Just for comparison of mast positions, here are a couple of approximate "fits" for SJR rigs. They are approximate only and sail area was just a guess. They will, however, give you a good rough idea of where the mast would probably go with SJR.

I took a vertical line through the geometric centre of the lower sail panels, and fitted it over the "Centre of Effort" which is shown in the bermudan sail plan. This has been shown in the past to give a satisfactory result for SJR.

From this you can say with reasonable confidence that a normal SJR rig will put your mast just a little forward of the original mast position, somewhere within the area of the forward hatch.

(You can click on the image for an enlargement. By rough measurement on the computer screen, the one on the left (the "Poppy") shape, has a aerodynamic balance of about 29% and the mast seems to go through about the front of the hatch.The middle one (the "Amiina" shape has a balance of about 33% and the mast seems to go through about the middle of the hatch. If you were to follow David's advice and opt for 25% balance, your mast will probably come through the front edge of the hatch or the front of the cabin top or thereabouts.)

As you can probably guess, a Johanna-style rig as referred to by Arne, and a Weaverbird wingsail rig as referred to by David, with their lower balance, would be expected to put mast position forward of the cabin trunk and into the fore deck.

A lovely classic hull shape, if I may say so.

Ryan,

except for the longer stern, the Alberg looks quite similar to a Folkboat, only larger. I think the rudder sits far enough aft to handle a sloop rig, (or a yawl). If you look at the sailplan and keel profile of my Marieholm IF, you will see that they have much in common.

Good luck!

Arne

Hello Ryan,

Generally speaking, it's best not to go to a two masted rig until a single sail gets to be of such a size as to be unmanageable (though there may be other factors in play such as the availability of a large single mast). At 30ft LOA, I'd try to stay with a single mast. Looking at the profile on sailboatdata, it seems to me that the mainmast of a schooner would foul the sliding hatch - but perhaps you have plans to change that to one of the non-sliding alternatives?

You may have plans to rebuild the accommodation to a different plan, but with the original, a single mast would be reasonably conveniently placed between the V berths.

Agreed, the rudder is not particularly effective, so you might go for either a SJR, or a high AR sail, to keep the helm balance better downwind. I think you have enough stability to put in a high mast, if you can get a tapered aluminum flagpole - there are several sources in the USA.