When the yard did this for me last year, they just used a ~3" hole saw and aimed for a couple inches aft of the rudder stock. You don't really need a diagram because you know where the rudder stock is, and with a small amount of luck will find it on the first try. Do the hole on the upper 1/3 of the rudder, since you don't know how far down the stock extends, but know it's surely present in the upper third. If you're a half inch away from the weld and can't quite see it, you can go digging in the foam with a screwdriver.
It turns out I didn't put pictures of it in my blog post (but there is some discussion of related items, so may still be of interest): https://svviolethour.com/2016/05/03/this-years-haul-out-dropping-the-rudder/ I have plenty of pictures though, I can drop a few in a shared folder: https://drive.google.com/drive/folders/0BxfHpwssU_6NSnFycEtiVW9lTDg?usp=sharing The lower hole was drilled to probe a void we found where the skin had delaminated from the foam. The later pictures show the work the fiberglass guy did filling the holes, void, and resealing around the stock. -Patrick 1984 C&C LF38 On Thu, Mar 23, 2017 at 3:20 PM, <cnc-list-requ...@cnc-list.com> wrote: > From: David Paine <paineda...@gmail.com> > To: cnc-list@cnc-list.com > Cc: > Bcc: > Date: Thu, 23 Mar 2017 18:18:50 -0400 > Subject: Stus-List internal rudder structure? > I know that my rudder leaks and, every year I drill a drain hole to empty > it. Rusty water comes out. Of course I will do my best to seal the > rudder post where it enters the rudder but I am toying with the idea of > cutting into my C&C 33-I's rudder to examine the state of the weld that > holds the internal stainless steel "fin" to the rudder post. I have a > vague idea of what it looks like, but I'd like to minimize the size of the > window that I cut into the rudder skin to examine the weld. This means > that a dimensional diagram that shows the stainless steel internal > structure of the rudder would be ... most excellent! Does anyone on the > list have such a diagram? > > Best, > > David >
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