Just about all our club racing is done with a mix of yachts, dinghies and cats. We have separate starts - fast yacht (everything from Mumm 36 to Bendytoy 28), Hunter 707 sports boats, slow yachts (and some are very slow yachts..), dinghies (mainly Lasers and Blazes these days) and then the proper boats (Hurricanes, Stealths, Darts). We use fixed marks and the yacht courses will tend to be much longer than the dinghy/cat ones but we will often share the same water with them. It isn't usually a problem but you do have to be wary of yotties who underestimate our speed sometimes. On the whole they're used to us and most know what to expect.

The only time I've been worried about racing on the same water as monowobbles was a regatta where a big wind shift meant that the cats could bear away at the hitch mark and point straight at the bottom mark. Unfortunately there were about 80 dinghies trying to sail triangles in the way. And it was blowing F5...