The sound is very familiar to us RC folks. ...are those Graupner propellers? [youtube]http://www.youtube.com/watch?v=rNAPLxZtoPg[/youtube] Read more here: http://www.flightofthecentury.com/
"HOLY CRAP!" safely on the ground...... No reason why they couldnt RC the thing with a sack of potatoes in the seat to simulate a human being sitting there.