The Junk Rig Association - alacrity 19 junk rig conversion

24 Jul 2026 18:00

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Reply # 13656777 on 13157804

Anonymous member

Thanks for the kind words.

Paul, my mooring is at the westcoast within sight of the lighthouse of Friedrichsort. Probably we will see each other soon at the fjord!

Graeme, yes, I have documented a few Photos of the most important construction phases, as well as some of the problems I encountered and the solutions during the construction of the rig. I can also imagine writing about it in the magazine and I would be happy to write an article after the season about the construction and my initial experiences with sailing the boat. In case it is of interest: Durring the restoration, I had to remove the both keels to repair them. I documented the entire process too.

After the (far to long) construction- and refit- period, I'm really looking forward to finally gaining some practical experience with the boat and the rig.

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Last modified: 24 Jul 2026 18:03 | Anonymous member

24 Jul 2026 07:06

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Reply # 13656608 on 13157804

Anonymous member (Administrator)

Well done. Yet another successful Johanna sail in the fleet! Another endorsement for Arne. If you have collected photos and made some notes along the way, it would be good to document it in the magazine, how about it? (Three years ago you did say you would document your progress!!). It looks great.

24 Jul 2026 04:44

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Reply # 13656579 on 13157804

Anonymous member

Hi Sven,

congratulations! It looks really good :)

Where is your boat located? Kiel Fjord?

Cheers

Paul

23 Jul 2026 16:13

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Reply # 13656225 on 13157804

Anonymous member

It’s been a little while since I last posted here. But now I've finally done it:

My boat is (mostly) restored, and best of all:

I've finally finished the junk rig !

I can say that I'm really very happy right now. Many thanks to the JRA, especially to Arne Kverneland for his help ! A few days ago, a friend and I made the first trip from the boat-launching place at the shipyard to the bay where my boat is now tied to a buoy. This crossing was about 14 km long and I did not need to reef the 17m2 sail, because there was only a light breeze that day. But of course, later I gave it a try and it worked just as it should have. Taken as a whole the sail was already working pretty well, even though I hadn't trimmed it perfectly yet. The hongkong-parrels and the lazzy jack weren't installed yet either, as you can see on the photos. Other details, like the sheet and the cleats aren't properly assembled yet either. I'm on vacation now and will be finishing up all the necessary work on the rig over the next weeks and doing some sailing test runs. I'm also going to install an electric motor and solar panels. As soon as I've gained some experience with the sail and completed some longer test trips, I will post an update here.

Best regards

Sven

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3 files

Last modified: 23 Jul 2026 22:46 | Anonymous member

07 Apr 2023 12:55

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Reply # 13160031 on 13157804

Anonymous member

Hi Graeme,

It feels good for me to hear that you are confident about what I am trying to do, as I don't have any experience myself to reasonably assess this. I actually have quite a bit ahead of me, as the boat also needs to be restored.

My next steps will be the following:

1.)I will buy an aluminium mast tube. Most likely yet the one described in my first post wich have a100mm diameter with 5mm wallthickness and wich weighs 32 kg . I feel better using this tube instead of the 90mm variant because I have calculated that it will withstand offshore conditions. This gives more safety reserve but of course unfortunately also more top weight.

2.) The conversion of Ingeborgs sail plan for the conditions on my boat and the start of sail construction with the help of the instructions from the „The Cambered Panel Junk Rig“

3.) As soon as the outside temperatures allow it, I will also glue the mast step into the hull and the partner reinforcements under the foredeck together with the other necessary epoxy work.

When I get that far, I will document my progress here.

Best regards

Sven

PS: Please excuse me for misrepresenting the SJR mast position in my post.

06 Apr 2023 22:10

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Reply # 13159554 on 13157804

Anonymous member (Administrator)

Sven: you have an exciting project ahead - very satisfying to see you now have a clear plan, and good reason to be confident.

For the record, one important point needs to be clarified:

You wrote: "Knowing that with the SJR the mast position can be the same as with the Bermuda Rig was actually new to me". For others who may be thinking about SJR and reading this - that statement is not quite correct. In fact it would be rare for the mast position of a SJR to be the same as with a bermudan rig.

