Helmut Fahr,
Interesting post! I can only offer one observation and one already-suggested suggestion.
1. In the 1980's there was on U.S. telly a show called "Airwolf." During the closing credits there was a shot of the 222 cruising low over the water, height and speed undetermined. The camera ship was above and just forward, shooting down and back. A very clear wake was visible on the water for quite some distance, more prominent on one side (advancing, if memory serves) than the other.
2. I would like to see an elevated platform, like an offshore drilling rig with a helideck made of grating (or otherwise porous) materiel well high up off the water. Hovering autos could then be performed and the results quantified versus doing them to solid ground. Should be interesting.