Paul MacCready (at right with video camera), with a van, crew and pterosaur model. ?Lacking a wind-tunnel, the model was driven up and down a street in Simi Valley. MacCready's son Tyler (in the red helmet atop the van) and Aerovironment staff hang from the sides, observing while instrumentation measures the aeronautic parameters.?The?wing-flapping 1/2 scale model mimics the 11 m wing-span 'Quetzalcoatlus northropi' (QN), largest animal to have flown on earth, extinct for 65 million years. QN, l