Thanks for the responses:
The halyards aren't showing any excess wear (that I can see). Is there any way 
to check if they are binding to electrical cables or themselves without 
unstepping the mast? Is there a way to tell if the hole in the sheave is 
elongated without taking it apart; ie would it wobble a little when I spin it? 
I have no idea when or if the sheaves have ever been changed. There are two 
spare sheaves (one on either side of the ones currently in use) to which I 
could switch. 
Thanks again for the help. 
Michael 

--- In [email protected], John Harker <jhar...@...> wrote:
>
> Could be the sheaves inner hole has elongated.  So it spins with no load 
> and locks with load.  How old are they and do you know if they have ever 
> been changed - from my experince and others on this board it is clear 
> the original have a finite lifespan.
> 
> John Harker    C27    Prana     6261    Santa Cruz
> 
> Don Brooks wrote:
> >  
> >
> > Michael,
> >   If you are having difficulty hoisting a person up the mast with a 
> > cabin top winch, that's normal.  You should be able to hoist the 
> > mainsail all the way up by hand with moderate effort.  The boom should 
> > be perpendicular to the mast, or slightly higher to keep the leach 
> > loose.  If that is not the case, then you should look for a 
> > problem.  Is your halyard showing any unusual signs of wear?  That 
> > could indicate a binding block at the base of the mast or cabin top.  
> > Your halyards could be twisted together inside of the mast or binding 
> > on the electrical wiring at the mast base. 
> > Don, #6293, Niceville, FL
> >
> > --- On *Sun, 3/21/10, Michael /<mlong9...@...>/* wrote:
> >
> >
> >     From: Michael <mlong9...@...>
> >     Subject: [IC27A] Way Too Much Tension on the Halyards Under Load -
> >     Please Advise
> >     To: [email protected]
> >     Date: Sunday, March 21, 2010, 10:22 AM
> >
> >      
> >
> >     I was having a lot of difficulty hoisting the main so I lubed the
> >     entire track, the cars on the main and checked for obstructions on
> >     the way up. I went all the way up to the top to see if there were
> >     any obstructions up there like maybe the halyard jumping off of
> >     the sheave or maybe even a broken one. Because of the difficulty
> >     in hoisting me on the main halyard, I decided to come down and go
> >     up on the jib halyard. I had the same problem. Both halyards move
> >     up and down effortlessly, without friction, but the moment there
> >     is any load, it takes tremendous energy to pull them up. All of
> >     the sheaves spin freely and are intact. I lubed everything at the
> >     masthead and cannot figure out why they aren't working properly.
> >     The halyards are rope and obviously internal and appear to be in
> >     good condition.
> >
> >     If anyone has experience with this or any ideas on what to do, I
> >     would really appreciate them.
> >
> >     Thank you,
> >     Michael
> >
> >
> >
>


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