Two types of mechanisms, rotary and reciprocating
piston, have been investigated by engine designers to
provide society with an efficient but economical mobile
power source. The reciprocating piston engine became
the dominant mechanism for internal combustion
engines because of the simplicity of the combustion
chamber sealing design. However, many problems still
exist in the piston-crank design that limits the efficiency
of this mechanism. Likewise, complications of the rotary
mechanism sealing (namely airtightness and durability)
have hampered the rotary engine as a viable and
economical power plant. With the development of new
technologies the attractiveness of the rotary engine
advantages are making a comeback in the minds of
many designers