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6 bytes removed, 17:15, 11 March 2014

→‎5.4.1 Design Formulas

|Spiral

|[[File:Spiral.jpg|left|220px|]]

!colspan="3" style="text-align:center" |<math>A =

\frac {\alpha \Delta T}{s} (f^2 - e^2 + 4 r^2 + 2 e f + 2 \pi r f) </math>

|-

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