It wouldn't even matter if the air from the engine/prop went over the wings. The prop could be behind the wings like a lot of ultralights and it would still move forward on the treadmill and create lift.I don't think people realize that the engine will generate air over the wings, thus creating lift.
//content.invisioncic.com/y282845/emoticons/confused.gif.e820e0216602db4765798ac39d28caa9.gifI think many of us misunderstood exactly what the experiment was.