Final post of today! - How to make a turn fin. My way anyway...
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.063" (1.6 mm) thick 7075-T6 aluminium sheet. Printed out copy of the turnfin to be made, spray glued and attached to the plate.
![](http://3.bp.blogspot.com/_1EKtN-2yN0w/TCjeU_GBsuI/AAAAAAAADxg/mU5c-zmuwn4/s400/11682-fena.jpg)
The center of the holes are punched and the outlines are scribed with a hobby knife (that can be excluded also as you can make it ready with then paper still on the aluminium).
![](http://1.bp.blogspot.com/_1EKtN-2yN0w/TCjeRCKil7I/AAAAAAAADxY/UlxDaoblVPg/s400/11683-fena.jpg)
Close up.
![](http://4.bp.blogspot.com/_1EKtN-2yN0w/TCjeNcBszHI/AAAAAAAADxQ/NdFFk4vno7g/s400/11684-fena.jpg)
3.5 mm holes are drilled and the two bends are done. Now it can be cut-out. I do it in my band saw and then shape it with a disc sander and the Dremel with a sanding drum...
![](http://4.bp.blogspot.com/_1EKtN-2yN0w/TCjeIkKH4LI/AAAAAAAADxI/L8McYbtQKxw/s400/11685-fena.jpg)
The disc sander is used to make the sharp edge. Make it almost sharp and make the last bit with a file. Its very easy to go too close to the edge so to speak with the disc sander. I also sand the turnfin with a sanding block and sandpaper making sure all edges are sharp that will be in the water.
![](http://2.bp.blogspot.com/_1EKtN-2yN0w/TCjd-ScGCLI/AAAAAAAADxA/oZtlTyv-5dU/s400/11686-fena.jpg)
Done. :)
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