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Once you have the template - the easiet way to go is to epoxy fair an exact profile narrow band, top and bottom of the rudder. Then fair between the two with a straight edge. The trailing edge is not so important - and if made simply from timber this trailing edge would be too thin, strength wise. If you are epoxy fairing timber, then the edge could be solid epoxy
|A Sad Looking Rudder - but a nice piece of wood !
Well - this is the rudder as it is. Not too pretty a sight. The actual gudgeons and pintles are fine - heavy cast bronze - and the stainless continuous bar fitment is sound, though would be better fixed than just with split pins - maybe just a small through bolt at the top to avoid any possibility of the bar dropping.
This make much more sence - it's a constant line aft and generally slopes aft, although is a parallel shape.
I'm considering modifying this board - essentially by planting in 4 x 40mm reversed strips of mahog straight down through the middle, where the max thickness is. Then I can reprofile the leading and trailing edges easier - probably with epoxy fairing. I can also tuck the rudder in somewhat more to the transome.
There is an exellent profile freeware program - search 'Nacagen'. The program opens in a dos window - but gives you all the thicknessing measurments. I'm a bit foggy with dos, ie. I'm not sure how to print a dos window - if you can ?. However, the 'print screen' button trick works - simply press 'print screen' - open an image editing program such as photoshop, open a blank file, then 'edit/paste'. Left is an example - based on the NACA 0012 profile - which trial an error gave results for my present thickness of 35mm on a chord ( width) of 13.5 inches.
Once you have pasted it into photoshop - you can invert it, as it is here ( it pastes as a black dos window with white text ) - then I placed it into an A3 Illustrator doc so I could print it out on two A4 sheets full size to use as a template. You could of course draw it up from the info - but it's all in 100ths inch !
The leading edge is the important bit - apparently and the position of the thickest section.