Will try and answer all the questions in one go and sorry for not getting back sooner but was just having to much fun sailing the 20!
We ordered the boat through Nacra Europe. 10 years ago we were supplied Nacras from Australia but have to say these ones from USA are streets ahead in fit and finish!
Mast rotation arm was standard kit when we ordered the boat.
Single spreader mast setup also has the single set of diamond wires terminating in a single large turnbuckle - way nice and easy to adjust. We have 1 lonely old N6.0 here and I could never understand the double diamond set up on that.
Our conditions are pretty mild for most of the year. Off-season our winds average 12-15 knots and 'on'-season 18-24. Water is flat as Singapore is surrounded by other land masses, but at 24 degrees C - it's warm. Ambient air temperature is 28-32 C year round. But the beer is cold!
It will be an interesting season here (December - May) with the F16 Vipers having to share the water with the 20!
On Sunday we added a little more rake to the rig and that gave us an extra knot of boat speed both downwind and up. But we still haven't pitted her against the better Vipers yet and that will be interesting as we spent a lot of time getting the Viper to point super high upwind.
As for sail and mast measurement stuff. Am not really sure but what I can tell is that a lot of effort has gone into getting the main to work with the new rig. It responds to everything you do i.e rotation, down-haul and sheet tensions. It's what really impressed me. We've been sailing the Goodall setups for about 9 years now and I know he's spent the better part of 20 years dialing it in. Pre-receiving the 20, I was afraid we'd lose some of this finesse but after the first sail, my 'fears' were no more - this is sweet!
We won't get our 'real' wind until the end of December so this is really a good shake down period to get it all dialed in and will soon pit her against one of our better Vipers just to compare upwind angles.
Interesting times coming right up...
