[MHml] Friction in lines and blocks

[Ross Hobson]

Martin
yes - have read that, not sure aetahetics is a good reason for a desision, practicality comes higher on my list

as i indicted on another email - hollmatro have a v nice snap connection system on the VX40's - but what is the cost??

and on Charleston, it would be less practical and less aethetic than a ST winch.....
we seriously considered hydraulics, but so far cannot see why/nor advantages over winch with mainsheet man and play the main  on traveller

due to the size of our racks we would have to leave someone on the hull to tend mainsheet either on winch or on hydraulic, this is why we looked at a course/fine tackle set up as per lightspeed/seacart 30 - so you can see the decsion process for us. we sail with the mainsheet man on the hull, traveller man, helm and fore hand on racks when powered up



Ross


-----Original Message-----
From: multihulls-bounces at steamradio.com on behalf of Martin Schöön
Sent: Thu 06/12/2007 11:33
To: Informed discussion of multihull issues
Subject: Re: [MHml] Friction in lines and blocks
 
On Dec 6, 2007 9:57 AM, Ross Hobson <r.s.hobson at newcastle.ac.uk> wrote:
> we expeimented on the Formula 28 with a Seacart sytsem for ateh last half of the summer
> and we have dupmed it, we could not control the sail sufficently not did it allow us a
> comfortable 'safety margin' now we are back to a 4:1 main a 44St winch and deicated
> mainsail 'hand'.
>
> ok Charleston is not a seacart 30 - we are way more powerful and this is probably why
> their sysytem won't work with us, but i see no reason whay it is not a good alterantive in
> a similar underpowered boat
>
Here is what the Lightspeed people think about all this (stolen from their web):

"3. Hydraulic Mainsheet. Another feature that we rejected early and
have now come to
 embrace. Winches are out for two reasons: safety and aesthetics. If
you have winches,
 the only safe way to use them is to have a person on the sheet 100%
of the time, and
 never put it in a self tailer. We got around this with a cascading
course / fine system
 giving 8:1 and 32:1. It works (it is easy to adjust and to blow), but
has too much friction
 (hence can be a beast to trim) and requires that you start with the
course set just so.
 Hydraulics will allow anyone to trim the main, and will have relief
valves easily within
 reach of the trimmer and helmsman. Aesthetics also matter, and while
winches are not
 themselves an eyesore, they do require routing the sheets right
across the middle of the
 boat -- giving it that multihull macrame look. The parts for this are
on order, and
 Tony Delimma at Forte has made us a new boom to take the high compressive
 loads -- this should be on the boat by early March."

-- 
Martin Schöön              "Problems worthy of attack
                                         prove their worth by hitting back"
                                         Piet Hein
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