Four-stroke engine. An internal-combustion engine in which explosion of the mixture in each cylinder occurs at every alternate revolution of the crankshaft. Nearly all aero-engines work on the four-stroke cycle at present.
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In a four-stroke engine, the crankcase is completely separate from the combustion chamber, so you can fill the crankcase with heavy oil to lubricate the crankshaft bearings, ...
Two or four-stroke gasoline and glow engines are very popular in aircraft. Four-stroke engines tend to turn higher diameter lower pitch props, and therefore tend to be used in applications requiring more torque and less speed response.
 See also: Wind, Fuels, Force, Flight, Gravity
  
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