Versions of the Fluid Space Drive.

V1 The original idea, propellers in space (see)

V2 Some experimentation showed the addition of an air brake improves the propulsion effect (see)

V3 Further experimentation demonstrates propulsion can be obtained without a propeller (Joel Mayer named this version the bumblebee drive because it shouldn’t work but does) (see)

Laminar Flow Fluid Space Drive (not tested)

All versions make use of how a gas behaves in a Turbulent Flow environment, but it may be possible do devise a method of propulsion using Laminar Flow (see).