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Computerisation of Classical Engine Design Techniques using Spreadsheets. A.C.Erskine, R.Ali, G.G.Lucas, A.Hughes. Traditionally, engine components have been analysed using models with sufficient simplification to enable solutions to be calculated by hand. With the increasing availability of powerful computers these ‘classical’ techniques are being forgotten in favour of more accurate, but more complex and time consuming, finite element methods. This paper discusses the benefits of using classical analysis techniques and describes a user-friendly, spreadsheet based system for their application. The Classical Engine Design System (CEDS) is quick and simple to use making parametric studies in the early design stages easy. These can be used to evaluate the feasibility of a design in order to justify time and money spend on further, more detailed analysis. Microsoft's Excel spreadsheet package, running on a P.C., has been used as a basis for the software.