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Nacra rudder overhaul #277697
02/23/15 02:50 AM
02/23/15 02:50 AM
Joined: Sep 2014
Posts: 32
California
S
sierracat Offline OP
newbie
sierracat  Offline OP
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Joined: Sep 2014
Posts: 32
California
Just started working on the rudders for the Nacra 5.5 uni overhaul. Overall they seem in pretty good shape. I'd just like to strengthen any worn areas (rivets) and make them reliable, while taking out some slop where I can. I'll be adding all new down-lines and up-bungee. I'm aware that many get rid of the bungee and install pull-up lines, but I don't want to go there just yet, and will try to get the original system working well. I'll outline my basic questions directly below, then there is a link to pics and more detail over on the Beachcats forum. I've searched the internet for everything related to Nacra rudders, and have read countless pages here and elsewhere. I've found many good tips and tricks. Nonetheless, I still have some unanswered questions.

1. Pivot hole in blades worn and sloppy. Fill and re-drill? Use existing holes and pad insert with epoxy?
2. Castings are not the type with a delrin screw for blade rake adjustment. How major is this going to be in tuning the helm pressure?
3. bolt through end of tiller tube from cross-tie attachment is badly worn/oversized. Can I cut off an inch of tiller tube and drill new holes?
4. Add a sheave on the pin in the casting that the pull-down line runs over?
5. Proper hardware for each end of pintle?

Pics and more descriptions of what I'm working with over here at Beachcats

Thanks as always

-- Have You Seen This? --
Re: Nacra rudder overhaul [Re: sierracat] #277717
02/25/15 12:30 PM
02/25/15 12:30 PM
Joined: Jul 2001
Posts: 2,844
42.904444 N; 88.008586 W
Todd_Sails Offline
Carpal Tunnel
Todd_Sails  Offline
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Joined: Jul 2001
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42.904444 N; 88.008586 W
One thing I'd like to add FWIW

On my 6.0, I did away with the bungee uphaul- it always puts tension against the downhaul, etc.
Instead, I put a line and a seperate cleat on the side of the tiller arm. That way, they would drag in the water and still give you some control, and pulling on the line and cleating it kept it up when it needed to be up.

I also would get the lock down thingy (forget it's name), about 1-2 inches from lock down, cleat the line in, then lock it the rest of the way down.
This technique always kept it from 'backing off a bit' when it was locked down.

* That's my old 6.0 in my avatar, with my wife and I

HTH
FWIW


F-18 Infusion
#626- SOLD it!

'Long Live the Legend of Chris Kyle'
Re: Nacra rudder overhaul [Re: Todd_Sails] #277757
03/02/15 07:52 AM
03/02/15 07:52 AM
Joined: Apr 2012
Posts: 190
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Bille Offline
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Bille  Offline
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Originally Posted by Todd_Sails

...


I also would get the lock down thingy (forget it's name), about 1-2 inches from lock down, cleat the line in, then lock it the rest of the way down.
This technique always kept it from 'backing off a bit' when it was locked down.



* That's my old 6.0 in my avatar, with my wife and I

HTH
FWIW


Cool looking CAT !!!

On your lock-down cleat ; if your rudder hits a log, will
the line release ? I got spring loaded centerboards
on my H-21se ; so they go up if i hit something. Next thing
down the line is my rudder ; and i Like your idea !!!

Bille

Re: Nacra rudder overhaul [Re: Bille] #277759
03/02/15 09:34 AM
03/02/15 09:34 AM
Joined: Jun 2002
Posts: 1,658
Florida Suncoast, Dunedin Caus...
catman Offline
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Florida Suncoast, Dunedin Caus...
Use a line that stretches. Trying to preload the line is unnecessary. I have this system and I use 1/4" 3 strand nylon.


Have Fun
Re: Nacra rudder overhaul [Re: catman] #277767
03/03/15 07:56 AM
03/03/15 07:56 AM
Joined: Apr 2012
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Bille Offline
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Bille  Offline
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Originally Posted by catman
Use a line that stretches.
...
I have this system and I use 1/4" 3 strand nylon.


Last night i woke up at 4:am ; was trying to think of a way
to place the jam cleat for your line, on a release of some-sort
that would let-go at a predetermined pressure ?

