George,
Thanks for asking. The engine is a Ro-Jett 76. The prop is a Bolly 15-4.8 cut to 14". The fuel is stunt 10% and the extra is the design and construction of my No-Clunk tank series detailed with thousands of words on construction and more thousands on the development of the tank with progressive flight experience as the design matured. Actually, that article began on Al's Models Book 2 starting on page 387 running to page 456. (69 pages of photos and text) I'll try to copy it here but I haven't had much luck in posting parts of articles. They're available for twenty bucks including S & H.
Al