I did meet Claire Sieverling. Following his control stunt career, he became involved in big time RC. I think it was RC Scale
Many decades ago I was flying a CL stunt demo at some RC event in the Phoenix area. Following the demo, Claire approached me and introduced himself. He was surprised and pleased I knew of him. He told me he hadn’t seen a competition like CL stunt pattern in many years. He was gracious and friendly. I have a weak memory but I recall Claire as a classy fellow. RIP Claire Sieverling