Author A.R. Weyl (Fokker: the creative years, Putnam 1965) says that, while Fokker was a talented and bold pilot, his business character was more flawed. He failed to reinvest war profits back into his factory which consequently struggled to fulfill war contracts as the factory floor was often muddled with prototype development and production taking place at the same time. Fokker distrusted qualified engineers (which he was not), and resented frequent German insistence on carrying out stringent structural tests to ensure prototype aircraft were fit for combat. He could be bad tempered and insensitive, as when he verbally abused his dying designer Martin Kreuzer on the evening of 27 June 1916, after Kreuzer had crashed the prototype Fokker D.I. The rudder jammed, but Kreuzer was able to give a verbal report on the accident before he died. "Fokker hurried to the scene, and shouted reproaches at the mortally injured man". Weyl says this incident was witnessed by Reinhold Platz, who succeeded Kreuzer.