by Roger » Mon Jul 20, 2009 12:50 am
Unless you are restricted by class rules, you can add any sail to any boat, as long as it fits or can be made to fit. The sail you speak of is 10' on the foot, where the original was 6'. Assuming the corresponding additional area is proportional, I would suggest that by standard measure, you have a 170 which technically would fit into the Drifter or even DRS (drifter reacher spinnaker) category. A drifter is typically a very light sail, (similar to spinnaker cloth) with a bit of draft, (more than a genoa, but not as much as a spinnaker). It is typically used in very light airs, and is not typically a good upwind sail. If it has a big belly, it may be an asymetrical spinnaker although that is typically obvious. Other clues are the cut of the luff, and any assymetry built in to it. IE, the leech slightly longer than the luff. There is no luff wire in a drifter typically.
If it is made of regular sailcloth, (3.5 oz) and looks like an oversize jib with little draft, then I would think it might be a genoa for a larger boat. That's not uncommon either.
Standard measure is to divide square footage of the sail by the square footage of the foretriangle. The percentage, (in your case 166.666) rounds off to a 170. I think the largest genoa would be around the 150 mark.
Hope that helps.