Originally Posted by ShoeDLG
What if you were to measure the force on the scale in the case where you place a large plate just above the rotor of the single-rotor helicopter? I predict that you would see a noticeable drop in the force measured by the scale.
I suspect that you would have to fix the helicopter in place for this because a stable hover would be next to impossible to achieve. I predict that the lift generated by the rotor would go up even as the reading on the scale went down.
Kinda needed more hands than I have.
I put the scale on an armchair, and photographed a Shaung Ma 9104 just above the scale, with and without a glass plate above the rotor, I got about the same numbers for the downwash.