[Public-List] Design of derrick to raise Alberg 30 mast

[Jeffrey]

To raise the mast, is there any difficulty in getting the mast that
last few degrees vertical; and does the a-frame need to be moved fore
or aft using the stays to do so? Would you set up the a-frame legs a
few degrees off from vertical? Or vertical but a few inches back from
where the bast base is??

-Jeff

On Nov 30, 2007 9:06 PM, Bill Burke <BurkeNH at verizon.net> wrote:
> I also got tired of my local yard's extortion and built a "Chesapeake" style
> set of shears for raising and lowering the mast and can add a few comments
> to Don's excellent description...
>
> I built mine of 1.5" heavy duty electrical conduit but sleeved the section
> joints with a full section of 1.25" conduit.  It's just a tiny bit loose (2
> wraps of duct tape at several locations take up the play snugly).  The
> sleeved sections are assembled with thru-bolts.  This works well to keep the
> legs in column.
>
> I would be EXTREMELY wary of tying anything off to the dock that's also
> attached to the legs.  This makes you vulnerable to something as random as a
> wake from a passing inconsiderate motorboat - a tossing boat with a
> dock-fixed rig on it has the potential for serious damage including bringing
> the whole thing down or damaging the deck.
>
> I built base blocks out of two laminated 2x10s with a pocket hollowed out
> for the base of the legs.  These are secured to the chainplates, and I also
> have an eyebolt in the base of each leg for securing it as well.
>
> I also work with my wife, who I admit also spent a number of years on
> schooners and in square rig so she's certainly competent, but I'd estimate
> the job to be about half the 6 hours mentioned when you get the hang of the
> process.  We have two horses that we set up on the foredeck and cockpit to
> set the mast on while we're preparing to step it, and onto which we lower
> it.  It is a good 200 lbs, so any additional bystanders at the yard you can
> recruit to help shoulder the mast makes moving the mast alot easier.
>
> As Don said, take it slow and safe.  It isn't rocket science though.
> Bill
>
>
>
>
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-- 
Jeffrey Fongemie          Internet Guns For Hire
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