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Old Mar 12, 2015, 02:09 PM
tarmstro is offline
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RC Newbie with lots of ideas
Chile, Santiago Metropolitan Region, Stgo
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Quote:
Originally Posted by SoloProFan View Post
That boat was like fighting for it's life.
That is what we call a breeze here... common conditions in the summer afternoon... Keeps you concentrated. You should have seen me last year with A-rig in these conditions!

Quote:
Originally Posted by SoloProFan View Post
Btw, what was that shadow you see moving over the water surface a few seconds before the end of the vid?
Didn't notice! Must have been an aircraft. This venue is near the airport, just below the approaching path.
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Old Mar 12, 2015, 03:00 PM
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RC Newbie with lots of ideas
Chile, Santiago Metropolitan Region, Stgo
Joined Dec 2012
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We mostly race at these venues:

Carén, where the last video was filmed: http://www.cvrc.cl/2014/01/10/laguna-caren/
Vitacura, where the last race took place: http://www.cvrc.cl/2014/01/02/laguna...o-de-vitacura/
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Old Mar 19, 2015, 07:36 AM
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Swing rig setup

From your photos I can tell that the breakback system you used was bound to fail. I've been sailing with breakback swing rigs since the 1980's so I can give you a few tips.

First, you must think of the jib as a door with a hinge at the end of the boom near the mast and a hinge where the jib stay attaches to the mast. In your photo the lower hinge is not aligned correctly and if it were on a door that door would not swing open.

Setting the sails correctly on a breakback swing rig is the same as setting the sails on a conventional rig provided that the conventional rig has the jib stay aligned with the centerline of the boat. This is the difference between a breaback swing rig and the conventional rig most guys use today with the jib cantilevered over the centerline.

Looking from the crows nest the breakback swing rig should be set up with the leading edge of the jib over the centerline. This will require the spar that the jib pivot is mounted on to be to the lee of the centerline. How far to the lee will take some experimentation because different sails require adjustments, but the general idea is to have the jib's leading edge aligned with the centerline of your boat and the sails to be set just as on a conventional boat.

I see from your photos that you have a mast trunk. If you have the ability to adjust your mast rake you will want to have your mast vertical in most conditions. In light airs, and puffy ones, you will want to have your mast raked about 3 degrees forward. This will use the weight of the mast to bring your rig out to reaching position. Having your rig raked aft, as in the photos, means that the rig will center and the wind has to lift the weight of the mast as well as the boom and the sails to get moving. With the rig raked forward it naturally goes out, and as the wind picks up it is only a matter is adjusting the relation to the new wind by hauling in the sheets or letting out line. This will let the boat react to zephyrs that other boats don't feel yet.

The common logic now is that swing rigs are only good in A size rigs. I still sail breakback swing rigs in B size but beyond 15 mph I go down to a conventional rig. I will also go down if is gusty. Once the wind goes above 10 to 12 I will rake my rig forward again. This allows wind to spill off the top of the mainsail and improves the control downwind because wind flows over the sail rather than catching the sail and forcing the boat to dive. That is not to say that the boat doesn't dive, just not as much as the boats around it.

Hope this helps.
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Old Mar 19, 2015, 07:52 AM
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Swing rig setup

One other thing, your rig is too high off the deck. You have the right idea by angling the booms up but unless your boat is extremely tender the spars should be close to the deck. This allows you greater control of the rig because there is less line to stretch between the deck fairlead and the boom.
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Old Mar 26, 2015, 02:44 AM
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converting from swing rig to conventional rig

Hi guys


I'm having a goth rg65 but i'm having a swing A rig sail.
I wonder if i could use the sail with the conventional rig instead cause i could not find any idea to make it swing easily ... i'm having the plastic bearing from Sailsetc but it is just not able to swing smoothly.

The sail area of the swing sail is slightly smaller than the conventional sail, so i guess it's not against the rules right, if i'm converting it to conventional and race ?
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Old Mar 26, 2015, 05:00 AM
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If you are using a combo of swing rigs and conventional then you should have two mast positions - for the swing rig one use flanged stainless bearings that suit the diameter of your mast.

Here's a link to one that's 6mm internal and 8mm external - fit one of those in the top of an aluminium pipe and a non flanged in the bottom and you should see firction free swinging...

http://simplybearings.co.uk/shop/p15...duct_info.html
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Old Mar 26, 2015, 06:46 AM
tarmstro is offline
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RC Newbie with lots of ideas
Chile, Santiago Metropolitan Region, Stgo
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Quote:
Originally Posted by zornzack View Post
Hi guys


I'm having a goth rg65 but i'm having a swing A rig sail.
I wonder if i could use the sail with the conventional rig instead cause i could not find any idea to make it swing easily ... i'm having the plastic bearing from Sailsetc but it is just not able to swing smoothly.

