Hello! Does the Inter 20 have a jib downhaul or is it sufficient to tie the jib tack down tightly after hooking the s-ring at the top? Thank you!

I attached a link to the manual. On page 13 it shows the typical 2 to 1 jib downhaul.

https://www.nacrasailing.…18-f-18-i-20-manuals.pdf



Edited by pknapp66 on Jul 09, 2019 - 08:12 AM.

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Pete Knapp
Schodack landing,NY
Goodall Viper,AHPC Viper,Nacra I20
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traphappy

Hello! Does the Inter 20 have a jib downhaul or is it sufficient to tie the jib tack down tightly after hooking the s-ring at the top? Thank you!

It doesn't look (from the manual) that it uses an s hook in the jib (i THOUGHT that was only on prindles but out of my expertise for sure) and it does not have an "on the fly" adjustable jib downhaul - but does have a nice setup for adjusting the downhaul tension between races

"JIBSAIL SYSTEM
Attach the jib halyard shackle wire
to the head of the jib, and start the
zipper around the fo r e s t ay. Run the
tail end of the jib halyard line in the
zipper with the fo r e s t ay, and pull the
jib up, zipping it closed as you pull
on the halyard (4). When the jib is
all the way up, shackle the tack to
the tab on the fo r e s t ay chainplate.
R e m ove halyard line and attach the
s h o rt line to the halyard, bl o ck or
a d j u s t e r. Run line through adjuster,
bl o ck or halyard (purchase not
needed on recreational boats) then
cleat it off (5). Tension rig befo r e
d ownhauling jib, fo r e s t ay should
n ever be loose within jib"

Learn something almost everyday. I don't have a 2-1. Pull hard and cleat. Might have to try installing.

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Steve
Nacra Inter 20
Okemos Michigan
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Thanks for the manual and other information. It seems that there are different setups for the Inter 20 jib. Mine has the s-hook on the jib and ring on the forestay. The manual does not depict that. Perhaps a snug tie down and the tack is generally sufficient with the s-hook setup.

Quote

Thanks for the manual and other information. It seems that there are different setups for the Inter 20

It could be a previous owners customizing / personal preference too -

Quote

Perhaps a snug tie down and the tack is generally sufficient with the s-hook setup.

there is little difference between a hooked head and one that is on a wire (or dyneema type line) halyard.

I use line to secure the tack of my jib - this is my "downhaul". set on the beach for conditions and can be adjusted on a pit stop if adjustment is needed but not an "on the fly" adjustment . (I wish)

traphappy

Thanks for the manual and other information. It seems that there are different setups for the Inter 20 jib. Mine has the s-hook on the jib and ring on the forestay. The manual does not depict that. Perhaps a snug tie down and the tack is generally sufficient with the s-hook setup.

What year is your boat? I have never seen an s hook on an Inter 20 but Murrays shows one for the inter 18.Mine is a 2000 but has a roller furler. Maybe the early ones had the s hook or was converted as MN3 guessed. With
the small self tacking jib I would not think changing the downhaul on the fly would be worth much.

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Pete Knapp
Schodack landing,NY
Goodall Viper,AHPC Viper,Nacra I20
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The S hook was later, not earlier. Matter of personal preference. I'm set up with an active jib downhaul controlled from the traps. Self tacker. Very effective sail trim.

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Philip
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Philip,

Do you have any pictures or could you describe how you set up the active downhaul?

Thanks,
Pete

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Pete Knapp
Schodack landing,NY
Goodall Viper,AHPC Viper,Nacra I20
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I've been guilty of largely ignoring the settings of the small jib. Seems like I should be paying more attention to the jib downhaul, rather than just tying it off tightly before sailing. Or at least thinking more about how tightly I tie it off... I figured the tight forestay will keep a straight luff, but it seems that a very tight downhaul could flatten the sail, though not to the same degree as for the main, and help manage power when it needs to be burned off.



Edited by traphappy on Jul 14, 2019 - 01:09 AM.

pknapp66

Philip,

Do you have any pictures or could you describe how you set up the active downhaul?

Thanks,
Pete

I'll look for some pictures and post them here, along with details.

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Philip
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Interesting, as it is the setting I mess with the least on the boat. I would take the jib traveler car limiter to the wire first over jib downhaul (Argie F18 setup), but the biggest thing most Inter 20's need is a re-worked main downhaul and mast rotation control system to match the Infusion. To that end, I kind of wonder where all the 2006 Alter Cup boats ended up as those were rigged better from the get go...

As to S-hook or full halyard, I much prefer the halyard lock as it eliminates compression on the forestay and rig pumping in big chop with lots of jib downhaul on. The key is to secure the ring to the forestay or unlocking the jib becomes a nightmare at the end of the day.

I'm with you Sam. I hated the S-hook and got rid of it. Hated the original mast rotation system. I've got a very unique set up where there is system of purchase, sheeting and bungees under the tramp. It also includes a cascade system with block and purchase and dyneema built internally to the boom adding to the additional purchase under the tramp. There is only one visible line attached to the rotation arm and no visible block above tramp. Credit to original design goes to Alex Sh***r. I modified his design and made it smoother with less friction.

Adding some pictures now for my active jib downhaul system . . .



Edited by P.M. on Jul 18, 2019 - 07:41 PM.

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Philip
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This is going to be harder to visualize than expected . . .

A couple of notes. All the rigging is synthetic. Most of the downhaul set up is inside the zippered jib luff. Jib downhaul is 6:1. The conventional forestay jib pigtail was done away with.

I can tell you that jib downhaul is very effective, especially when racing. It light winds it is a game changer for me. When it's honkin' I run it flat upwind and drop the jib traveler until the inside telltales are on the edge of breaking. Downwind full draft. You can see a big difference between a flat jib and one full of draft based on the downhaul setting.

I created an album with details. If you look at the root album description in the first link the details will be truncated. Click on the image to get the entire description details. Click on the image a second time and it will SUPERSIZE.
Album here:
https://www.thebeachcats.…ictures?g2_itemId=131810
First pic

Link https://www.thebeachcats.…ictures?g2_itemId=131811
Once you are in the album select next for the next picture and it will have the complete details.
Picture links in series . . .








If it helps I will see if I have a picture of it rigged with the spin pole.

This one's for you Pete, since you asked!

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Philip
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