A Photo & Discussion Forum for Wharram Design Enthusiasts
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
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!!!
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.