It seems they optimized on package width, hence the oversquare bore/stroke ratio and the flathead design. Use of liquid cooling probably helps make up for the poor volumetric efficiency of the L-head.
Experimental and light-sport aircraft have a lot of engine choices, but the vast majority are flat-four, overhead valve, and air cooled. Some are direct-drive, while others use some sort of propeller speed reduction, usually belt drive. In general, they follow the example of the very popular Continental O-200, a 70 year old design.
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Today's Featured Article - Hydraulic Basics - Part 2 - by Curtis Von Fange. In the last entry to this series we gave a brief overview of hydraulic system theory, its basic components and how it works. Now lets take a look at some general maintenance tips that will keep our system operating to its fullest potential. The two biggest enemies to a hydraulic system are dirt and water. Dirt can score the insides of cylinders, spool valves and pumps. Wate
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