This is my fourth BBMG concept.  The basis of the design was inspired by looking at THIS.  This device can replace the typical air forced and spring returned pistons.  Because this Scoth Yoke mechanism will be able to imitate the same motion.  Im not sure what I want to use to turn the Scoth Yoke, I was thinking either a pneumatic powered turbine or sometype of electrical motor.  Both of them have there down sides, the pneumatic turbine will waste more air while a electrical motor add to the "bulkyness" as well as further more complicating the design.  Any soulutions?  Email me at pimpmann22@yahoo.com or write it under my topics in either Spudfiles or Spudtech.