Hosting spreadsheets on a website can be a bit problematic. My uploads get converted into the Google Sheets format which permits them to be directly viewed on this website. However, the conversion process is imperfect. Simple sheets are fine, but ones with graphs or embedded images can go awry.
Fortunately, downloads are possible. Simply expand the sheet using the pop-out box in the upper righthand corner of the sheet. If you are logged into a Google account you will have an opportunity to choose the desired format. Microsoft Excel (.xlsx) and OpenDocument (.ods) as well as some non-spreadsheet formats are options. Otherwise, the downloaded spreadsheet will be in its original file format.
Although there are spreadsheets elsewhere on this website, explanatory text accompanies them. These presently have none, but that may change in the future.
The following spreadsheets have been contributed by J. David Kirk. Dave is a professional engine designer with decades of two-stroke experience at several major engine manufacturers. He has written the Two-Stroke Engine Design Handbook and now provides consulting services via Kirk Engines, Inc.