[Public-list] Sheave Order and Question re: Sheave Box

[Cole, Andrew L]

Ok, here are the folks from whom I have checks so far:

Boor
Kingsland
Bergquist
Allen
Irving
Meinhold
Grosh
Parker
Hicks
Curry
Lehman
Lehman
Kirk
Katz
Stark
Fleury
Bounds
Dinwiddie
Sutherland
Ydel
Helms

There was a question about the sheave box/cheek plate construction in
the last email:

"I'm thinking that the problem is in the housing (pieces of flat metal
surrounding the sheave). I probably will replace my aluminum sheave
regardless, but it will give a little time to see how these other
sheaves are working out for everyone. If anyone has any insight on the
housing surrounding the sheave let me know. I think I replaced it with
stainless steel and I think it was originally aluminum. Maybe that
caused some corrosion that froze it up or possibly the whole assembly
got loose or jammed together and froze it up."

So far we have replaced three sheaves, two went in without drama, the
third went in, but required minor drilling to enlarge the old hole from
1/2 to 5/8 from what I understand.  Both Lanny's and my masts were put
together with a 1/2" bolt through a 5/8 outside diameter compression
sleeve.  The bolt passed through the shroud tangs, mast wall, cheek
plate, sheave, cheek plate, mast wall, shroud tang and then to a locking
nut.  The cheek plates in my mast were loose, when I pulled the bolt,
they came out.  Both were fairly light gauge aluminum, square, about the
size of the sheave, and flared/bent at the ends where they protruded
from the mast fore and aft.  As I understand it, J's mast had no
compression sleeve, but had similar cheek plates, however they were
welded in place.  I don't know whether Lanny's cheek plates were welded
or loose.  

If your halyard has jumped the sheave, either the sheave was terribly
worn, the cheek plates flexed enough to permit the wire to get over the
side and jamb, or there was enough extra space between the sheave and
the cheek plate to permit the halyard to jump over the side and jamb.
If I had gone back with wire, I would have done what someone on the list
suggested, which is to tap a machine screw through the mast wall to
screw against the cheek plate to apply pressure, possibly on both sides.
This seemed to be a fairly precision operation, and I probably would
have had trouble doing it while hanging over the water at the bow of my
boat.  

The new sheaves will work with either wire or rope, however going with
rope for me obviated the need for any corrective measures, and also
obviated the need for the aluminum plates that had previously been
screwed the fore and aft faces of the mast to keep the wire down on the
sheave.  I have been out twice with the rope halyard on the new sheave,
it works like a dream so far.  I have not raced the boat in heavy air
yet, we will see if stretch is an issue (I don't think it will be with
the Sta-Set X, which was fairly inexpensive), however if it is, it will
simply mean an upgraded halyard.

Our sheave was fairly torn up when I removed it, and even had I closed
down the box and put the wire halyard back on the sheave, it would only
have been a matter of time before it was out of commission again.  I
have the old one in the galley sink and will try to get photos for
someone to post alongside a photo of the new sheave.

There is no pressure to get in on this order, the manufacturer is going
to build a handful of extras to keep in stock for anyone else who comes
along.  He has agreed to sell them to us for the same price as the group
purchase, $64 plus $12 shipping (which is still very reasonable and
below what a local shop quoted me without shipping).  His web address,
if you want to order one directly, is www.zephyrwerks.com and his name
is Ed Louchard.

If you have not already sent your check, please do it in time for me to
receive it by Monday, that is when I will send the final payment to the
manufacturer and have him ship the sheaves.  Again, you can place the
order directly through Zephyr, it will just cost you a little more in
shipping.

Andrew  

Cole, Andrew L
Admitted in Maryland, Virginia & Florida
One Corporate Center
10451 Mill Run Circle, Suite 1000
Baltimore MD 21117

 
tel: 410 581-7408
fax: (410) 581-7410
mob: (410) 206-3577

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