Ty: That is an interesting finding that you made. Since Walt was approached by Scientific in 1948 to design models, I would assume that Mr Spampani had designed a few of the models at that time. You have this earlier version, with the much thicker wing, and different fuselage, too. Most of the models that Walt designed indeed were original both in name and appearance, but the second "Walt" Little Devil update continued the name, and some of the design.
There were some '40s kits, usually larger than the Logs that came later, that had built up wings or built up fuselages, or both, that were made by Scientific before Walt. Two that come into mind were the Kingpin and Atomic (a true .29 powered Team Racer). Walt continued these names and much of the "styling" when he downsized them as 1/2A Logs.
Robert: Please note that the Red Devil and Little Devil were two different models. No question re the Walt provenance of the Red Devil. I restored one a few years ago for Speed at Musciano, by the way. Nice flyer.
Currell