The rule of thumb is: with SJR the geometric centre (CE) of the junk sail can be the same as the geometric centre of the bermudan sail plan.

This normally results in the SJR mast position being forward of the bermudan mast position, though not as far forward as with a lower balance junk rig. Also, this assumes, of course, that the original bermudan rig is in the correct position in the first place.

Best of luck with your conversion. Your progress will be of great interest.

Last modified: 07 Apr 2023 10:14 | Anonymous member (Administrator)

06 Apr 2023 16:30

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Reply # 13159064 on 13157804

Anonymous member

Hi Graeme and Arne

Thank you very much for your tips, all the information and especially your drawings ! I am really overwhelmed to get so quickly the necessary criticism and answers.

Graeme:

Your comment on the mast position of the SJR is interesting. I have dealt with the SJR a bit superficially before, but I was more interested in The special features of the split sail itself. Knowing that with the SJR the mast position can be the same as with the Bermuda Rig was actually new to me. Cross-reading some of some JR conversion threads, I could sometimes glean that it might be better for some boat owners if they could keep the old Bermuda-mastposition. However, on my Alacrity, the SJR-mastposition would be less favorable than the position I was originally aiming for. This is due to the really very small and narrow interior of the cabin. Without a mast or mast support at this point, the interior is more habitable for me. The further the mast moves forward, the more freedom of movement I gain.

Arne:

Your sailplan looks really great ! Of course, I will not be using my "draft" that is a adaptation and provisional, but the plan that is your suggestion. Thank you very much for that. Also for the notes about the yard angle and the effect of my faulty CE on the weather rudder.

How fortunate that I can actually use the well documented sailplan of the Ingeborg!

This allows me to start building soon instead of spending time on calculations and with the planning. Of course, this also means that I will get on the water with my boat faster.

Ps: I am really glad that I decided to post my request here !

Sven

06 Apr 2023 10:19

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Reply # 13158759 on 13157804

Anonymous member (Administrator)

That looks beautiful Arne.

06 Apr 2023 09:30

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Reply # 13158744 on 13157804

Anonymous member (Administrator)

Sven,
it is tempting to make use of existing sailplans to save time and trouble. However, in this case I found a couple of arguments against it.

· Your drawn CE sits 2.59m aft of the bow, while the CE I found of the Bermuda rig sits only 2.27m from it. I believe your sail in that position would result in more weather helm than you would like.
· The 60° yard angle I used on the Ming Ming was to let me push the sail forward and get a good helm balance without needing that jib.
· I aim for seven panels if the AR of the sail stays between 1.90 and 2.20. Reducing the number of panels is in my view false economy.

Now I found that a standard Johanna sail (Johanna 70, these days) with an AR of 1.90 and batten length B=3.40m would produce your required 17sqm. This happens to be the same planform as I use on my own Ingeborg - just a coincidence. The fore-aft position of its CE is in the same place as in the Bermuda rig. The combination of about 15-16% mast balance and 70° yard, results in a halyard angle (halyard to vertical) of just 12°. This ensures easy setting of the sail, and freedom to move the sail a bit forward or aft to get steering balance just right.

To produce a ready-to-use sailplan for your boat, I therefore suggest that you download Ingeborg’s sailplan and print out sheet 1 to 4. Then you downscale all the dimensions, using the scalefactor SF = 3.40m/4.90m =0.69388.
On sheet 4, showing the batten pockets, you may draw in your mast position, and possibly adjust the batten pockets a little.

Good luck!
Arne

PS:
The needed running lines can be found in Junk Rig for Beginners.

(For full size drawing, go to Arne’s sketches section 7, photo15)

Last modified: 06 Apr 2023 16:56 | Anonymous member (Administrator)

05 Apr 2023 23:39

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Reply # 13158332 on 13157804

Anonymous member (Administrator)

Sven,
I did like Graeme did and started by finding the CE of the Bermuda rig. That CE landed where Graeme has drawn it, and that sits over a foot forward of the CE of your JR.
I have tried a down-scaled version of the sail I use on my Ingeborg. It looks good.
More tomorrow - I’m overdue for the bunk....

Arne