Retrofitting newer style Inter rudders to 5.5. :: TheBeachcats.com :: Catamaran Sailing Information, Tips, Pictures, and Forums

Retrofitting newer style Inter rudders to 5.5.

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yurdle

Rank: Mate

Registered: Aug 22, 2007

Last visit: May 22, 2012

Posts: 514
Posted: Feb 22, 2012 - 04:05 PM

Fair enough..

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Rob
OKC, OK
I17R
~~N5.5~~
~~N5.2~~
~~P18~~
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walls619

Rank: Lubber

Registered: Jun 23, 2011

Last visit: Feb 23, 2012

Posts: 48
Posted: Feb 22, 2012 - 08:06 PM

launched my 5.5sl for the first time maiden ,its been months of work and research to bring this one back my other
(first )boat 5.2 compared to 5.5 ...two up first time out,i know rookie but remember the first time ,the 5.2 had single wire .so well balanced the 5.5 was .Anyways replaced everything as i found it,inc rudders ,schock cord runs through arm pulls up.Line runs around middle tramp cam cleats on rear beam line pulls rudders down sound familiar?Is this inter style? custom?1989 nacra? side note-Photos have made all the differance!!!lets all start posting more photos !!
yurdle

Rank: Mate

Registered: Aug 22, 2007

Last visit: May 22, 2012

Posts: 514
Posted: Feb 23, 2012 - 11:06 AM

Here's a pic of an inter rudder, casting and arm.

I assume it's a 1st gen but I honestly don't know as I've never seen pics of all 3.

I still don't follow you on your setup. I can't think of any cam cleats on the rear of a 5.5 other than the traveler and lower main block....I also can't think of any cleats on the rear beam. The 5.2 can have a couple cleats on the rear beam for adjusting the jib blocks along the wires.

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Rob
OKC, OK
I17R
~~N5.5~~
~~N5.2~~
~~P18~~
--
walls619

Rank: Lubber

Registered: Jun 23, 2011

Last visit: Feb 23, 2012

Posts: 48
Posted: Feb 23, 2012 - 01:31 PM

I'll enlist the help of wife to post photo
DamonLinkous

Rank: Administrator

Registered: Jul 19, 2001

Last visit: May 19, 2012

Posts: 1502
Posted: Feb 23, 2012 - 02:09 PM

walls619I'll enlist the help of wife to post photo

If you haven't found them, instructions for posting photos are in the FAQ, links in my signature below.

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Damon Linkous
1992 Hobie 18 Magnum
Memphis, TN

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RicardOben

Rank: Lubber

Registered: Jan 24, 2012

Last visit: May 16, 2012

Posts: 51
Posted: Apr 01, 2012 - 11:34 AM

Ok I finally got around to doing the swap. I got about 1/2 the parts from Dan Berger (cat reaper) on this forum. I got one arm and one lower casting from someone else on the forum. I got the rest of the parts including some new stuff from Rick Bliss of New England Catamarans.

THIS IS IMPORTANT. I can not say enough good about Rick. I knew who he was from the old Worell 1000 coverage in Cat Sailor magazine as well as many other races he has participated in and won over the years. He was always reponsive on email, and by phone. I knew very little about what I was doing and he was SUPER Helpful. When I need parts I am calling Rick every time PERIOD. THe knowledge he has is amazing.

On with the story:

I started with the stock 5.5 rudder on one side.

I then put one bolt in the old hole with the new style on the other hull. They came from a Nacra inter 570. I was after the casting style more than the blade.

The next problem was the arms. On the 5.5 they never move and wer up high enough. The inter arms were striaght on the 570 and needed to be bent. I borrow a Harbor Freight tubing bender and did the bending, it was easy, getting them the same was not as easy.

They fit and are on but they are very tight, the rudder is almost touching the hull and the casting is almost touching the top of the hull.

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Lake Perry KS
H-18
N-5.5 UNI +spin
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RicardOben

Rank: Lubber

Registered: Jan 24, 2012

Last visit: May 16, 2012

Posts: 51
Posted: Apr 01, 2012 - 11:43 AM

To follow up more, I used the 5.5 cross bar, just got rid of the adjuster and put the new ends in the tubing. No mods to the tubing but drilling one hole. The adjuster hole lined up with the roll pin so I had to move it inboard about 1/2 inch.

I have not sailed the boat yet but they work nice and have to be better than the rope thing. I have several hundred bucks in the swap so I hope it works good. I will have some old parts for sale soon. If there are any questions let me know. Richard.

