Hi John
I weigh around 75kgs and have a MK2 Landy mainsail. After racing in moderate to strong winds and advice of John Pearce I took the decision in 2007 to have Grant Piggott re-cut the Luff to flatten the sail. Now the max curve of the Luff is 90-95mm. I feel I am more competitive in stronger winds but have to be really careful in the lighter stuff in regard to sail tuning. So I think the newer Landy mains are a great sail for the heavier single hander and two up crews. However, Grant's mains are obviously very similar in shape to the Landy with just a little less foot length and slightly longer leach.
I guess we have a slight difference of opinion but that could just be because of the difference between the MK1 and 2 Landy mainsails.
As for Grants sails being better for 2 ups & heavy weights I'm not aware of any 2 up teams using them at present.
P.S Grant made his first F16 Kite for me using the measurements I supplied and it's hot.
Grant and I designed the mainsail and the Kite was a collaboration of measuremnts supplied from Mark and taken from my Landy Spi which was designed for the dropped bow fitting (and thus longer pole) of the 2007 Stealth.
The brief for the Spi(I had no 2 after Mark) was to make a flatter sail that, as a result, would need to be driven harder to get results, but after experience with Inter 17 kites and having Grant make me 2, I was certain flat was faster - every kite Grant has made me has been flatter than the one before. As mark says, they are hot!
The mainsail was driven out of my belief that the landy sail was too full for the lighter sailor and that more area up top would be faster overall and easier to control in a blow.
We were aiming to build a flatter sail than the Mk2 Landy with more area in the head, as a result the foot would have to be shorter.
I've not sailed my Stealth 2 up yet, but hopefully will be in the next couple of weeks and will report back.
From sailing with both the Mk2 landy mainsail and GP single handed, I can report the GP is more powerful as there is more area up top AND is more controlable as you can twist off the head more easily than the Landy - however the sheet loads are higher with the GP sail. The GP has less luff curve than the landy sail.
