[Public-List] PULLEY AT TOP OF MAST

[Mike Meinhold via Public-List]

Jim,
 On forward and aft sides where the halyard enters the mast, there is an
aluminum plate partially covering the top of the hole, This is to prevent
the wire rope from "jumping" over the sheave (giant pulley).  These plates
get worn, shifted or lost over time and the halyard starts jumping. Many
owners have replaced the wire halyard with all rope (including me).
However, the sheave for the wire is much smaller than that for rope, and
will likely need to be replaced.  We had a group purchase some time ago of
a composite sheave to replace the original.

  In any case, you need to get to the masthead to
   --examine the guard plates and replace or fix them
  -- evaluate your current sheave and see if can handle rope (probably not)

Getting up there without the main halyard can be dangerous, as you are
relying on blocks . You really should have you mast taken down to evaluate
and fix this problem.  This goes to the question of raising the main with
blocks - I assume you are talking about the topping lift for the boom.
That should be a strong and strongly attached block in order to support the
boom and would be adequate to raise the main - I have actually done that
myself when the main halyard was stuck like yours.  It should not be a
permanent fix.

Mike
Rinn Duin #272




Mike
Michael J. Meinhold 301 852 0619 meinhold272 at gmail.com

On Sun, Oct 18, 2015 at 8:21 AM, JAMES DAY via Public-List <
public-list at lists.alberg30.org> wrote:

> My cable that lifts the main sail has jumped off the pulley inside the
> mast two times now, once in VERY BAD weather and once on a sunny afternoon.
>
> The sail is currently stuck 3/4 way up and I would like to know if there
> is a repair for this, short of removing the mast and rebuilding the pulley
> area to stop this problem??
>
> Has any one replaced the pulley with a block on the aft side of the mast,
> and if so what size block? My thoughts was to install a double block (over
> and under) where the boom block is installed. I am not an engineer, so have
> question. Is the bolt that holds the block for the boom would be strong
> enough to also hold the weight of pulling the main sail up??
>
> Thank you for any advice or experience with this problem, I have enjoyed
> My Alberg for the last eight years and have sailed her for many thousand
> miles according to my chart plotter. She has really brought me many many
> days of pleasure mixed with a few times of shear terror.
>
> Jim Day at Clearwater Beach, Florida
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