This zip contains a spreadsheet for calculating the aerodynamic centre of a wing. It is in 3 formats: AeroCentre.wk4 Lotus 1-2-3 AeroCentre.wks Microsoft Works AeroCentre.xls Microsoft Excel Split the wing into up to 4 trapezoidal panels - an example is sketched in AeroCentre.jpg. This sketch corresponds to the example data in each spreadsheet. NB My original spreadsheet is in Microsoft Works (.wks) format. The export to the other formats is by no means problem free. I have taken reasonable care that the exported versions work properly, but please let me know if there are problems. For the theory behind the calculations, see "Model Aircraft Aerodynamics" by Martin Simons. Please let me know if you find this spreadsheet useful. John Hunt 17 April 1999 jrhunt@iee.org