Hi Michael:
Three years ago, I substituted the No. 1 Genoa on my roller with a No.3. I used the same dimensions that were specified in the Albin Ballad manual but went for a slightly heavier fabric. The area where I sail in has either very little wind or quite a lot of wind so, with the No. 1 Genoa, the boat was either underpowered or overpowered. I use a gennaker as a light-wind sail and have been thinking of putting that on a roller. I've been very happy with the performance of the Genoa 3. On a run, it can be poled out to windward with the main goose-winged, or tightened inside the lifelines while beating. On both occasions, I've seen speeds close to 8 knots. Also it's easier to tack and with the high clew the visibility is greatly improved.
Nicholas
Moments of Clarity #334