Making the Rig:

Thursday 14th October 2010

Whilst this was drying off, I then set about sketching up the rig.

I decided to follows the Plans for the Rig, and on a large flat piece of cardboard, accurately sketched out the proportions of the rig from the thumbnail sketch given on the plans. 

The mast position was included to help with getting the balance of the rig  so that excessive weather or lee helm was not present when setting the whole lot up the first time.

The roach of the sail was drawn in free-hand and looks about right!

The Centre of Effort of the sail was then drawn out and established by finding the centre point of each side of the sail and then drawing a line to bisect the opposite side. 

Where the three lines crossed (in practice, a cocked hat) this was the C of E of the sail.  This was found to be 3.5mm behind the mast position.

The fin will be offered up to the hull, which will be laid on its side beneath and in line with the rig to see how the C of E of the sail sits with respect to the Centre of Lateral Resistance of the fin. (C of LR)  In theory, the C of E should lead the C of LR by aprox 5-10% of the hull length – we’ll have to wait and see…………