The sail area of the swing sail is slightly smaller than the conventional sail, so i guess it's not against the rules right, if i'm converting it to conventional and race ?
Converting sails is not a good idea. The sail area distribution is different! Sloop Rigs have a ~40% jib and ~60 main, compared to ~30% jib and ~70% main on a Swing Rig. You should build/get different sails for a different rig. (See here for a comparison: https://docs.google.com/spreadsheets...it?usp=sharing )

And as "Si2" noted, you will need a different mast position for Sloop and Swing rigs.

Both things (different mast position and different sail area distribution) are needed to mantain balance between sail center of effort (CE) and hull center of lateral resistance (CLR).

Bearings for swing rigs I have seen made in two ways: bearings and teflon rings (not plastic!). I would advise you stick with Swing and make it work properly.
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Old Apr 06, 2015, 12:58 PM
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Chile, Santiago Metropolitan Region, Stgo
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So... as my B.5-rig is 70% of max total sail area allowed, I decided to do a new B-rig at 80% sail area. The photo below shows these two rigs.

I will now build a C-rig at 60% sail area. I will end up with rigs at 100%, 80%, 70% and 60% sizes...

(yes, I screwed up with the logo location/painting)

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Old Apr 06, 2015, 11:01 PM
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@tarmstro:
With your suite of sails you might perhaps consider a couple of differing aspect ratios.

For example:
Your A suit would be narrow, high aspect with maximum area.

Your B suit could still be maximum area but with the COE considerable lower using geometry something like the standard Dragon Force A rig (but still full class area).

Your C suit would be may 80% of full area.

Your D suit (if you wish to sail in really foul stuff) would be perhaps 65% (DF C rig as an example)

Just an alternative to consider.
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Old Apr 09, 2015, 08:48 AM
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Chile, Santiago Metropolitan Region, Stgo
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mrPenguin:

I did consider designing a B-rig at 100% sail area and lower CE, but in the end I decided against it based on these ideas:
  1. My boat is very light (less than 1kg displacement), and in consequence has a very low overall center of gravity. This means it can stand stronger winds in A-rig than other boats.
  2. We sail from 0.1kt in the morning to 25+kt winds in the afternoon of the same day. So I need to have a big A-rig and a very small C-rig available on the same day.
  3. As we are restricted to 3 rigs on any event (rules!), the B-rig has to be something in between...
Hence, 100%, 80% and 60% sail areas for a typical day.

The 70% rig will be reserved for those days when the wind blows from early in the morning, when I know for sure there will be no need or the A-rig.
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Old Apr 09, 2015, 05:09 PM
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@tarmstro:
Good planning, you are way ahead of me!
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Old Apr 15, 2015, 09:42 AM
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Chile, Santiago Metropolitan Region, Stgo
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New update:

Last sunday I finished 2nd overall . Much better handling and less tactical errors this time. Lost to 1st because too much errors, as always . Won to 3rd in the last race, by finishing ahead (needed the point!) and finishing first (best individual result, Rule A8.1) So I was almost 3rd .

Sailed all day with my new B-rig, which performed flawlessly. At one point I was in the water with my smaller B.5 rig, and two minutes to go I decided to switch back to B-rig. Managed the swap in 90s and was back in the water just to cross the line after the gun. Turned to be the right thing to do! So that part of the setup (changing rigs) is proven: swing rigs are easy to swap.

I am happy with the sail build quality I've managed... not perfect but good enough. So the future is finishing C-rig for storm days, and concentrate on handling and tactics.


RG65 Results: http://www.cvrc.cl/wp-content/upload...tado-RG65.html
Full-Day Report: http://www.cvrc.cl/2015/04/15/result...-victoriarg65/
Photos: https://plus.google.com/photos/+Cvrc...92189755564865
Videos: https://www.youtube.com/playlist?lis...2l3kfcVO5ylbER
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Old Apr 15, 2015, 09:45 AM
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Well done Thomas - my congratulations.

Dick
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Old Apr 15, 2015, 01:08 PM
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Indeed, congratulations! Also thanks for documenting and sharing your experiences so thoroughly.

I (finally) cut stations for an Esteral H last night. Now to prepare the building board and fix the stations in place.
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