or E style 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.〔〔
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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