Jump to content

Downhaul (Cunningham) power?


MartinRF

Recommended Posts

Hello,

 

How powerful are your mainsail downhaul/Cunninghams?

I use 8x and think that is too little.

 

How do you tune it? Same as beach cats?

 

/Martin

Link to post
Share on other sites
What a great site GW. :clap: :clap:

 

I lost myself for a couple of hours. :oops: :oops:

Too bad, please accept my apologies.

:D

 

No one on the downhaul thing?

 

/Martin

Link to post
Share on other sites

we are using a 4:1 on a 2:1 but it only just cuts the mustard.

 

have considered leading it to a winch instead but not really set up to do this.

 

love your boat by the way, and your website. Top work. :)

Link to post
Share on other sites

F18 use up to a 16 to 1, and the purpose is to flatten the top of the sail.

They are using square tops, so would guess the shape of the sail, height of the mast would impact on effectiveness.

Link to post
Share on other sites

my bad we are actually 6:1 on a 2:1 so 12:1 total. but not really enough grunt in it.

 

.....and we are substantially bigger than a paper tiger :)

Link to post
Share on other sites

Not many boats have enough grunt to actually work.

On a stiff rig the cunno is the main sail control along with mast spanner so it has to work.

 

Timberwolfs set up really works well and is 28 : 1 purchase.

Link to post
Share on other sites
Timberwolfs set up really works well and is 28 : 1 purchase.

How is that built and where is it located?

 

/Martin

 

I would be interested in the same information if possible please?

Craig

Link to post
Share on other sites

Tack ring has a hook.

 

From the tack down through a hollow vertical gooseneck pin,

at the base of the mast is a Harken wire cheek block (HA 309), round that,

 

Back up the mast about 1800mm to a second harken cheek block (HA 309).

 

on the end of that rope is a block (HA 308) setting up the first cascade 2:1

 

From the base of the mast up through that block with a second much lighter block (HA 304)on the end

setting up the second 2:1

 

Off that is a Harken triple block and becket at the bottom (HA 231), it has a little cam cleat built onto it,

aty the top is a harken triple (HA 228), giving 7:1

 

Total purchase 28:1

 

getting the first two cascades set to the right length is essential to get enough travel

Link to post
Share on other sites
Yes, exactly !

 

In a strong breeze with Carbon mainsail the harder you pull the cunno, the faster you go

 

Coupled with less mast rotation

Follow up question: What is keeping the sail up? Hook? Single/double halyard? What clutch?

 

Single, 8mm non-cover spectra halyard and Spinlock XT (XTS by today's nomenclature) here.

The halyard is sleeved for maximum clutch holding power. So far this has worked as intended.

 

/Martin (summer vacation starts today)

Link to post
Share on other sites
[Follow up question: What is keeping the sail up? Hook? Single/double halyard? What clutch?

 

 

Main Halyard is 8mm Superbraid (spectra) uncovered (cover starts just above where it goes into clutch),

 

2:1 head shackle is Tylaska H5

 

Clutch is Lewmar 2910 1208 (6-8mm)

 

I checked the boat and the cunno purchase is actually only 14:1, it has only got 1 of the cascades on it. But it is certainly plenty of purchase.

Link to post
Share on other sites

Main Halyard is 8mm Superbraid (spectra) uncovered (cover starts just above where it goes into clutch),

 

2:1 head shackle is Tylaska H5

 

Clutch is Lewmar 2910 1208 (6-8mm)

 

I checked the boat and the cunno purchase is actually only 14:1, it has only got 1 of the cascades on it. But it is certainly plenty of purchase.

I take that is 8 mm including the cover.

 

I have up-dated my sketch:

Timberwolf_downhaul.png

/Martin

Link to post
Share on other sites

 

2:1 head shackle is Tylaska H5

 

 

or for those running a more budget style campaign they could use a "mylaska" available at all good marine stores :)

 

(also known as a shackle and a sheave)

post-2522-141887162901.jpg

post-2522-141887162911.jpg

Link to post
Share on other sites

Archived

This topic is now archived and is closed to further replies.


×
×
  • Create New...