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Design Spreadsheet
The original balloon design spreadsheet for a natural shape balloon. Once again I have converted this one to metric units although the imperial unit worksheets are still included with this version.

Screenshot of Design Spreadsheet

Enter the desired volume, number of gores, seam allowance and available fabric width and the spreadsheet will calculate the gore pattern for you (including seam allowances).

The pattern is for the classic Sigma Zero / natural shape.

 

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