3 or 4 seconds is not very long to show an overcranked shot but that makes the task far easier. How fast will your camera hoot? You’ll want at least 60fp, 90 would be better because you can always speed it back up to fit.
You’ll want to shoot silk or fine polyester. You’ll want some fans to create the billowing effect.
The rig I’m seeing in my head has the four corners guyed out with fish line so you have some control.
It will always look like a simulation so be prepared for that sytlistically. We’ve been shooting miniatures and trying to make them look big for bout 100 years
This is an effect I’d hire a 3d artist to do for me.
bogiesan