as for example when the wind is in the direction depicted by the arrow 242 for the body of air designated by the letter 34 a 34 in order to present a smaller surface area as a target against which the wind will impact the blades of the liquid rotor apparatus 200 are hinged at their connecting point to the outer cylindrical surface of the hub 210 on fig4 each of the six blades is shown in its two extreme positions in solid lines for situations where the blades 224 are in a position to present a lower surface area profile to the direction of the wind and a second position in dashed lines for the blades 214 when in their position where the direction of the liquid current will propel the blades to rotate the liquid rotor assembly 200 the reference number designations 214 and 224 represent the two different positions for the same physical blade in each of the six blade positions depicted on fig4 each blade has a concave and convex surface and for the blades 214 depicted in dashed lines the concave surface is at 216 and the convex surface is at 218 for the blades 224 depicted in their low surface area profile position the concave surface is depicted at 226 and the convex surface at 228 blades 224 and 214 preferably are semi circular in profile as seen from their sides as in fig4 which gives them a 34 c 34 type shape in.