Time-Compression Technologies Magazine Archive 2002 (and backfills for previous years)
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Author Nick Reffold
Source Time Compression Technologies. v7 n3 May, 2002, pp 21-3
Abstract Reverse engineering is a design process that starts by capturing the original form, but uses the data as a starting point to replicate the required function using contemporary methods and tools. The goal of a restoration project involving a vintage de Havilland Vampire jet fighter was to return it to flying serviceability for display at an air show. A number of components were badly corroded, including the lower bracket for the ejection seat main gun tube. The bracket was originally made of a very low-density magnesium alloy. The mass of any item within the airplane originally would have been an important design criterion because maximum lifting ability should be devoted to carrying payload, i.e., weapons and fuel. Since the aircraft's original military role was no longer relevant, it was decided that a heavier material should be used - an aircraft-grade aluminium alloy that would be less susceptible to corrosion and with the original dimensions, it also would give a much stiffer structure. The or iginal bracket was digitized using a FARO arm. When design criteria are changed, and the methods and final processes are different from the original, a replica results that performs the same function, but may have a considerably different form. XX
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