system 130 with the front vane support 132 removed to expose the vanes 140 supported in the vane system 130 fig4 a illustrates an example of a rotatable vane 140 the vane 140 includes a first arm 142 a second arm 144 a hinge 146 and a flat 148 the first and second arms 142 144 extend away from the circular hinge 146 with the first arm 142 being longer than the second arm 144 each vane 140 has an axis of rotation around the hinge 146 the axis of rotation is offset from the center of the each vane 140 because the first and second arms 142 144 are not the same length in this example the flat 148 is coupled to the hinge 146 and has a rectangle shape the flat 148 and the hinge 146 of each vane 140 interact with a vane connector 136 fig5 on both the front and back vane supports 132 134 in an illustrated embodiment the vane connector 136 is a cavity within the front and back vane supports 132 134 that has a bowtie shape with a circular middle 137 as illustrated in fig5 the hinge 146 of each vane 140 rests in.