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Old 04-15-19, 10:21 AM
  #25  
tcs
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Join Date: Mar 2007
Location: Parts Unknown
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Bikes: 1980 Mike Melton, 1982 Stumpjumper, 1982 Santana, 1984 Alex Moulton AM, 2008 BikeFriday tikit T-11, 2010 Dawes Briercliffe, 2017 Dahon Curl i5, 2019 Surly ˝DT14

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Here's a cross-section of a turbine blade superimposed on a Dahon Curl image:



Why is the Curl designed this way? Well, form follows function, and it achieves a notably smaller fold:



BTW, in a detail of this image, you can compare the smooth welds of the Dahon with the lumpy braze work on the Brompton:

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