FAA Powerplant Written Practice Test

Which type of engine is specifically characteristic of the light sport aircraft category?

1. Rotary engines

2. Two-stroke engines

3. Diesel engines

4. Radial engines

The correct answer is: Two-stroke engines

The choice of two-stroke engines is particularly relevant to light sport aircraft due to their simplicity, lightweight design, and ability to provide a good power-to-weight ratio. Light sport aircraft are typically designed to be efficient and easy to operate, and two-stroke engines align well with these requirements. Two-stroke engines have fewer moving parts compared to their four-stroke counterparts, which leads to reduced weight and maintenance complexity. This is beneficial in the light sport aircraft category, where weight limitations are critical and ease of use is a significant factor for pilots. Additionally, two-stroke engines can often run on a mixture of oil and gasoline, simplifying fueling processes. In contrast, the other engine types mentioned may not be as common or suitable in light sport aircraft. For instance, while rotary engines are known for their unique design and smooth operation, they may not be as prevalent in this category. Diesel engines offer fuel efficiency and durability but can be heavier and more complex than necessary for light sport applications. Radial engines, while historically important in aviation, are also heavier and more complex than what is typically sought for light sport aircraft, which prioritize simplicity and lightweight characteristics.