I think weight is just one of the things that can hold you back
Blokarts have weight racing classes in their one design racing so obviously it has a large effect and they are trying to make the racing more level
Most people think the wheels and tyres are where it has the most effect
I would be interested like you if anyone has some definite answers and figures

Well I will put my ten Cents worth in here.
Weight is one of those things that is a trade off thingy. Less weight faster in light winds or the lighter the winds you can sail. More weight is proportionally the opposite. Where as one can't sail in too lighter winds one will spend more time on 2 wheels in higher winds. I am having just those problems with Occum's Razor at the moment. It would seem that the winds are neither your Ass nor your Elbow. Either you have to fight to keep moving or fight to stay upright. "Stay Upright" now there is a WISH that would seem to fit many of our members as we are getting to be Old Farts.

"Stay Upright"
Ron

by inspiring 1 person they will have a mate that says "i want one two"
you'l l reach critical mass in no time
on the weight thing, you can just keep getting lighter and lighter, until the yacht just gets wobbly, eh clem