Classical Engine Design Calculations Using Spreadsheets. A.C.Erskine, R.Ali, G.G.Lucas, A.Hughes.Classical methods of design and analysis of engine components are in danger of fragmentation and falling into disuse because of their ad hoc development and lack of continuity of personnel. It is argued that although advanced and comprehensive numerical methods of analysis have recently become available to engine designers, classical techniques still have a useful role to play in the design office. To retain their continual use and to enhance it, it is necessary to translate and integrate the existing classical techniques into user friendly computer software. This has been achieved in a software package, CEDS, discussed in this paper. The software is quick and easy to use allowing rapid parametric studies in the early stages of design of components.