Not too much has been said about what Big Jim accomplished.
He designed the Patternmaster. Windy, who was a good friend of Big Jim, used the Patternmaster numbers on many of his own designs. As I remember Big Jim designed the Bj (Big Jim) which was a .60 powered stunter. (might have been the Patternmaster) He also designed the LJ (Little Jim, named after his son) It was a .46 powered stunter.
He modified Super Tigre V .60's into stunt engines that are still legendary. They had a distinctive growl when they ran. He also reworked Super Tigre .46's.
He also built custom fuel tanks which were quite pricey, and worked superbly.
He had an edetic memory and was a walking encyclopedia of aerodynamics and stunt.
He had a people type personality and was a joy to talk to.
He had a stroke a few years ago, and dropped out of sight.
He was a Man's Man, like George Aldrich.