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 <<mailto:cnc-list@cnc-list.com>cnc-list@cnc-list.com> wrote:
I used a total of ½â 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
From: CnC-List
[<mailto:cnc-list-boun...@cnc-list.com>mailto:cnc-list-boun...@cnc-list.com]
On Behalf Of Russ & Melody via CnC-List
Sent: Monday, June 26, 2017 9:18 PM
To: <mailto:cnc-list@cnc-list.com>cnc-list@cnc-list.com
Cc: Russ & Melody <<mailto:russ...@telus.net>russ...@telus.net>
Subject: Re: Stus-List 33 mk2 Mast step loads
Hi Greg,
You can research the righting moment, at say 30
- 33 degrees, for various boats in your size
range for a second opinion. The 33-2 is similar
in stability to my 35 mk-1(check diagram in the
Technical Info on Stu's CNC site).
I put the load at about 10,000 lbs, so building
for 12 - 15,000 lbs is not a unreasonable. If
you're going with aluminum only then I would
spec it at 20,000 for a 50% corrosion allowance
and say, "I expect this to last another 20 years."
BTW, check with Rich Knowles on my credentials, if in doubt. :)
Hi Rich, we miss you on the Left Coast.
Cheers, Russ
Sweet 35 mk-1
At 03:15 AM 26/06/2017, you wrote:
Does anyone know what the maximum load would be
on the mast step of the 33? I'm trying to
figure out the psi force for a rebuild
Thanks!
Greg
33-2
Halifax
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_______________________________________________
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>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!
