Raking string

02/05/2010 23:06:32
John 2434
Can anyone explain why these ropes run around to the other side?

http://www.merlinrocket.co.uk/gallery/view_photo.asp?folder=gallery/rigging_guide/3683&file=centreboard_case_rear.jpg

I assume they're the rig back / fwd control lines. If they're cleated on the other side, no rope would run through those blocks.?

03/05/2010 22:14:14
Mags
Yes, those are the 'one string' lines. You have to uncleat "rig forward" in order to pull on "rig back" and vica versa.

Yes, we know that means two strings overall!

03/05/2010 23:15:39
John 2434
Hi mags,

What I dont undersand, is that the ones running behind the c/b case won't move if they are cleated on the other side. Its less string and blocks to get a 2:1 from a single block with a beckit than to have two blocks (albeit one shared). Cant see what it adds just having a single piece of string to do both sides. ?

04/05/2010 16:41:35
ChrisJ
Its normally the tails that go across to the other side, to allow a continuous line.
The trick is to avoid pulling all the "rig back" in on one side, while pulling all the "rig forward" on the other (which might be typical on a triangluar course). You would soon run out of adjustment and not be able to control the rig on the side you are sitting.

As it is the tails go across to the other side of the boat, so you can continually adjust forward or backward without running out of string.

04/05/2010 18:44:38
John 2434
Thanks Chris. I can see the utility now. Now to work out how to string it. More fittings!

04/05/2010 19:09:58
John 2434
I've been scribbling on the back of an envelope. 

Assuming you go rig back on one tack, and forward on the other...

Am I right thinkin that the slack on the fwd / back controls is cross-connected behind the centerboard case and that periodically you have to grab hold of the blocks that run along the centerboard case and drag them round a bit so that they dont run out of travel.

i.e raking back on port, fwd on stbd a couple of times:
2:1 block on the rake fwd line on the port side hits the king post,
2:1 block on rake back on the port side reaches end of c/b case.

04/05/2010 20:19:08
Andy Hay - Champs Chappie
Hi John - I did the full one string conversion on 3386. The two tails on each side are spliced together, with slack under the side deck. So in reality the up / down on both sides is the one length of string. You are correct that the blocks at the back of the case are the cross connections between the port & stbd sides, but these are not the slack in the system.

So to rake, uncleat the up cleat, pull on the back / down rope. To derake, reverse the process. Since the system is one length of string it is self adjusting.

Once you have stretched all the ropes and adjusted the splices, the system shouldn't bottom out.

18/05/2010 19:00:16
Richard
The strings tend to end up one-sided NOT because you have different rake on each tack(!) but because you tend to go rig back UPWIND and rig forward DOWNWIND.  On a port-hand course this means you are going rig forward after bearing away on STARBOARD at the weather mark, then rig back on PORT after rounding the leeward mark.   

Top tip: before each start (on a port-hand course), pull all the rig-forward string through to the port side and pull the rig-back string through to starboard.

The same applies to the kicking strap control line, which (on a port-hand course) always goes off on starboard tack at the weather mark and back on on port tack at the leeward mark.

18/05/2010 20:52:52
John2434
Hi Richard, thanks for the clarification, and tips.

I didnt literally mean on each tack! Just that reverse operations would be occuring on different sides of the boat, at successive upwind/downwind marks.

Its all sorted now, as per Andy's instructions; my raking control lines for forward and back on both sides are one single and continuous piece of string, with elastic takeaways under the side decks.

In due course my kicker and other lines should be continuous too.

See progress at:

http://www.facebook.com/album.php?aid=83656&id=564343407&l=5526308762

19/05/2010 08:34:39
Garry R
For convenience

http://www.facebook.com/album.php?aid=83656&id=564343407&l=5526308762

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