Well you need to sleeve the 2 keel bolts for keel maintenance/removal anyway, so this requires a post or tube regardless, prior to the pour. Only other thing I would add (and it's a no-brainer) is to ensure that the 'floor' (large transverse rib) you cut under the mast step is adequately reinforced, both transversely and longitudinally. the once continuous glass spanning the keel stub isn't continuous any more so you want to rebuild/reinforce that. Again, that's pretty obvious I think. This is part of why I switched to very heavily glass filled epoxy at the top of my keel fill, and then built out a tapering cross of biaxial stitch mat and height modulus carbon spanning the whole region. Have flogged the boat hard this spring and am looking forward to lifting the sole and inspecting in October.
Dave Sent from my iPhone > On Jun 28, 2017, at 7:38 AM, Greg Sutherland <bluenosesail...@hotmail.com> > wrote: > > I'm loving your input gentleman, > > I agree completely. I come from a construction background so plan on using a > cement type of mortar used for anchoring large industrial equipment. Once > fully cured it has a load rating of 8100 lbs/sq in, doesn't shrink and is > unaffected by water. I was certain the loads wouldn't exceed that but wanted > to make sure. My plan going forward once excavated was to pour 4-5 " of the > mortar to level up the base and then fabricate a steel post with a bottom and > top plate with a hole for the forward keel bolt to hold everything in place > and then glass in the top. I was tempted to just fill the entire cavity with > the mortar and move on but thought the compression post was a better > plan.........until I read what your father said. Maybe he's right, top it up > and call it a day. > > The mortar I plan to use is called Sikagrout 212 but states that after 6" of > depth you need an aggregate filler. Maybe something with less weight could be > used to retain strength in the grout and filling the cavity would definitely > be the way to go. > Thought? > > Greg > > > On Jun 28, 2017, at 7:35 AM, Dave S via CnC-List <cnc-list@cnc-list.com> > wrote: > >> Greg - agreed with Russ (and Joe.) When I did mine I briefly went down the >> calculation rabbit hole, looking at the properties of materials etc and I >> realized there was no way for me to calculate the hypothetical combined load >> of keel bolt torque, mast/rig, and one bolt's worth of bashing a rock at >> 4kts. My brain elected to look at the original construction and make it >> stronger (compression posts, epoxy, carbon fibre....) and move on to other >> projects. I used glass and carbon fibre (recommended by the local >> composites purveyor) instead of AL as others have done, but, same idea. >> My dad (builder of many boats- now in NS) suggested concrete as fill and he >> was probably right. >> >> Dave >> >> >> >> ---------- Forwarded message ---------- >> From: "Russ & Melody" <russ...@telus.net> >> To: cnc-list@cnc-list.com >> Cc: >> Bcc: >> Date: Tue, 27 Jun 2017 21:52:15 -0700 >> Subject: Re: Stus-List 33 mk2 Mast step loads >> >> Hi Dave, >> >> Watch those units. >> 4000 PSI on a 6" x 8" mast step plane is out of this world for a 33 foot >> boat. >> When I did the mast loading while designing the rig of my old 60' cruiser it >> was 100,000 lbs and he's telling you it's twice that?? >> >> I would go with Joe's suggestion of 1/2" aluminum plate and move on to other >> projects. >> >> Cheers, Russ >> Sweet 35 mk-1 >> >> At 08:24 AM 27/06/2017, you wrote: >>> Content-Language: en-CA >>> Content-Type: multipart/alternative; >>> >>> boundary="_000_BY2PR02MB458E0206231C27457085F24B1DC0BY2PR02MB458namprd_" >>> >>> Thanks everyone for the info. I spoke with Danny from Klacko spars >>> yesterday and he's certain that he would have installed my original mast in >>> '87. He figures even when falling into a wave with full sails the forces >>> wouldn't exceed 4000 psi. Seems light to me but who am I to argue with him. >>> I thought I notice Mr. Knowles at the club on the weekend so I'll >>> definitely run it past him - thanks for mentioning that. >>> >>> I have the entire mast step "excavated" to the keel and am starting the >>> rebuild. Can't wait for this one to be finished! >>> >>> Thanks! >>> Greg >>> 33 mk2 >>> Halifax >>> >>> On Jun 27, 2017, at 10:52 AM, Della Barba, Joe via CnC-List >>> <cnc-list@cnc-list.com> wrote: >>> >>>> I used a total of ½†aluminum on mine when I rebuilt it. It looks >>>> about 20 times stronger than the original was too. >>>> >>>> Joe >>>> Coquina >>>> CC&C 35 MK I >> _______________________________________________ >> >> This list is supported by the generous donations of our members. If you wish >> to make a contribution to offset our costs, please go to: >> https://www.paypal.me/stumurray >> >> All Contributions are greatly appreciated!
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