Patent ID: 7162763

Claim:
A cleaner adapted to travel adjacent to a pool wall surface for collecting debris, said cleaner comprising: a housing having a wall, said wall including a portion having a substantially planar outer surface positioned for placement close to said pool wall surface; said housing wall portion including a water inlet orifice defined by a peripheral edge; said housing defining a water outlet; a passageway in said housing coupling said orifice to said water outlet; a hose for applying suction to said outlet to draw a water stream through said orifice into said passageway; a turbine mounted in said passageway adapted to be driven by said water stream; and wherein said peripheral edge defines an orifice area A 1 and said water stream contracts downstream from said edge to a cross-sectional area A 2 ; and wherein said peripheral edge defines an upstream edge diameter D 1 which tapers outwardly downstream from said upstream edge.