Patent ID: 7644804

Claim:
A system for attenuating sound in a combustion engine, the system comprising: an exhaust pipe coupled to and extending away from a combustion engine, the exhaust pipe channeling gas flow away from the combustion engine; and an attenuation chamber coupled to the exhaust pipe by an inlet configured to receive the gas flow channeled away from the combustion engine by the exhaust pipe, the attenuation chamber including a curvature that unfolds at a substantially constant order of growth when measured at equiangular radii between the inlet and an outlet coupled to the attenuation chamber, the curvature inducing a vortical flow that reduces turbulence and decreases audible sound associated with the gas flow, wherein the attenuation chamber is larger in volume than the inlet thereby allowing the gas flow to expand within the attenuation chamber, the expansion of the gas flow resulting in a decrease in the speed of the gas flow as the gas flow passes through the outlet, the decrease in speed of the gas flow resulting in a further reduction in audible sound associated with the gas flow.