The Lycoming O-235 is a four-cylinder, air-cooled, horizontally opposed aircraft engine. It is commonly used in light aircraft and is known for its reliability and efficiency. With a displacement of 235 cubic inches, it typically produces around 100 to 125 horsepower, making it suitable for various general aviation applications. This engine is popular among flight schools and private pilots due to its straightforward design and ease of maintenance. The O-235 has been utilized in several aircraft models, including the Cessna 152 and Piper Cherokee, contributing to its reputation as a dependable choice for training and recreational flying.