Janine wrote:

Arne & David, Thank you so much for your replies! 

We (Shemaya and I) asked the flagpole manufacturer about the weight given and are waiting for a response. Will let you know when we hear back from them. 

Arne, thank you SO much for drawing the Johanna type rig! I started out with that one but got lost early on trying to figure out the total area. Your work has put it back into the 'possible list'. Thanks again!

Hi again, Janine.

Now I have done my best to superimpose the Reddish rig onto my first drawing to see how they compare.

Arne

To scale one of my Johanna style master sails up or down, it is best to use a calculator, as described in The Cambered Panel Junk Rig (TCPJR), Chapter 4.

Arne

Now I'm sure the mast weight is too high. I calculated the weight of a parallel 8.23m tube, 15.2cm diameter  and 5mm wall, and it comes to 51.3kg. But the tube is tapered, so the weight has to be less than that. I guess it's in the same region as mine, around 40kg, which is perfectly acceptable.

Now, I couldn’t resist trying how such a Kittiwake 23 would look like with one of my standard Johanna-style junkrigs on it.
I drew up a mast, reaching 8.00m above the waterline, and then tried a couple of sails, scaled down to B=4.00m. Its balance of 15% with respect to the mast gives a bit room for shifting it forward or aft to fine-tune the steering balance.

The tallest sail which could be used with that mast, was the one with AR=1.90. That one happens to be the same as I use on my Ingeborg (except B=4.90m on Ingeborg). As can be seen, this sail gives a respectable sail area and luff length with a not too tall mast.

As for the control lines, sheet, etc, I use those shown on Junk Rig For Beginners, plus a Fan-up preventer.

The advantage with the sails with an upright leech is that one avoids having any sheet-batten tangle. Several identical panels also speed up the construction of the sail.

Just a thought

Arne

Janine,
that looks like an elegant little boat for a JR!
Now, I have looked on the numbers, and it seems to me that the mast is a bit on the strong (read: heavy) side. It will add about 5% to the weight of the boat. It is not extreme, but it is a bit heavy. If I had that pole and could not find an alternative, I would use it, but if I had a chance, I would look for one with a bit smaller section. I know 6-inch masts have been used on boat in the 2.5 ton class. The 6063-T6 alloy is also very strong, so that is another reason for stepping down one size.

Anyway, if you have to use the pole you have, and are to cut off some excess length from it, I suggest you cut at the thick end.

That hull is probably very easily driven (similar to my Marieholm IF), and to keep the mast as short as possible, I would just use that 6-panel sail as it is.

However, I suggest you build some camber (bagginess) into each panel, in particular in the four lowers, and also make use of Vincent Reddish’s method of inducing twist in the sail, to add (and control) camber higher up.

Good luck!

Arne