Hi all of you,
I read in PJR that "to be preoccupied by theory is often a sign of inexperience, and a reason for not gaining more experience".
I certainly do not have any experience of junk rigs and I may be too preoccupied by theory.
However I think I should not be suspected of not being able to go ahead with the whole project as you suggested twice Arne.
Concerning my animations, Annie, "a resource that most of us do not have access to ", they are easy to make : Delftship (a freeware to model boat and sail) , a few screenshots copied in Gimp (another freeware) , and export to Microsoft Gif animator (a freeware) . I understand you are known for your book "Voyaging on a small income ".
I hope you did not mean JRA website and its technical forum is a DIY site only for low-income people.
I have never written I intended to make myself Ar Vag melen conversion to junk rig.
I just said junk rig questions are just about unknown in France which explained I needed help for this conversion of Ar Vag melen.
I shall have to explain to a local sailmaker the reasons for the unusual sail he has to build, to a local boatyard why should he cut the mast and have a mast crane being made as suggested by PJR, how he should rig this new mast ...
Suggesting I should make a scale model is just presently of no help. Which sail model ?
Until a sound sail project has been designed, what will a scale model be worth ?
Before the Tilapia, I had an ETAP 26 with a classical Marconi rig. It was equipped with lazyjacks and a downhaul sail rope. I then may measure how "stagger" theoretical PJR compass evaluations are far from reality as with a 200g/m2 Dacron sail the reefed bundle has just nothing to do with what is theoritically supposed to be. A model wont help, flexibility of the textile or plastic model sail, weight of model battens, ropes and blocks sizes ... being so different.
No scale experiment may be useful until theoritical issues have been fully investigated. Nasa certainly did not send men to moon until having thought they had solved most, if not all, theoretical problems.
For this purpose I shall have a close look to David last statement that "mast hoops or parrel beads are not going to work here - the sail is going to need to swing forwards as it comes down".
Another statement I do not immediately understand just as this question of a differnece of friction between short and long batten parrels.
Claude