[Public-List] Mast Sheave Bolt
dk.campbell at xplornet.ca
Tue Mar 10 20:38:17 PDT 2020
So far, no one has mentioned that rope halyards are prone to stretch and so
if you do use rope halyards, and are not prepared to spend the bundle for
staset or other non-stretch line, you have the stretch on 35 feet if you
cleat on the mast or about 50 feet if you lead the halyard back to the
cockpit. Even a 3% stretch factor on relatively low stretch line will give
at least a foot on 35 feet, double or triple that on more ordinary line.
Just make sure you check this factor regardless of where the halyards are if
you want to maintain mainsail shape. Wire does not stretch much at all and
the rope tail is very short if the wire is measured correctly.
From: Gordon Laco via Public-List
Sent: Tuesday, March 10, 2020 2:16 PM
To: Alberg 30 Public List -- open to all
Cc: Gordon Laco ; George Dinwiddie ; Daniel Swords
Subject: Re: [Public-List] Mast Sheave Bolt
By the way Daniel... did you see that the movie I was working on when I
visited you is being released in June?
Sent from my iPhone
> On Mar 10, 2020, at 1:19 PM, Daniel Swords via Public-List
> <public-list at lists.alberg30.org> wrote:
> BUT - as Gordon pointed out there are some definite potential failure
> modes here and I would not recommend this system for hoisting a bosun’s
> chair. This system works for me and has for many years without the use of
> the mast sheave and without internal halyards but there are probably
> better and safer ways to attach blocks to the masthead.
> Sent from Yahoo Mail for iPhone
> On Tuesday, March 10, 2020, 11:27 AM, George Dinwiddie
> <gdinwiddie at alberg30.org> wrote:
> If you send the photo to me, I'll be glad to post it on the website.
> Include a description and I'll add that, too.
> - George
>> On 3/10/20 11:18 AM, Daniel Swords via Public-List wrote:
>> I just happen to have a photo! Who can I post it to? Can I mention
>> “Fa—-b—“ on this site or would that be rude?
>> Sent from Yahoo Mail for iPhone
>> On Tuesday, March 10, 2020, 10:15 AM, Gordon Laco <mainstay at csolve.net>
>> That’s exactly how our main halyard is rigged. Nothing is internal… just
>> a traditional masthead sheave that carries the halyard from the forward
>> face of the stick to the after…
>> Gordon Lacowww.gordonlaco.com
>> On Mar 10, 2020, at 11:13 AM, Jonathan Bresler <262alberg30 at gmail.com>
>> All halyards external?
>> The masthead on Constance has two pins abaft the mast: one is used for
>> the backstay, and the other for the main topping lift.At least that is my
>> recollection. The main halyard line is external but for the small part
>> passing over the sheave in the mast. Where do you hang a block for an
>> external main halyard? Photos?
>> On Tue, Mar 10, 2020 at 11:09 AM Gordon Laco via Public-List
>> <public-list at lists.alberg30.org> wrote:
>> I have all my halyards external in Surprise’s rig, as she was when she
>> was built.
>> We still win races, and I never worry about what’s going on inside the
>> mast that I cannot see.
>> Gordon Laco
>>> On Mar 10, 2020, at 10:59 AM, Daniel Swords via Public-List
>>> <public-list at lists.alberg30.org> wrote:
>>> I have abandoned my mast sheave and internal halyards and replaced them
>>> with simpler blocks and external halyards. You would have to provide me
>>> with wind tunnel data to convince me that at 6.5 or even 7 knots of
>>> speed the
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