Well, I was not that young in 1994, as I rounded 40 that year. Still, I must have been considerably more agile than today.

I was in full job. In addition, I spent a lot of energy on a referendum campaign which culminated the 29. November, when Norway said no to membership in the EU.
In addition, or in between, I made that blue barrel-cut sail for Malena and got in some sailing with it. Finally, I produced that write-up, signed 4^th December (.. it  took another ten months before it was printed in NL 30).

Another scientific work about the JR was finished and published in 2000 by Joddy Chapman. I suggest you start with Chapter 8  -  the conclusion.

Arne

Some research done by students at The School of Engineering, Exeter University on behalf of the JRA may be relevant to Paul's investigations.

There is a write-up in the July 1995 Newsletter (Issue 30).

Incidentally, the same Newsletter also records a rather historic event: '... how I made a cambered junksail using straight battens ' by young Arne Kverneland.

Junk rig association returnee here unfortunately nowadays only able to sail an imaginary junk rig armchair. But many years ago when I was young I sailed back from France in a snow storm. It was in a pointy rig yacht but the flow of air through the slot could be seen, we played around with the sheeting positions to see the difference it made. Perhaps we could persuade a junk rig owner in the north to keep their craft in commision during the winter. Maybe funds could be made available to provide a bottle of Scotch to keep the crew warm.

Tufting Results

Well, after a little more sailing I gathered quite some footage to be evaluated. I tested different courses to the wind, and always sheeted to have all leech telltales flying. Conditions were from F3-6, beam reach to close hauled, gentle seas (more or less).

Today I went through all of the recordings, only to find that they all show the same: regardless of wind speed and course, all tufted telltales fly horizontally - at least with the sensors at hand: my eyes. It also didn't matter if on port- or starboard tack (only the two most forward measurement points were indicating the detached airflow on port tack, not shown in the sketch). The following sketch sums it up, with heeling corrected.

Not that much learnt from this experiment, except that the air is flowing horizontally. Great, finally we got that secured...

However, what I could observe clearly is that the telltales do not point more upwards on windward than on leeward - which would be my expectation when a tip vortex is formed. However, as my measurement method (eyesight) is rather rough, and the upwash and downwash due to the tip vortex forming is rather small, this tells us nothing.

Hm. I do not trust this little experiment of mine. Too much noise, too rough. A lot of wrong indications could be drawn.

It was, however, nice to watch this woolen horde stream happily while sailing :-)

Paul

PS: Do you wear a smoking when smoking?

I wouldn't go so far as to call myself a bee keeper but I did build two top-frame hives that I have in the orchard and the bees are welcome to come and go as they like! I very rarely smoke bees! (very hard to roll up in a rizla paper!) 

Came across this while inventing something else entirely unconnected with sailing:

Pyromaniac's dream...