AM.III.A.S9

From the FAA library

• Pilot's Handbook of Aeronautical Knowledgep. 7-2
  Chapter 7: Aircraft Systems › Reciprocating Engines

  horizontally-opposed engine, which remains the most popular reciprocating engines used on smaller aircraft. These engines always have an even number of cylinders, since a cylinder on one side of the crankcase “opposes” a cylinder on the other side. [Figure ... majority of these engines are air cooled and usually are mounted in a horizontal position when installed on fixed-wing airplanes. Opposed-type engines have high power-to-weight ratios because they have a comparatively small, lightweight crankcase. In addition…

• Aviation Maintenance Technician Handbook - Powerplantp. 1-3
  Chapter 1: Aircraft Engines › Types of Engines › Inline Engines

  Inline Engines An inline engine generally has an even number of cylinders, although some three-cylinder engines have been constructed. This engine may be either liquid cooled or air cooled and has only one crank shaft, which is located either ... above or below the cylinders. If the engine is designed to operate with the cylinders below the crankshaft, it is called an inverted engine. The inline engine has a small frontal area and is better adapted to streamlining. When mounted…

• Aviation Maintenance Technician Handbook - Powerplantp. 11-5
  Chapter 11: Light-Sport Aircraft Engines › Opposed Light-Sport, Experimental, & Certificated Engines

  Opposed Light-Sport, Experimental, & Certificated Engines Many certificated engines are used with light-sport and experimental aircraft. Generally, cost is a big factor when considering this type of powerplant. The certificated engines tend to be much more costly than ... certificated engines, and are not ASTM approved. Figure 11-6 shows a typical four cylinder, four-stroke Rotax horizontally opposed engine. The opposed-type engine has Figure 11-5 Rotax 503 and 582 electrical system. Figure 11-6. Typical four…