I offered to make a VW Wing/Fender patch panel for a friend. It of course took me longer than I thought.
The bottom of one side was in a poor state due to rust, as seen below
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Having taken a paper pattern and cut some steel sheet I stretched the centre in the wheel to get the required crown. I then tipped the curved outer edge which will be turned 180 degrees to give the wheel arch shape
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Comparing to the required profile
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To get the correct folded shape, I welded a steel female die to a pair of vice grips and reprofiled the other jaw using weld bead and a file. This worked fine once sufficient side clearance was put in. I did buy a pair of pipe grips which have removable jaws, I may try these next time.
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Despite using the Lancaster to stretch the flange for the concave part of the curve and shrinking it for the convex part before tipping, I did lose the correct edge profile. I therefore made a pattern/hammerform of the edge shape which I used to correct the patch panel. The hammerform was 6mm steel rod with a 3X20 mm steel strip welded on to stiffen it up.
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I will metal finish the whole wing, when my pal has welded the patch in.
End.