US Patent 7429018 Variable fluid intake with ramp and inflatable bag

Methods and apparatus for a fluid inlet according to various aspects of the present invention comprise a housing and a ramp at least partially within the housing. The housing and the ramp define a passage through which air may flow to the engine and a cavity on the opposite side of the ramp from the passage. The ramp is moveable within the housing to change the size of the passage and the cavity. The system further comprises a seal substantially disposed across the cavity.