Rare 1927 Wright Aeronautical Corporation Whirlwind Engines Promotional Catalog. Really hard to find. 48 pages plus covers. A promotional catalog describing the advantages of the Wright Whirlwind aircraft engine. Has descriptions and photos of dozens of planes of all types with the Whirlwind. From Air Mail to passenger to military. Purchased a a local estate auction, it has been enjoyable to read. All pages present and attached, in reasonable good condition. Perfectly readable and in no danger of coming apart. Thanks for looking and I am glad to answer any questions you may have. Payment is required within 24 hours.