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This site spends a great deal of time on the history of aviation and yachting.  But we know that many of you are involved in the design, construction, maintenance and use of airfields and waterways.  This part of the site is for you: a collection of documents and some software to help you in your work and, sometimes, recreation.

We trust that it will be a useful resource for you. For your convenience the pages in this section are as follows: