It looks good to me, Eerik. As you can see, the top panels stand well, even if they have a little camber in them. The lower panels will probably be fine when you give the THP a good tug  -  or you will need HK parrels (..which everyone except I seem to  dread...).

You may find it wise to add a light yard extension to its peak. That will keep it from fouling the lazy-jacks. I have found the yard extension useful for another reason: It lets me set a burgee or telltale well away from the sail to see the wind, unaffected by the airflow around the sail.

Good luck!

Arne

So, eventually, after making some tests, I went for the third option, the „sailmaker’s way“. Not easy... But my just 6 panel sail I managed to sew together. You really would need a big table so the sail wouldn’t get stuck when inserting it through machine. But I got to try it ;) I used tape to attach the panels together, then sewing; so the third stich was not needed. For upper edge of each panel I marked 2 hem lines – 15mm and 45mm, for lower edge just 45mm. Placed the upper panel on top of the lower, upside down; lined it with the 15mm hem line. Folded the lower panel hem back, on top of the upper panel, at the 15mm line; then folded it once again at the cutting edge. Each time it had a tape to hold it in place (in different place on every fold); then folded the upper panel over the seem and voila – ready to be sewed. Tape held it together well.

When all 6 panels were attached to each other – I laid the sail on the lawn to check if it looks anything similar to one on the drawing board. Doesn’t look too far away. With some elegant pockets. The forward pockets I made from PVC coated fabric, similar to one used for truck tents, for wear resistance.

Now what is left is hemming; webbing type boltrope, tell tales, some sloops and hoops. For folding the hem I will use tape again, and stitch the hem and webbing in one go.

For the sailcloth I used, as mentioned, the Odyssey fabric; which I couldn’t get here in Estonia, so had to order it from England. Unfortunately I haven’t been so lucky with tubes for yard and battens – there are only 2 alloys available here (to buy or to order) here – 6060 and 6063; and I haven’t got a solution for that yet. 6061 T6; 6062 T6 or 6082 T6 were what I was looking for. Will see how that goes...

Actually, Arne,

It seems to me that I have been a good student of yours, as I have already reduced the number of panels by 1, so having just 6 panels. The aspect ratio is 1.56. Comparing your samples, the batten to batten / chord ratio is between the 1.9 and 1.95 AR samples, so shoud be perfectly average. Your input, however is and will be highly apreciated! :)

Regards,

Eerik

Time has passed without having much to report. I have been away due to work and not being able to work on sail during wintertime as planned, but now I have a bit time again to proceed. I looked into calculating the round. First I tried to use the table from chapter 4 in Arne's files, but my aspect ratio was out of the table, so I bought a chain, rechecked if my chaincalculator has similar values to those in Arne's table (which were close enough); and calculated mine. For tho chord of 3190mm, 8% sail camber is 255mm, chain camber 306mm (I am a mm man), and the round turned out to be 132.5mm. It some what differs from the simplified method's result from Arne's chain calculator's 55% of the camber - my result is 51.7%. This may be because of using different chain but also my batten to batten distance is considerably shorter. So when making templates for panels, I will increase the round a bit, possibly getting a bit more camber than planned. I have planned to use the Odyssey fabric; hope to get to sewing shortly...

Regards,

Eerik

eerik mee wrote:

Boat of the month, and Arne's article "Frøken Sørensen       From Bermuda to junkrig" seems to give me all the missing answers: for 20 sqm sail is used Odyssey III cloth (which according to information from another topic is now just Odyssey); For battens 22x2 alloy tubes are used which are too bendy, so would be wise to be increased in size.  The third batten is heavier - is this a common practice or is it just that the others are made lighter?

When lookig for information about Odyssey - I found what I believe many sails here are made of; but is actually not specified as sailcloth:

Odyssey:
• Impregnation coated, 100% woven Polyester suitable for
many indoor and outdoor applications
• Mildew and UV resistant
• Superior water and stain resistance
• Very low shrink or stretch
• Breathable
• Uses: Boat covers, canopies, bags and miscellaneous
covers

Is this the cloth I shoud be looking for?

Edit: But then, it seems to have right and wrong side; so this can't be it...

 

Regards,

Eerik

Eerik

At least on my sails it is common practice to make the longer batten 2 twice as strong as the others. I have done this on three of my junksails now, after I bent batten 2 on my Johanna, back in 2003.

Sailcloth.
you will see lots of opinions on this. The cloth will be good, but how long it will last seems to depend on where you are to sail your boat. Later experience seems to show that Odyssey III will not last that well in the tropics (but then Estonia isn't very tropic...)