[video=youtube_share;mdcYTbnT3iE]http://youtu.be/mdcYTbnT3iE[/video] This was designed for converting bidirectional rotary motion from a pendulum type engine to unidirectional rotary output. It seems to have very high mechanical advantage throughout the oscillations. Conventional crank and slider type engines have poor mechanical advantage when the pressure on the pistons is highest. This should yield much better fuel efficiency. This simulation shows concept only. Actual production can have extra gears or can be gear-less, but using the same concept.