Wharram cats rigged with one free junk rig on each hull

[Bertrand FERCOT]

At the end of May we sailed to Southampton to join the Summer Junk Rig Association rally.
When sailing back we anchored in Aldernay harbour and we had the very good surprise the next morning to see a Wharram cat AORAI rigged as PHA with a junk rig on each hull motoring into the harbour.
There are Susi and Tom, a young German couple sailing from Berlin toward the Quebec via Spain, Madera, Canarias, Antillas....
Here is their website : http://www.aorai.eu

The tomorrow we sailed together toward Brest with a light east wind. They were slightly quicker but we kept them in sight all the day.

Here is a picture when leaving Alderney :

And here is our 2 cats together on PHA's mooring on the river Aulne :

Bertrand

[Bertrand FERCOT]

Just a little mistake, our meeting with the Tangaroa "AORAI" was at the end of last June.

As unhappily our Belgium friends Cynthia and Jean-Paul builder owner of the Tiki46 APATIKI don't join the Wharrambuilders group, I put here 2 photos of their twin junk rigs I made when helping them to finish to rig the sails and having the chance to share with them their first sailing. She is the first Tiki46 sailing with a such rig :

Bertrand

[Rudolf van der Brug]

Hi Bertrand,

I am new to the group. Very much interested in Junk rigs, especially swing wing.

How was sailing APATIKI?
Was it very different compared to your own? Their battens seem very light on the photos.
What was the sail area on APATIKI?
And what will be the area on PHA#?
And on PHA?
Regards,

Rudolf

[Bertrand FERCOT]

Hi Rudolf

I sailedl only one time Apatiki for her first sailing test.
The wind was weak below 10 kts with all the sails and she seems to sail correctly at all the points of sails but I don't have the opportunity to check the angle between the tacks. I was very satisfied to see she tacks easily as my Tiki30.

Each sail is (as for my Tiki46) 55m². It seems there was a problem of designing with their aluminum masts because only the simple fact to haul up the sail was enough to bend the top of the mast. So after, to don't damage their masts they reduced very quickly the sails when the wind sped up.

During the last summer they sailed until the Corsica and they reported they used only one sail to don't test she too hardly.
About the sails, there was some problems with their articulated battens : they loosed some conical junctions on their articulated battens although the sails were well tightened on the battens, perhaps due to the elasticity of the sail cloth?
I hope they will be able to take a few time to tell us their own sailing experiences during the last summer.
I have no news from them since last November when they visited us. Their plan was to rebuild there masst in cutting 5m at top and extending the bottom of 5m.
A few time latter they advised all their friends they decided to limit their second web blog to only their family due to health problem. I wish they will sail again aboard Apatiki in a few months and they will share there new sailing experiences.


After about 6000 miles of sailing aboard PHA, I'm globally very satisfied with her twin Swing Wing rig. I tested she in closing the wind until apparent gust wind of 25-30kts with all the sails up without problem. The masts in wood are very strong.
Her ability to close the wind is equivalent to a cruising monohull and this last years I try to improve her power under sail in modifying the wishbones. For PHA# I'm designing lenticular wishbones with an arc of 90° (equivalent of a camber of about 20% of the chord) . As I'll use the same curve for all the wishbones, this camber will be decreasing toward the top of the sail.
Now I have to wait our first sailing tests at the end of next Summer to know if my idea is OK. But before her launch I have a lot of works to do

Bertrand

[Damon Urban]

Hey Guys. I'm thinking of building a Tahiti Wayfarer as a test bed for this rig. I'm wondering if the dual junk rig is suitable for smaller boats like the Wayfarer. Any experience with the dual junk rig on smaller cats? Any reason this rig wouldn't work on a 21 foot boat?

Bertrand FERCOT said:

Hi Rudolf

I sailedl only one time Apatiki for her first sailing test.
The wind was weak below 10 kts with all the sails and she seems to sail correctly at all the points of sails but I don't have the opportunity to check the angle between the tacks. I was very satisfied to see she tacks easily as my Tiki30.

