Solution for heavy slow vehicles

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This ratio is about 3.5 in a small fast vehicle, while it is about 7 in a slow heavy commercial vehicle.

This extra length of the connecting rod, needed to secure higher torque force,resulting in a lower vehicle speed,  can be partially given up, by lending a higher torque requirement to a turbo charge or other induction charge method, to increase the cylinder mean effective pressure during the second part of the power stroke.

Also if we used the method of every stroke is a power stroke in our Relative-Motion Engine, then  2000 RPMs is equivalent to a Conventional Engine doing 4000 RPMs. This fact allows us to design higher speed vehicles while moving at lower engine rotation limits.

When every stroke is a power stroke, certain power output requirements can be achieved at half the piston RPM, and that will double the available air flow per cycle, causing an elevation in the torque curve which is proportionate with thermal efficiency and air flow per cycle, 

The Air flow per cycle, also depends on the induction charge boost, which not only can be utilized at over 70% energy recovery rate of efficiency at our relative motion design, compared with 25% efficiency in conventional engine, but also induction charge in the relative motion method, can be applied during the time span of the power stroke, while in conventional engines, turbo-charge  can only change the pre combustion conditions.

For all that, a heavy vehicle can now be  doing a more robust work 

Known challenges with commercial vehicles is the need for bigger number and bigger size of working cylinders, needed to meet the higher loads requirements. 

Trends in developing modern engines, tend to down size cylinders and to minimize piston average speeds, along with supercharging the engine.

Our Relative Motion engine allows air induction during the time span of the power stroke, rather than pre-stroke charging, which can allow the use of much smaller engines without sacrificing torque capabilities, or to keep size along with riding of needs to bigger size inter-cooling devices .

A power stroke every cycle means we can also operate at lower conventional piston speeds, to achieve less friction and less heat production along with minimizing the cooling requirements.

Relative-Motion solution is also mainly beneficial for solving diesel challenges of exhaust emission. Diesel engine noise is decreased by minimizing/preserving a stroke initial force by more than three folds.