Patent ID: 6555931
Filing Date: 2003-04-29
Classification: F03B,F03D,F05B,Y02E

Abstract:
A renewable energy generating system comprising:a long-stroke open-channel reciprocating engine having at least one tethered flow engaging element, said flow engaging element being one of at least one drogue chute in water or at least one floatable airfoil in air, which is cyclically switchable from a low force mode to a high force mode and vice-versa to extract energy from fluid flow engaging said at least one tethered flow engaging element; wherein said energy is extracted by unwinding said at least one tether from a cyclically reversed power drum thereby converting said extracted fluid flow energy into mechanical energy; wherein said at least one flow engaging element has a control element controlling cyclic switching from said low force to said high force mode and vice-versa upon command; wherein mechanical energy of said cyclically reversed power drum is converted to unidirectional rotation to drive an electric generator providing one of AC or DC electrical power from said extracted energy.