Arne Kverneland wrote:

Ouch, Annie,

it appears that you were so close when rigging Fantail. Only the slingpoint was a few inches too fare forward on the yard. I didn't see this until I compared your rig with the rig of Footprints. I guess I must write a note about it in the "Peaking up the junkrig" write up...

Arne

Ouch, Annie,

it appears that you were so close when rigging Fantail. Only the slingpoint was a few inches too far forward on the yard. I didn't see this until I compared your rig with the rig of Footprints. I guess I must write a note about it in the "Peaking up the junkrig" write up...

Arne

Good, Bryan!

I haven't cut hollow in the leech of my last sails. Somehow I forgot to do it on both Frøken Sørensen and Ingeborg. Ingeborg's sail has not been tried yet, but at least, the sail of FS is perfectly free from flutter. I guess that has to do with the little bagginess even in the top panels, plus the stout webbing type boltrope. The only way to make a leech flutter, is to let it be slack, and that can never happen in the top panels of my sails.

Arne

Bryan,

I am not sure what you mean. Hasler and McLeod describe scalloping as a result of the wind pushing on a flat sail, which tends to blow a little vertical curve into the batten panels, along the whole chord of each panel. I certainly want the luff and leech to stand as straight as possible. In my sails, that happens almost by itself: Since I cut fairly deep bagginess into the batten panels, I think that reduces the tendency of the wind forces to pull the battens together, i. e. making the panels (and luff and leech) scallop. I certainly don’t use any external luff and leech lines to produce any scalloping. Normally the luff stands straight in my sails, except the lowest panel, if there is no downhaul on it. The leech, which takes the forces from the sheet generally stands quite straight, maybe except on a run, when the sheet forces are more horizontal than vertical.

Clear as mud, right?

Arne

PS: On this photo Johanna is sailing with one reef. There is no downhaul in the fore end of the sail (only the THP). As a result, the luff of the lowest setting panel naturally will scallop. I can live with that.

 ( See My Boats, Photo 4)

Bryan,
I am glad to hear that Fantail performs well to windward in a blow, but I am not surprised, really. Fantail has a good hull with plenty of keel, ballast and rudder, so will take care of you. Fantail also has a fairly short, light and slim  mast (compared to all-wooden masts), which definitely is an advantage here. I also found that even my first, perfectly flat sail (on Malena in 1990) worked quite well in a blow. The big advantage of the JR, apart from saving us from working on a jumping deck, is that it is easy to set the right sail area for the conditions. Camber and pretty setting of the sail seems to matter less in such conditions. Remember, in strong winds, the apparent wind is closer to the true wind, so we can point surprisingly well on the compass or GPS.

The reason why I make a bit camber in my top panels, is not only to cope with light winds. I find that the little bit of bagginess ensures that the reinforced leech stands taut, and never ever flutters. I think avoiding fluttering is important to make the sail last.

Arne