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e In-line engines have a comparatively small frontala etheir power-to-weight ratios are relatively low. In addition 7the rearmost cylinders of an air-cooled, in-linec FigulU me area, but little cooling air, so these engines are normally engine very limited to four or six cylinders. V-type engines provide more horsepower than in-line engines and still retain a small receive frontal area. Continued improvements in engine design Jede development of the horizontally-opposed engine, which remains the most popular reciprocating engines used smaller aircraft. These engines always have an even number of cylinders, since a cylinder on one side of the crankcase "opposes" a cylinder on the other side. [Figure 7-2] The majority of these engines are air cooled and usually are mounted in a horizontal position when installed on fixed-wing airplanes. Opposed-type engines have high power-to-weight ratios because they have a comparatively small, lightweight crankcase. In addition, the compact cylinder arrangemen reduces the engine's frontal area and allows a streamlined installation that minimizes aerodynamic drag.