The unique Christie suspension system took the tank world by storm in the early 1930s, and tanks equipped with it remained in production until the very end of WW2. Yet, his home nation, the USA, entered the war with bogie wheeled volute sprung tanks, not the big-wheeled coil-sprung speed demons that Christie was building. This was the result of a multi-year testing process, comprising more Christie-type vehicles than not, while Christie wrote himself out of the picture for most of it. By reference to test reports, we can see what happened. Post-COVID-Travel-and-Scout Car Fund: Patreon: https://www.patreon.com/The_Chieftain Direct Paypal https://paypal.me/thechieftainshat Subscribestar: https://www.subscribestar.com/the_chieftain