What type of engine does the PA-28A have?

The PA-28A is equipped with a horizontally opposed, air-cooled engine, which is a key feature for this aircraft model. The design of a horizontally opposed engine allows for a lower center of gravity and better weight distribution, which can enhance the aircraft's handling and performance. Additionally, air-cooled engines are generally simpler and lighter than liquid-cooled counterparts, which is advantageous in light aircraft where weight is a crucial consideration.

Characteristic of the horizontally opposed configuration, the engine consists of cylinders arranged in two rows, opposite one another. This not only contributes to the overall efficiency of the engine but also helps maintain a compact design, fitting well within the streamlined profile of the PA-28A. This arrangement also makes it easier to maintain and inspect the engine components.

Liquid-cooled engines, radial engines, and inline engines do not match the design ethos and operational efficiencies sought in the PA-28A, which helps further solidify the accuracy of the selected answer. Understanding these aspects emphasizes not only the mechanical features but also the reasoning behind aircraft design choices in general aviation.