An air compressor formed of a plurality of collapsible members engaged between opposing rotating side members. The collapsible members alternate between a collapsed state and enlarged state during rotation around the side members which are engaged to polygonal segments of a generally circular rotating frame. Air compressed in each of said collapsible members during rotation toward the collapsed state is communicated to a reservoir in sealed communication with each of the plurality of bellowed members. The reservoir acts to hold-compressed air for use for powering air powered devices.