Tie Your Mother Down was from Queen's 1986 album.
A free-piston engine is a linear , ` crankless ' internal combustion engine , in which the piston motion is not controlled by a crankshaft but determined by the interaction of forces from the combustion chamber gases , a rebound device -LRB- e.g. , a piston in a closed cylinder -RRB- and a load device -LRB- e.g. a gas compressor or a linear alternator -RRB- .. internal combustion engine. internal combustion engine. crankshaft. crankshaft. combustion chamber. combustion chamber. gas compressor. gas compressor. linear alternator. linear alternator. The purpose of all such piston engines is to generate power .. In the free-piston engine , this power is not delivered to a crankshaft but is instead extracted through either exhaust gas pressure driving a turbine , through driving a linear load such as an air compressor for pneumatic power , or by incorporating a linear alternator directly into the pistons to produce electrical power .. crankshaft. crankshaft. linear alternator. linear alternator. pneumatic. pneumatic. The basic configuration of free-piston engines is commonly known as single piston , dual piston or opposed pistons , referring to the number of combustion cylinders .. The free-piston engine is usually restricted to the two-stroke operating principle , since a power stroke is required every fore-and-aft cycle .. two-stroke. two-stroke. However , a split cycle four-stroke version has been patented , GB2480461 -LRB- A -RRB- published 2011-11-23 .. split cycle. split cycle. four-stroke. four-stroke