I have had a good look through the forum. There is a lot of talk and questions, but no figures. I am setting up and old Mozzie (about mid 90s) and any help would be greatly appreciated and may speed up the learning curve.

As for min crew weight, most classes have a very distinct competitive weight range where you will be competitive in both light and heavy, whilst not get smashed on the downwind. I would imagine under 70 kg you may find it a little handful upwind. Over 80 kg I would imagine you will not loose that much upwind in the fresh breeze and may have a slight edge, however will suffer a lot off the breeze. I am currently between 72 and 74 so should be OK.