ORIGINAL: gamerboy08046
I can tell you exactly what it is its a hobbico 40 size Extra 300S. S stands for shoulder wing. I had one years ago so I know exactly what it is
I don't doubt that you may have had one, but here is a photo of my Great Planes 300s. As you can see the wing is down lower, and the "S" does not stand for shoulder mounted on my particular Extra 300S.