Abstract: A down-whole fluid drill assembly for boring holes in the earth, having a bit attached to a housing that is rotated by the passage of a fluid through the assembly. The drill assembly comprises at least two helical vanes connected to the first portion of a shaft that is mounted within a first hollow cylindrical housing. The helical vanes are attached to the first housing, defining at least two fluid channels between the adjacent vanes, housing, and the shaft. The drill bit is attached to the first end of the first housing. The second portion of the shaft is rotatably mounted within a second hollow cylindrical housing such that the first end of the second housing is adjacent to the second end of the first housing. The second housing has a fluid passage aligned in fluid flow communication with the fluid channels.