The coal hauler mentioned among them

The Coal Hauler was, I believe, Harold Parker's design. Harold was consistently among the top 5 at most competition fun flys. Competition fun fly started to die when the same people (give or take a couple) always took the top 5 spots. They worked hard to refine their own particular plane designs and flying skills. Contrary to another poster, to compete in the top 10 wasn't cheap. The plane used come hi tech materials like arrow shaft control rods and landing gear, carbon fiber wing reinforcement, and kevlar string joint reinforcement. A radio with computer channel mixing and slaving was a must, also. Servos of over 75 oz.in. of torque were needed, and some pilots used even stronger ones. There was also attrition. If a pilot practiced like he needed to compete, he wasted planes, often one a week. Pilots would show up at a 4 event fun fly with 4 planes, and leave with maybe one, until the "same plane you started with" rule started to show up.

Dr.1