Model Airplane Engines - Miniature Airplane Engines - Robert Weinstein. 5 1/2" x 7 3/4", Softcover, 176 Pages. Not a 'hobby' guide, this is a technical treatise on the design and function of Model Engines. Clearly Weinstein is an engineer, possibly even a drone designer during WW2. While the subject is technical, it is presented in a way that doesn't assume the reader is familiar with the engineering concepts presented. There is even a glossary of technical terms in the back. There is almost no information at all on the Internet regarding this scarce book, but I did find a government copyright entry that dates it to 1946. Cover has tears and creases, and is loose but all there. Pages are tight but do show age.