# Why the Rotary Piston Engine is so efficient

The Rotary Piston Engine offers greater torque with less energy, in other word instant torque at TDC with far less loss on the power stoke stage. With a basic understanding of piston traveling in a circle, this allows greater torque and higher efficiency.
Lets look a basic design:

A 12" wheel or say rotor with a radius of 6", and having a piston of 1"x"1 or 1 in/sq.
This piston is attach to the outer wheel to travel in a housing of 14" diameter.
If we take psi or force onto the piston that energy will drive the rotor forward, so 120 psi of pressure will have a total torque of ((120 psi *6" crank)/12)=60 foot pounds, and at one revolution of the rotor with a constant pressure is(pi*12)/12)=3.14, 60 * 3.14 = 188 foot pounds of work per each revolution.
This engine has a external combustion chamber that allow the expanding heat to force the rotor forward, and also allows total pressure to move the piston 350 degree before exit the rotor. This allow total energy of force to be used with very little waste.
The most important thing is the piston area, this basic design could have a total power of (800psi*6")/12)=400ft/lb at 3600 rpms = (400*3600)/5252=274hp with a 1 in/sq piston
This is base on combustion of fuel at 800psi, but combustion chambers can produce over 2000 psi at TDC.
This is 12 times less energy needed to dive a single 4" piston in today's big block engines.
Have a efficiency of over 85%, this is based on how well the pressure hold in the rotary housing.

Tommey Reed