Mike, Marlo's windtunnel vehicle was a beautiful and "dimensionally accurate" hand carved four foot long wooden model built by the actual race car builder, Jim Hume, who
as I have mentioned before has (or had ?) some of His wooden "Fabrege'" egg's displayed in the Smithsonian Museum.
Jim carved a second "bottom half" of the model which was mated wheel to wheel with the full model (inverted) for some if not all of the tests. The model was painted with a liquid chalk like substance which dried in the tunnel and provided a excellent footprint to follow.
The wind tunnel was at a small Engineering College in the Seattle (think Boeing) area. I believe their are some pictures on the Target 550 site.
p.s. Rumor has it that the Race Car has a new driver and it aint a He...................
"One Run", out.........................................................