Each sail is (as for my Tiki46) 55m². It seems there was a problem of designing with their aluminum masts because only the simple fact to haul up the sail was enough to bend the top of the mast. So after, to don't damage their masts they reduced very quickly the sails when the wind sped up.

During the last summer they sailed until the Corsica and they reported they used only one sail to don't test she too hardly.
About the sails, there was some problems with their articulated battens : they loosed some conical junctions on their articulated battens although the sails were well tightened on the battens, perhaps due to the elasticity of the sail cloth?
I hope they will be able to take a few time to tell us their own sailing experiences during the last summer.
I have no news from them since last November when they visited us. Their plan was to rebuild there masst in cutting 5m at top and extending the bottom of 5m.
A few time latter they advised all their friends they decided to limit their second web blog to only their family due to health problem. I wish they will sail again aboard Apatiki in a few months and they will share there new sailing experiences.


After about 6000 miles of sailing aboard PHA, I'm globally very satisfied with her twin Swing Wing rig. I tested she in closing the wind until apparent gust wind of 25-30kts with all the sails up without problem. The masts in wood are very strong.
Her ability to close the wind is equivalent to a cruising monohull and this last years I try to improve her power under sail in modifying the wishbones. For PHA# I'm designing lenticular wishbones with an arc of 90° (equivalent of a camber of about 20% of the chord) . As I'll use the same curve for all the wishbones, this camber will be decreasing toward the top of the sail.
Now I have to wait our first sailing tests at the end of next Summer to know if my idea is OK. But before her launch I have a lot of works to do

Bertrand

[Bertrand FERCOT]

Hi Damon

Yes, you can test this dual junk rig on a Tahiti Seafarer. So you'll have a good experiment to learn how it works and how easy it is to reef it.

Bertrand

[Damon Urban]

Thanks for the feedback Bertrand. It's nice to hear that from someone with so much experience. I've been studying your mast steps and thinking about the best way to step the masts in an open top boat like the Wayfarer. I'm also thinking a Yu Loh (Chinese sculling oar) would work well with a dual junk set up (simpler and cheaper than an outboard).
There are lots of small estuaries and rivers to explore here in coastal Maine so mast tabernacles would be nice as well. I've read several accounts of traditional Chinese junks with tabernacles. It seems the rig lends itself well to tabernacles. Have you considered them on any of you projects? Any thoughts about design?

[Bertrand FERCOT]

Hi Damon, no I've not so much experiences with the junk rig. I'm only very curious and very attracted with this rig.
For the little boats it's easier to hold the masts in tabernacles and in looking at the datas of the Junk rig associations " http://www.junkrigassociation.org " and on the Yahoo group " http://groups.yahoo.com/group/junkrig/ " sure you'll find good examples with little boats with tabernacles.
I studied a short time to put tabernacles on my new Tiki46 but it seems to me very difficult to build them enough strong without to be too much heavy and large. So they will be hold by the keel and the deck with no tabernacles.
As the Tahiti Seafarer is built with open hulls it's possible to have a twist of the hulls (not when the hull is completely closed with a deck). So I think It should be better to fix your tabernacles near a beam.
Bertrand

[Scott Burger]

Bonjour Bertrand:

I have the Practical Junk Rig book. I see that Blondie has the formulae for setting up a monohull. If I understand correctly, I just do the same thing for both hulls?  Also, on your junk rigged catamaran, did you route the lines to the steering pod?

Merci beaucoup pour votre aide et Bonne Annee Nouvelle!!!

Scott

[Bertrand FERCOT]

Hello Scott

Yes for a parallel rig you have to calculate where to put the mast as for a mono hull.

On my previous Tiki30 and now on my Tiki46 only the sheets are handle directly from the pod. The halyards and down hauls are handle on each side of the pod on the roof of the hulls. Have a look at the photos on my blogs.

Have a good 2016 New Year and all the best for your cat.

Bertrand