Thomas;

Yes. For our speeds and pressures the air can be treated as essentially incompressible.  So expanding the flow area by factor of 4 will reduce the average flow velocity by factor of 4.  What the flow profile will be depends on your duct design.

Al G

Subject: [FlyRotary] Air Flow Question

If I have a volume of air entering my scoop at 180 kts and expand the volume of the chamber by 400% can I expect the speed of the airflow to drop to 45 kts at that point?

T Mann