For articles about the Peterborough E20 Scene and the development of Ferry 500 check out https://peterboroughmfc.org/technical-articles.htm

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For the E20 Facebook group go to https://www.facebook.com/groups/252734703568141

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For E20 timers, RDTS and great products got to BMK Free Flight: https://bmks.co.uk/

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For a great selection of E20 kits and products check out J&H Aerospace: https://jhaerospace.com/product-category/free-flight-kits/electric-freeflight/

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For a mine of information of the development of E20, check out the thread: https://www.hippocketaeronautics.com/hpa_forum/index.php?topic=14519.0