The engine made by Steve Manthey was one with barrel-type oscillating plates, that is, with the pistons horizontally around the drive shaft.

“Inner engine part of difficult interpretation”

-This schematic drawing is the one that appeared in PopMech as a novelty.

-The engine is named OX-2, it is said to have only three moving parts.

-It has eight cylinders that rotate while cylinder heads and cam plate remain fixed.

"This exploded view describes the engine better"

-In the United States it caught the attention of the University of California, but finally the one who has carried out the construction of this engine has been Advanced Engine Technologies. It is currently (2010) at level 3 of development, which is the one shown below.

“Manthey-AET, 3rd level”