What type of engine is commonly found in light aircraft?

The commonly found engine type in light aircraft is the 4-cylinder, horizontally opposed engine with 160 BHP. This design is prevalent because horizontally opposed engines, often referred to as "boxer" engines, have a low center of gravity, which enhances the aircraft's stability during flight. Additionally, they are typically more compact and lighter than other engine configurations, making them ideal for the lightweight and performance requirements of general aviation aircraft.

The 4-cylinder setup balances power and weight effectively, providing sufficient horsepower for light aircraft operations while maintaining fuel efficiency. Many popular light aircraft, such as the Cessna 172 and Piper Cherokee, utilize this type of engine due to its reliability, ease of maintenance, and proven performance characteristics.

In contrast, other engine configurations have different traits that may not suit the design criteria of light aircraft as effectively. For example, a flat engine design, though also low profile, may come in specific applications but is less common overall compared to horizontally opposed selections. The 6-cylinder models can provide more power but typically add weight, making them less ideal for the lighter end of general aviation. V-type engines are more commonly associated with larger aircraft or performance vehicles and may not offer the desired characteristics for light aircraft applications.