Glad to explain, John. We static tested The Blue Flame on the Great Lakes Dragaway drag strip in Union Grove, WI. A steel post was driven 12 feet into the ground at the far end of the track in the pit area. It is still there. Dr. Carl Uzgiris (IIT) fabricated the thrust (strain) gage and recorded the readings over two test sessions in August 1970. Because Goodyear imposed a 700 mi/h maximum “speed limit”, we had to detune the rocket from 22,000 lbf to 15,000 lbf. Some rocket system modifications were required after the first tests, then we were off on our Bonneville adventure.