Second edition of Bill Gunston’s definitive history of the piston aero engine. In the first section Gunston explains very clearly how the various types of piston engines work, and then, in the second section describes how the engines developed, essentially taking the subject chronologically. If you are interested in this subject, and don’t already have a copy of this, you really should treat yourself! 231 densely illustrated pages. Paperback. Sutton Publishing