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...they are similar to tentacles that hold the vehicle back like a parachute.
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I think of myriad little fingers clutching anywhere they can get purchase, but tentacles are cool.
Calculating power drawn is one step removed from cubic feet per minute. I understand that a 1600 Type I moves 1500cfm. That volume (plus thermal expansion) is available at the difusser area for active management of the airflow.
Tufts vs streamlines: The best tools are
Schielren photography and advanced CFD (using OpenVDB and
Micropolygon Displacement.