Anyway, yes the motor is clever... No it is not totally new... Any gear
head able to walk and chew gum recognizes it as a bump valve steam
engine... The original thinking is using a fixed shelf as the piston,
with eccentric faces that allow the extended piston head to swing in an
arc... This will work at low speeds and low pressures with a neoprene
0-ring as the piston seal...

denny