The manufacturer states in his manual to put the first reef in the main at 25 knots en the second at 30 knots. The foresail must be reduced in 35 knots as well.
co advises to put the first reef in at 18 knots (apparent) and the second at 25 knots. Or visa versa, forgot this.
seems to advise against a full foresail without a main (manual not clear due to poor English
(or my understanding of it); the charter
co does not object.
We did sail with a full rig in (really steady) 21-23 knots of wind
(80-90 degrees true)and felt completely safe zooming along at up to 9 knots (top was 10.1). We put in the first reef at 25 knots and maintained speed. Putting in the second reef when getting near the 30 knot
mark failed (tangled reefing line) and we dropped the main (another advantage of cats: the main drops perfectly in a couple of seconds) completely; this was the end of the fun, speed was reduced to 5 knots under full jib
Note: we were on a two week island hopping vacation
and not really 'cruising'; I do understand all comments about reefing early when on long trips; ours were 40 mile island hopping (ANU to SVG) day trips.
My biggest concern (as a first time cat sailor) was that the boat never showed any signs of being overpowered, the main stayed in a good shape. The only thing that happened was that the leeward shroud
became a little slack, not uncommon I think; have seen this on mono's as well. The Lagoon
did not seem to object; still the charter co suggested to reef at 18 knots. We did this on our last crossing (windward side of SVG) but it took some of the fun away: just 7-8 knots in 21 knots wind with first reef in.
When and how do you reef? On a mono it's easy, with too much sail up the boat heels over too much and eventually rounds up by itself.