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Lake Perry KS
H-18
N-5.5 UNI +spin
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yurdle

Rank: Mate

Registered: Aug 22, 2007

Last visit: May 22, 2012

Posts: 514
Posted: Apr 02, 2012 - 09:56 AM

I like it. What did you use for the rubber connections between the arms and xbar?

--
Rob
OKC, OK
I17R
~~N5.5~~
~~N5.2~~
~~P18~~
--
yurdle

Rank: Mate

Registered: Aug 22, 2007

Last visit: May 22, 2012

Posts: 514
Posted: Apr 02, 2012 - 09:59 AM

got pics of a 5.5 rudder next to a 570 rudder? Is the 570 a skeg boat?

--
Rob
OKC, OK
I17R
~~N5.5~~
~~N5.2~~
~~P18~~
--
RicardOben

Rank: Lubber

Registered: Jan 24, 2012

Last visit: May 16, 2012

Posts: 51
Posted: Apr 02, 2012 - 11:07 AM

I used the Inter style rubber connections, the set up I bought came with one used one and I got two new ones so I can have a spare. The first two pics are of the 5.5 and the 570 on opposite sides of the boat. The 570 is about an inch longer and has about 1/2 inch more chord. They are so close it is amazing. I will have to sail it to see if I have the rake right or not.

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Lake Perry KS
H-18
N-5.5 UNI +spin
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nhanson

Rank: Lubber

Registered: Jul 06, 2008

Last visit: May 16, 2012

Posts: 51
Posted: Apr 02, 2012 - 04:34 PM

Those are first gen inter rudders. I don't want to be a debbie downer, but the 5.5 (no dagger boards) might be a bit touchy with those. there are a bunch of 5.7 blades on the classifieds here right now. But don't let me stop you. If it works ... do it.

my bad .. they are on Ebay ... http://www.ebay.com/itm/N…fd&vxp=mtr#ht_500wt_1289

Edited by nhanson on Apr 02, 2012 - 05:38 PM.

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nacra inter-18
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yurdle

Rank: Mate

Registered: Aug 22, 2007

Last visit: May 22, 2012

Posts: 514
Posted: Apr 03, 2012 - 11:16 AM

those look to me like they'll work great for his 5.5. It looks like they're a touch longer (makes sense w/ skegs from the 570) but I doubt that's an issue. Maybe you're looking at my pic of the Inter rudder? I'm not planning on using it for anything other than my Inter. =)

Here's a pic of the 5.2/5.5's next to the inter (not to scale, just for quick comparison):

Also, the 5.5 most def. has daggers, not sure what you meant there.

--
Rob
OKC, OK
I17R
~~N5.5~~
~~N5.2~~
~~P18~~
--
RicardOben

Rank: Lubber

Registered: Jan 24, 2012

Last visit: May 16, 2012

Posts: 51
Posted: Apr 03, 2012 - 11:32 AM

N hanson, I have a 5.5 Uni and it has pretty big dagger boards, see my Avatar the up board is as tall as I am. The rudders from the 570 are longer and will help with the fact I have a hooter or soft spin set up on the boat. My only question at this point is rake, do I have it close enough or not. The first pix make me think it will be very close, I will know when I sail it. My plan is to sail it with one rudder down at a time and feel the helm, make adjustments and then do the other side. I can do that without the spin right off of the beach.

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Lake Perry KS
H-18
N-5.5 UNI +spin
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yurdle

Rank: Mate

Registered: Aug 22, 2007

Last visit: May 22, 2012

Posts: 514
Posted: Apr 03, 2012 - 11:40 AM

I don't think that the rudders and rake will affect each other at all in this case. The rudders may feel a little heavy but I don't think your rake will negate that (without drastically moving it forward, which isn't an option)

The 5.5 is balanced enough that I doubt the slightly larger rudders present any issue at all. You'll know soon enough. (hopefully the rest of us will too)

--
Rob
OKC, OK
I17R
~~N5.5~~
~~N5.2~~
~~P18~~
--
RicardOben

Rank: Lubber

Registered: Jan 24, 2012

Last visit: May 16, 2012

Posts: 51
Posted: Apr 03, 2012 - 03:12 PM

I agree with you Yurdle, I think they could even be better, a longer blade will give more stability. Also the rake adjustment is very easy on the Inter style castings. I will not know for sure for several weeks. Richard.

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Lake Perry KS
H-18
N-5.5 UNI +spin
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