ORPE employs a new design of conversion of a progressive piston
stroke into rotary motion of an elliptical shaped rotor and vice versa. This constructive
solution provides unprecedented weight & fuel consumption/power output ratio,
demonstrating definite advantages over all contemporary utilized engines,
including Wankel rotor engine.

Absence of the crankshaft minimizes the power losses caused in other engines’ by friction,
side-forces and vibrations.

With regard to the operating cycle within the ORPE, it corresponds to a two-stroke engine
with two pistons in one cylinder, moving from the opposite
directions, and with an inflow going through the intake and exhaust ports.
The ORPE two-stroke cycle is fulfilled for a half-turn of rotor.

Thus improving the mechanical efficiency (calculated at 95%, compared to 80% in
currently manufactured engines – hence 45% fuel saving).