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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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