Small planes use boxer engines because they're lightweight, run smoothly, and have better cooling — all of which are crucial ...

An engine similar to this type powered Santos-Dumont's Demoiselle aircraft. Matthew B. Sellers, builder of the first Kentucky-manufactured aircraft, flew his first quadraplane from 1908 to 1913 ...

It looks something like a typical horizontally-opposed engine, but each cylinder actually has two back-to-back pistons and combustion chambers, all of which is connected to a central driveshaft.

The cylinders were arranged in two blocks of horizontally opposed configurations. So you have two 12-cylinder engines facing each other and sharing a common crankshaft.

The horizontally opposed engine layout made famous by Volkswagen has long been favoured by Subaru and has been the mainstay of its fleet for more than three decades with its latest effort winning ...

Certificated in April 1931, the Aeronca E-113 was an outgrowth of the Wright-Morehouse engine and was designed again for light aircraft. Considered highly reliable, it was the most powerful ...

Cessna, a Textron Aviation brand, currently offers several types of single-engine aircraft that fulfill a wide variety of ...

Far less common are horizontally opposed engines, which usually arrange four or six cylinders horizontally in relation to the crankshaft. This is why they are often called flat-4 or flat-6 engines.

The four-cylinder, horizontally opposed "Boxer" engine is so ubiquitous within Subaru that it's only been substantially redesigned once since 1966.

Ferrari continues to explore hydrogen-powered drivetrain solutions, patent documents discovered by AutoGuide.com indicate Ferrari is looking at a two-stroke 3- or 6-cylinder opposed piston engine ...

Horizontally opposed engines like those used in Subarus and in Porsche's sports cars don't sit in a straight line or V-shape like most engines on the market, the pistons move horizontally, or flat.