Well, I do have both the Fox 35 and ST35, but the ST is more fun and has no way to attach a muffler, so that's the more "nostalgic" combat experience! No wonder the neighbors called the cops when we flew in schoolyards back then. I have had the ST since new in 1960 so it has a special place in my heart and in my hearing loss. It powered a slew of VooDoo's and self designed stuff in its day.