[Public-List] Public-List Digest, Vol 2531, Issue 1

[Kristian Larson]

Hey there,
I have the same problem with the mast step having broken ears. Poor washers
and thin aluminum are probably to blame. The previous owner gave me a new
cast aluminum mast step with the boat but it is not flat and has voids from
the casting process which are near the ears. The bottom plate is to thin to
machine flat so I have been looking at other options like cutting off the
stub which mates with the mast and weld or fasten it to a piece of aluminum
plate or make my own step where the mast sits inside a piece of  aluminum
"u" channel with a thru bolt in the same location. Possibly thru bolt the U
channel to the cabin top as well because I think some of the threads are
stripped in the deck mounting plate.
Anyways, I am interested to hear about what you come up with, as well as
the mast head. I am planning on taking the mast down this spring to redo
the standing rigging.

Kristian Larson
Mara #127
Squamish BC

On Sat, Mar 2, 2013 at 5:33 PM, randall weatherspoon <rlwspoon at earthlink.net
> wrote:

> The problem is in the base plate under the Mast Base - there was just
> enough
> material left in the middle to lift the Mast Base so it would not lay flat
> and when tightening the four corner bolts -- the ears break off. I am
> having
> mine machined flat for new base - which I am making a little thicker.
>
> I am having a new set of both Mast head and base CNC machined and would be
> glad to share the design and progress with anyone offline. The biggest
> problem has been getting the correct profile to match the old mast section
> -- made several plastic blanks. Also, if anyone would care to check calcs I
> can supply the drawings -- I am beefing up the ears thickness as I found a
> crack in the old one last time I had the mast down. I am also looking at
> the
> geometry so that it can be a little lighter. I found that the offset was so
> that the backstay could be tightened to induce a bend in the mast ( sure
> there is a name for that) for more speed -- as I am a cruiser I am putting
> instruments on top so trying to cut the mast weight at the top and one
> design I have is to attach the stays at the same level rather than the back
> attachment higher -- also trying to get masthead flat on top.
>
> In the middle of a job change and hope to get this done in the next few
> months as have been working with the shop for ~ 2-3 years. I have misplaced
> my calcs in my last move but anyone could reproduce from drawings if you
> know structures.
>
> Later,
> Randy
> Marisel #385
>
> -----Original Message-----
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> Today's Topics:
>
>    1. Re: Mast base (Amy & David Swanson)
>
>
> ----------------------------------------------------------------------
>
> Message: 1
> Date: Fri, 1 Mar 2013 19:26:50 -0500
> From: "Amy & David Swanson" <zira at bellsouth.net>
> To: "Alberg 30 Public List -- open to all"
>         <public-list at lists.alberg30.org>
> Subject: Re: [Public-List] Mast base
> Message-ID: <8BC1968E043D46798A79C6EF7C054DDB at acer55c1d4102c>
> Content-Type: text/plain; format=flowed; charset="iso-8859-1";
>         reply-type=original
>
> Ditto for ours (229
>
> David Swanson
> Strayaway Child
> Alberg 30 #229
>
> ----- Original Message -----
> From: "Jason S" <mpcylinderheads at gmail.com>
> To: "Alberg 30 Public List -- open to all" <public-list at lists.alberg30.org
> >
> Sent: Friday, March 01, 2013 12:24 PM
> Subject: Re: [Public-List] Mast base
>
>
> > Looks like mine broke from someone over tightening the bolts with very
> > thin
> > washer... ( not washers,). I've washed vee'd basically acting as a wedge
> > and broke the ears off.
>
>
>
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