Bille

Re: Nacra rudder overhaul [Re: Bille] #277769
03/03/15 09:53 AM
03/03/15 09:53 AM
Joined: Dec 2001
Posts: 5,590
Naples, FL
waterbug_wpb Offline
Carpal Tunnel
waterbug_wpb  Offline
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Posts: 5,590
Naples, FL
I think they have jam cleats that one side lifts up at a certain pressure.

My rudder has cam cleats that over-rotate when the rudder hits something, allowing the down-line to slip through


Jay

Re: Nacra rudder overhaul [Re: Bille] #277770
03/03/15 10:31 AM
03/03/15 10:31 AM
Joined: Jun 2001
Posts: 12,310
South Carolina
Jake Offline
Carpal Tunnel
Jake  Offline
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Joined: Jun 2001
Posts: 12,310
South Carolina
Originally Posted by Bille
Originally Posted by catman
Use a line that stretches.
...
I have this system and I use 1/4" 3 strand nylon.


Last night i woke up at 4:am ; was trying to think of a way
to place the jam cleat for your line, on a release of some-sort
that would let-go at a predetermined pressure ?

Bille


V-jam cleat with release cam. They have a little off-center disk on the bottom of the cleat that you can rotate which will fine-tune the release pressure. Falcon Marine used to use these on the F16 rudder systems (I'm not sure if they still do or not).

http://www.go2marine.com/product/209777F/sea-dog-jam-cleats-clamcleat-auto-release-racing-mini.html


Jake Kohl
Re: Nacra rudder overhaul [Re: sierracat] #277777
03/03/15 10:13 PM
03/03/15 10:13 PM
Joined: Apr 2012
Posts: 190
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Bille Offline
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Bille  Offline
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Joined: Apr 2012
Posts: 190
Forums are GREAT for information ; i "Like" that
V-jam cleat with the release cam !
Awesome solution !!!!!!!!!!!...

Bille

Re: Nacra rudder overhaul [Re: Bille] #277778
03/04/15 07:14 AM
03/04/15 07:14 AM
Joined: Jun 2001
Posts: 12,310
South Carolina
Jake Offline
Carpal Tunnel
Jake  Offline
Carpal Tunnel

Joined: Jun 2001
Posts: 12,310
South Carolina
Originally Posted by Bille
Forums are GREAT for information ; i "Like" that
V-jam cleat with the release cam !
Awesome solution !!!!!!!!!!!...

Bille


indeed! The first time I saw them was on the Falcon F16 and I thought they were ingenious then and now too.


Jake Kohl
Re: Nacra rudder overhaul [Re: Jake] #277779
03/04/15 07:15 AM
03/04/15 07:15 AM
Joined: Apr 2005
Posts: 473
Panama City, Florida
Redtwin Offline
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Redtwin  Offline
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Posts: 473
Panama City, Florida
Is this the same thing that Nacra used to call the "pivmatic"?


Rob V. Nacra 5.2 Panama City
Re: Nacra rudder overhaul [Re: Redtwin] #277780
03/04/15 08:24 AM
03/04/15 08:24 AM
Joined: Jun 2001
Posts: 12,310
South Carolina
Jake Offline
Carpal Tunnel
Jake  Offline
Carpal Tunnel

Joined: Jun 2001
Posts: 12,310
South Carolina
Originally Posted by Redtwin
Is this the same thing that Nacra used to call the "pivmatic"?


similar concept but different. The pivamatic is this thing:
http://www.thebeachcats.com/gallery...p;g2_itemId=112994&g2_serialNumber=3


Jake Kohl
Re: Nacra rudder overhaul [Re: Redtwin] #277781
03/04/15 08:29 AM
03/04/15 08:29 AM
Joined: Jun 2002
Posts: 1,658
Florida Suncoast, Dunedin Caus...
catman Offline
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catman  Offline
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Joined: Jun 2002
Posts: 1,658
Florida Suncoast, Dunedin Caus...
No. The pivmatics are a trimmed up fiberglass tube with a clam cleat riveted to it. Those other pivioting clam cleats are not very robust. They are ok if you rarely hit the bottom. A friend tried them and they failed after a couple weeks.

Fairly sure the outer tube of a worn out Hot Stick is the same diameter as the piv's. lacking that you could lay some glass up on the tiller tube. Trim it up and install a clam cleat.


Have Fun

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