How can I convert a duct elbow to sheet metal then flatten for patterning?

The question says it all, see enclosed model for reference. Thanks.

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Though and old question nobody seems to have answered. I have attached a pdf file that shows the basic method I use to produce sheet metal models of lobsterback bends that can be flattened. I use Alibre Design software but method will work with other 3D CAD packages.

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