Greg, I cannot speak to the structural analysis involved but I would not be at all comfortable leaving that space unfilled. Not sure the small benefit of departing from the designer's intent is worth the risk... just an opinion. And the heat thing is minimized by mixing smaller batches - less concentration, more surface area.
Dave Sent from my iPhone > On Jun 28, 2017, at 7:07 AM, Greg Sutherland <bluenosesail...@hotmail.com> > wrote: > > Hey Russ, > > The sika has amazing freeze thaw properties and the reason I began looking > outside of the standard epoxies or resins was due to my general lack of > knowledge and also a bit concerned with the depth of material needed, and the > heat generated while kicking off and curing. I was surprised when Dave went > in that direction because I was under the impression the boat would catch > fire or in the very least the end result would be brittle. After reading his > process last night I think his success was using less catalyst but it's all > foreign to me so I have no clue. (Awesome job btw) > After a bit of thought, would it really matter if I left that area open and > not fill the entire cavity? If I have a substantial compression post that is > held fast around the forward keel bolt to keep it in position, couldn't it be > open like the bilge on the other side? As long as the top of the area is > secured and glassed back into the structure around the keelbolts with the > steel plates I think it should be fine. I also contemplated drilling limber > holes from that cavity into the bilge so that if and when water gets in, it > would also drain out. > > On Jun 28, 2017, at 9:36 AM, Russ & Melody via CnC-List > <cnc-list@cnc-list.com> wrote: > >> >> Hi Greg, >> >> If you want to spend extra... we used Pilgrim Magmaflow epoxy grout under >> the frame of the turbogenerater. Excellent flow characteristics if there is >> an awkward cavity to reach. It might be better than traditional grouts >> during freeze cycles if there is water present. >> >> A little over done for the job perhaps but you will smile. >> >> Cheers, Russ >> Sweet 35 mk-1 >> >> At 04:38 AM 28/06/2017, you wrote: >>> Content-Language: en-CA >>> Content-Type: multipart/alternative; >>> >>> boundary="_000_BY2PR02MB458EF9750B90832967E2CBFB1DD0BY2PR02MB458namprd_" >>> >>> 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 ½â€ aluminum on mine when I rebuilt it. It >>>>>> lookks 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! >>> _______________________________________________ >>> >>> 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! >> _______________________________________________ >> >> 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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