I recently acquired this Manta 19 (1973, #205) in Dragør, just South of Copenhagen. Immediately taken with her beautiful lines and original retro orange gelcoat, I'm trying hard to ignore the facts that the centreboard needs to be replaced, the ballast keel renovated and all deck hardware rebedded ... and who knows what else. But she's worth it, isn't she?
On a German bulletin board I found a technical drawing of the centreboard by user "Soros", that I've used to make a 6,5 mm plywood prototype, that seems to fit like hand in glove: https://www.segeln-forum.de/board20-vorstellungen/board22-ich-bin-neu-hier/56892-manta-19-berlin/. The dimensions differ a bit from the drawing of "Sophie"'s centreboard but was very easy to get right - and it seems to be spot on.
Unfortunately, the drawing in the thread can only be displayed after you have registered as a user - and I don't want to step on any toes by making a copy to put on this site.
The brand new water cut steel centreboard arrived yesterday. A little warped but nothing that couldn't be set straight by two skilled metal workers rolling, turning and tweaking for 10 minutes. Sanding, priming, undercoating, antifouling it will take some days. Meanwhile polishing, waxing as well as varnishing a few things too. Now setting my sight on election day, June 5th, as the last day before launch. Getting quite used to small setbacks, like the Sunbeam and Manta logos from the sticker-service in Germany, that seem to have decided that Hamburg is a nice place for a week off on a shelf somewhere.