I did do a full weight and cost analysis and I'm hovering around 2500 Euro's for homebuild boat were you buy the rudders and stocks of a commericial company.

In the way of weight analysis, my 6.400 mtr long unstayed mast comes out at 10 kg or less and this is 1.5 kg per mtr. I don't think this to be too heavy especially if you recognize that most weight is concentrated low on the mast where the mast is widest. The unstayed rig is tapered you see, where the mast at the bottom is 60 mm wide with 5 mm wall and at the top is 40 mm wide with a 2 mm wall. The centre of mass is at 2.5 mtr (or less) instead of at 6.4/2 = 3.2 mtr as would be the case with a untapered conventional mast section.

This data is dependable as I have measured and sailed with 3 different kind of unstayed masts on my landyachts and these masts take a good amount of abuse. The landyachts have 5.5 to 6.5 sq. mtr of sailarea and easily lift a 50 kg cart with a 90 kg skipper of the ground. That is in the wind we sail our landyachts in.

This is one reason why my F12 will have a unstayed rig. The other is that the rig you can have with an unstayed mast is so easy and so quick to rig and unrig. Pretty much it is a sleeved mainsail that you shoove over the mast before stepping the mast. Fully rigging my landyacht from the trailer takes a few minutes at the absolute maximum. Derigging is done under 2 min. I really would like to have that feature for my F12 design as well.

Having said all that, I think it to be very healthy to explore different routes, so please continue developping the stayed F12 !

Afterwards we'll compare all designs and settle on the most promising.

Wouter