You might find this site interesting. Appears to have a lot of technical information on aircraft engines, from the early 1900s up to the 1940s.
Ooh. That calendar might solve one of my holiday dilemmas. I know exactly diddly-squat about airplanes, but is this the kind of gift that might be suitable for a guy who asks to be taken to the Air Force museum in Dayton for his birthday every year?
Santa thanks you very much. I had not even known about this one, but it will have pride of place in my lonely little cube next year.
Yup, especially if he’s an engine nut.
Mrs. Stone has been given another Christmas present suggestion.