According to the 37+/40 build specs , the rudder post is supposed to be 3.15” OD 1.97” ID SS bar.
Though mine is closer to 3” OD I suspect it is still hollow with an ID of ~ 1.75” or so. That’s still plenty of steel to drill through, but way less hassle the hauling and dropping the rudder. The adventure continues... Tom Buscaglia S/V Alera 1990 C&C 37+/40 Vashon WA P 206.463.9200 C 305.409.3660 > On Apr 19, 2020, at 4:30 PM, cnc-list-requ...@cnc-list.com wrote: > > Message: 8 > Date: Sun, 19 Apr 2020 16:24:46 -0700 > From: Bryan Colwell <bhcolw...@gmail.com> > To: cnc-list@cnc-list.com > Subject: Re: Stus-List Linear Auto Pilot install 37+/40 > Message-ID: > <cal5xpk4pbbp5bcguk-zq7menmrkk72ns6khunbe5js7nnnr...@mail.gmail.com> > Content-Type: text/plain; charset="utf-8" > > 1991 34+ post is hollow. Way too heavy if it was solid. > >> On Sun, Apr 19, 2020 at 4:17 PM Josh Muckley via CnC-List < >> cnc-list@cnc-list.com> wrote: >> >> Good lord! Drill through 3 inches of stainless steel! Nope! That one is >> going to the machine shop for me. I don't care if it is a cobalt bit and >> guided. The machine shop could put in a keyway while you have it out >> instead of a hole. >> >> Josh Muckley >> S/V Sea Hawk >> 1989 C&C 37+ >> Solomons, MD >> >> On Sun, Apr 19, 2020, 19:04 Bryan Colwell via CnC-List < >> cnc-list@cnc-list.com> wrote: >> >>> Tom, >>> >>> I had the same issue on my 34+, no keyway. I called Edson and they said >>> you must drill through the post. The Edson arm has a hole on one end which >>> guides the drill to the opposite side. Then you finish by drilling through >>> the bronze arm for the bolt. Be sure and use a cobalt drill bit to get >>> through the stainless rudder post. >>> >>> Bryan Colwell >>> >>> On Sun, Apr 19, 2020 at 3:19 PM Tom Buscaglia via CnC-List < >>> cnc-list@cnc-list.com> wrote: >>> >>>> I am moving forward with the below deck linear drive install. We put in >>>> the structural support and then exposed the rudder post. However a few >>>> oddities. >>>> >>>> First, in spite of the build plans calling for an 80mm diameter rudder >>>> post it is, in fact, 75mm. And, although the Images that Josh posted if >>>> his install show a keyway on his post, mine does not have one. >>>> >>>> I?ll check with Edson to see what they recommend for attaching the >>>> tiller arm. >>>> >>>> Sigh... >>>> >>>> Stay safe all. >>>> >>>> Tom B >>>> >>>> Typoed from my iPhone >>>> >>>> Tom Buscaglia >>>> Alera 1990 C&C 37+/40 >>>> Vashon Island WA >>>> O 206.463.9200 >>>> C 305.409.3660 >>>> Skype - thombusc
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