How about two small powerful magnets, one on the inside taped in place and one on the outside? The one on the outside will locate the one on the inside pretty easily. Move it around until you find the sweet spot.
Look for Rare-Earth Circular Magnets like these: http://www.leevalley.com/en/wood/page.aspx?cat=1,42363,42348&p=32065 Ken H. On 5 November 2013 16:04, Rich Knowles <r...@sailpower.ca> wrote: > Peter: you should be able to see where the lead/fibreglass join is on the > outside. If you have a sump at all, and I'm sure you do, your drill should > emerge at or just above the juncture. If you don't like the ⅛" hole, plug > it. No big deal. > > Rich > > On Nov 5, 2013, at 15:55, "Petar Horvatic" <phorv...@gmail.com> wrote: > > Rich, > > your explanation is great, it makes perfect sense. So I got the > drainplug, and I went over there last weekend to look at the possible > location. I don’t have a lot of confidence that if I drill horizontally > sideways, from the lowest point in the bildge, (what I believe you describe > as the 90 deg angle), I will actually end up perpendicular to the bottom > surface on the outside. I don’t know how deep LF38 bildges are but on > 38MkII, bildge is very shallow. If I end up higher then intended it could > be very bad as the bottom profile quickly turns from vertical to > horizontal. My intuition suggests that I might need to drill at like 30 or > 45 deg angle from horizontal in order to end up perpendicular to the bottom > surface on the outside. Maybe I just need to overcome my fear, but I wish > there is a way to find out what lowest point in the bildge projects to on > the outer side of the hull without actually drilling a pilot hole. Maybe > a pic of an actual 38MkII , and not a landfall or ideally a cross-section > drawing of the keel-hull join showing hull thickness would indicate exactly > how to drill. > > > > Petar Horvatic > > Sundowner > > 76 C&C 38MkII > > Newport, RI > > > > > > > > > > *From:* CnC-List > [mailto:cnc-list-boun...@cnc-list.com<cnc-list-boun...@cnc-list.com>] > *On Behalf Of *Rich Knowles > *Sent:* Wednesday, October 23, 2013 4:06 PM > *To:* cnc-list@cnc-list.com > *Subject:* Re: Stus-List Installing a garboard drain plug on 38MkII > > > > Peter: Using a 90 deg. angle drill, I drilled a 1/8" pilot hole out from > the interior of the boat at the intersection of the bilge wall and floor at > the lowest point in the bilge. > > > > I then used a Forstner bit the same diameter as the outside of the flange > of the drain casting to create a recessed hole in the hull exterior the > depth of the thickness of the flange plus a bit for caulking. > > > > Once the outer hole was drilled, I drilled the hole for the neck of the > drain casting deep enough to allow the casting to sit flush with the hull. > I then used a 1/2" drill at an up angle into the bilge floor to create the > water passage from the bilge floor into the casting. Three 1 1/4" #10 flat > head self tapping screws and some 5200 hold and seal the casting in place. > I note that the flange straddles the hull/keel joint with the majority of > the fitting and two of the three screws in the hull. The third screw is in > the lead. No problems to date. That includes dropping and replacing the > keel during my recent post grounding repair. > > > > There are nylon or bronze plugs with hex sockets available if the notion > of drag caused by the protruding square bolt head impeding perfect water > flow bothers the racing mentality at all. Personally, I can't tell the > difference:). One could also cut the bolt head off the threaded portion and > saw a kerf for a large screwdriver in the end of the threaded bit. > > > > That little gadget is one of the best additions to the boat as it ensures > the bilge dries out completely every haul out and stays that way. I leave a > large note to myself to replace the plug in the spring:) > > Rich Knowles > > Indigo > > 1981 LF 38 > > Halifax. NS > > > On Oct 23, 2013, at 15:16, "Petar Horvatic" <phorv...@gmail.com> wrote: > > Does anyone have pics or advice on how best to install a garboard drain > plug. > > Shallow bildge and external lead keel make it pretty difficult to have > something that is flush on the outside yet encompass the lowest point in > the bildge to allow water to drain. > > > > Petar Horvatic > > Sundowner > > 76 C&C 38MkII > > Newport, RI > > > > > > > > > > > > _______________________________________________ > This List is provided by the C&C Photo Album > http://www.cncphotoalbum.com > CnC-List@cnc-list.com > > _______________________________________________ > This List is provided by the C&C Photo Album > http://www.cncphotoalbum.com > CnC-List@cnc-list.com > > > _______________________________________________ > This List is provided by the C&C Photo Album > http://www.cncphotoalbum.com > CnC-List@cnc-list.com > >
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