[MHml] wire rope splice

[Bill Gibbs]

KKMI of Richmond, CA and Rigworks of San Diego, CA have declined to make me
a new halyard .  KKMI doesn't do wire-to-rope or metric wire (10mm is damn
close to .375)  RigWorks doesn't swage .75" diameters.  Sheesh.
My spectra experiment better work.

Bill
Afterburner

-----Original Message-----
From: multihulls-bounces at steamradio.com
[mailto:multihulls-bounces at steamradio.com] On Behalf Of Dave Culp
Sent: Tuesday, May 22, 2007 7:06 PM
To: Informed discussion of multihull issues
Subject: Re: [MHml] wire rope splice

Did you mention to Evan, Bill, that you can use up to 5 "beefy guys"
to sweat this halyard up? Those guys alone, using your (patented, I
presume) "row, row your boat" sweating style can get many hundreds
(50??) of pounds of force even before the winch comes into play. Panic these
guys, and who know what force you can generate?  ;-)

I'd stick with spectra and sleep nights, myself. Maybe consider Vectran, if
the tail remains mostly inside the mast at her berth.
Easier to splice--all the "big guys" use it.

Dave

On 5/23/07, Diane Selkirk <ceilydh at 3web.net> wrote:
> Bill Gibbs wrote:
> > Raising the main sail headcar a couple inches to unlock while sailing
downwind in 35+ knots does require quite a load on the tail.
> > What do you figure the max load a motivated (aka "terrified") beefy 
> > crew with a 52 winch can apply is?  5,000 pounds?  More?  That's over
70% of 12mm polyester double braid breaking strength.  Not as big a safety
factor as I thought at first.
> >
> >
> Double handled winch handle, beefy guy = 65 lbs normally
>
> Add terror = 75 lbs ? x 52 = 3900 lbs.
>
> Harken says - about 45 lbs maximum (assumes single handle I think) and
normal sized human.
>
> Doubt you can get to 96 lbs (5000/52) unless you are really big (like AC
grinder big).
>
> Then add in friction losses etc.
>
> I just did a load test on a hand operated davit with a winch with a 50:1
ratio.  Got to 1100 lbs with some effort.  Handle was not ideally placed for
maximum leverage.
>
> Evan Gatehouse
>
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