[Public-List] Mast Step Analysis for After Thanksgiving Meal

[Mike Lehman via Public-List]

Towney did the same repair to Skybird #550 many years ago.

On Wed, Nov 23, 2016, 10:03 AM Jason S <kk4mex at gmail.com> wrote:

> I would absolutely agree with Mike but even with mast moved forward on the
> step as far as possible it is not even close to being centered on the
> orginal support beam, at least not on my liner boat.
> I will also add that I believe the orginal  pad molded int the deck is not
> sufficient enough to spread load out over the beam. It is just a smidgen
> over 5" wide. That alot of force to concentrate on such a small area,
> especially when core below it fails.
> I am in the process of building a new much wider molded step the will help
> spread load out. I got the idea from Jean-du-Sud when I was aboard her last
> year.
>
> On Nov 23, 2016 9:52 AM, "Mike Lehman via Public-List" <
> public-list at lists.alberg30.org> wrote:
>
> Skeep
>
> As a general setup, make sure the base of the mast is as far forward on the
> step as possible, to put the mast over the beam as much as possible.
> Otherwise you can end up with too much weight on the deck behind the mast
> and cause a depression in the deck. When setting up the standing rigging,
> the first step is to make sure the head of the mast is directly over the
> top
> of the mast (achieved by using the main halyard as a plumb bob). Tension
> the
> upper shrouds with equal tension all the way around to about 600 pounds.
> Then tension the forward lowers until there is an inch or two pre-bend in
> the mast at the spreaders (that helps to reduce weather helm). Finally
> tighten the aft lowers to just enough to take the slack out of them. Go
> sailing, check the rig under load and tweek the tensions as needed.
>
> -----Original Message-----
> From: Public-List [mailto:public-list-bounces at lists.alberg30.org] On
> Behalf
> Of Bill McCoy via Public-List
> Sent: Wednesday, November 23, 2016 6:29 AM
> To: public-list at lists.alberg30.org
> Subject: [Public-List] Mast Step Analysis for After Thanksgiving Meal
>
> While cold winds whip into your Thanksgiving dinner and relatives
> accumulate
> and settle back into the couch for dreary sleep and countless football
> games, here are a few photos for your consideration.  And I welcome your
> advice on positioning the mast from what you can determine from these
> photos:
>
>
>
> http://s1358.photobucket.com/user/Skeep575/library/Alberg%2030%20Nautica?sor
> t=3&page=1
> <http://s1358.photobucket.com/user/Skeep575/library/Alberg%2030%20Nautica?sor%0Dt=3&page=1>
>
> [
> http://i1358.photobucket.com/albums/q763/Skeep575/Alberg%2030%20Nautica/sto
> ry/thumbnail.jpg
> <http://i1358.photobucket.com/albums/q763/Skeep575/Alberg%2030%20Nautica/sto%0Dry/thumbnail.jpg>
> ]<http://s1358.photobucket.com/user/Skeep575/library/Alberg%
> 2030%20Nautica?sort=3&page=1>
>
> Alberg 30 Nautica by
> Skeep575<
> http://s1358.photobucket.com/user/Skeep575/library/Alberg%2030%20Na
> utica?sort=3&page=1
> <http://s1358.photobucket.com/user/Skeep575/library/Alberg%2030%20Na%0Dutica?sort=3&page=1>
> >
> s1358.photobucket.com
> View the full album on Photobucket.
>
>
>
>
> I am troubleshooting my Alberg's mast position, taking into consideration
> all the support issues, and having no idea to work with am applying what I
> have read to what I have on deck.  Observation:  1) mast appears to have
> some rake in the top which also may be exerting unnecessary pressure on aft
> of step, 2) step appears to have pressure aft although main part of mast is
> on the support, 3) possibilities are limited to moving mast 1/2 inch
> forward
> to ease aft pressure.  Advise.
>
>
> Thanks and Have a Great Thanksgiving!
>
>
> Skeep
> Hull 614, Nautica
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>
> --

><((((°>´·.,.·´´·.><((((°>´·.,.·´´·.><((((°>
Mike Lehman