Skip to first unread message
Daniel
Nov 23, 2020, 5:27:19 PM11/23/20
to Cape Henry 21
An ingenious system.
On Monday, November 23, 2020 at 11:36:04 AM UTC+8 JOELAN wrote:
Cyrus Jordan
Jun 9, 2021, 4:28:42 PM6/9/21
to Cape Henry 21
I've purchased salvaged shotgun shot to use as ballast and started to plan out a process for installing it. If anyone who used this method of ballasting has any advice about what worked for them and what didn't, I'd be very appreciative. I'm thinking of using polyester resin rather than epoxy to create the slurry as a cost savings approach; any caveats about doing this would be much appreciated. And just practical advice such as how much slurry you mixed up at a time or any other process input would be very appreciated. Thanks in advance for any input.
Cy Jordan
Ron Jesche CH21' Sealion'
Jun 9, 2021, 5:12:34 PM6/9/21
to Cape Henry 21
Hi Cy,
I also used salvaged shot and it is a great way to get the ballast into awkwardly shaped spaces.I used epoxy and you really don't use as much as you might expect. I filled the compartment with lead and then kept adding the resin and mixing it until the lead was just coated. No need to flood it you only need to glue the particles together and the resin will naturally make it's way down to the hull planking glueing the whole lot together. You could use polyester but would need to be careful as it generates heat as it sets, leading to cracking and some nasty fumes. I would stick with epoxy as I was surprised how little you need to glue the shot together. I used an old screw driver to mix it all together.
Ron
Cyrus Jordan
Jun 9, 2021, 5:43:42 PM6/9/21
to Cape Henry 21
thanks Rpn. Did you line the inside of the hull and sides of the centreplate trunk with glass cloth first?
Cy
Ron Jesche CH21' Sealion'
Jun 9, 2021, 6:09:00 PM6/9/21
to Cape Henry 21
Yes I did Cy. This is not an area you have access to again so better to be safe.
Your cockpit gutters look good. They are a lot of work but worth it. I have never had a drop of water in mine.
I just received an email from Gary Herbertson re my post earlier. Gary, your post came directly to me rather than the group. There are two options to reply to a post, If you want to reply to the group click on reply to all. If you click on reply to author it only goes to that person.
Ron
Dudley Dix
Jun 10, 2021, 11:23:19 AM6/10/21
to Cape Henry 21
It is not a great idea to use polyester resin, it doesn't bond as well to anything as epoxy does and may introduce unexpected issues. As Ron says, it does not need a massive quantity of epoxy to do the job. If your lead shot is all the same size, the shot will occupy 74% of the space. If you fill all voids with epoxy it will be 26% of the total volume, less if you only coat the shot as Ron did. If your shot is of varying sizes it will compact better and fill even more space than 74%.
DD
On Wednesday, June 9, 2021 at 5:12:34 PM UTC-4 Ron Jesche CH21' Sealion' wrote:
Cyrus Jordan
Sep 13, 2021, 5:23:16 PM9/13/21
to Cape Henry 21
I'd like to remove the two vertical supports for the centre plate trunk that rise from the bulkhead at station 5 - it'll make glassing in the bilge to hold ballast easier and add a little extra leg room in the cabin. I'm planning on putting some glass tabbing at the joint where the centre plate trunk abuts the bulkhead at station 4 under the compression post to compensate for any loss of support if I remove the vertical supports from bulkhead 5; and I'm putting in a solid lining of heavy glass cloth on the garboards, floors and the lowest 150 mms of the centre plate trunk to hold the ballast. I'd very much appreciate any input from others.
Thanks,
Cy Jordan
Dudley Dix
Sep 13, 2021, 10:37:07 PM9/13/21
to Cape Henry 21
Cyrus, I am going to be pretty blunt in my response. This is structure that is on the drawings for a reason. First, why do you ask a question like this of the group and not of me directly by email? Second, there may be other structure in the boat that you feel is in the way of comfortable sleeping or some other aspect of living aboard. You can't just leave it out or cut it out for comfort reasons if you want a structurally sound boat.
Dudley Dix
Dudley Dix
Sep 13, 2021, 10:56:00 PM9/13/21
to Cape Henry 21
Cyrus, when I study your photo carefully, it looks like you have cut away much of the vertical edge of that plywood bracing the side of the casing. That should not be cut away, it should be continuous support to the casing. If you have cut it away you have changed the support from spread over the height of the brace to a point load in the middle of the panel. It may be an optical illusion but, if not, please fill in that gap.
Dudley Dix
Cyrus Jordan
Sep 14, 2021, 2:03:34 PM9/14/21
to Cape Henry 21
Mea culpa - Thank you Dudley for setting me straight. I didn't realize that the bulkhead had been modified. I'm not the initial builder. i acquired the partially built boat when it came with a house that my daughter bought. At times during the project I've wondered if I should have started with a new kit....rather than attempting to renovate what had already been done. But I like fixing things and was and still am impressed with Dudley's design.
And thank you Pablo for your advice. I'm going to add additional strength to the uprights as Pablo did now that I understand their function. As Dudley noticed, quite a bit of the support had been removed which led me to think that their purpose was to ensure that the centre plate trunk was properly positioned during construction and not to be a permanent supportive structure.
Cy
Reply all
Reply to author
Forward
0 new messages