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_BY2PR02MB458E0206231C27457085F
24B1DC0BY2PR02MB458namprd_"
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
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