7.2.1 The mast may be stepped on the deck or into the hull. With the mast spar perpendicular to the base line, the after side at deck level shall not be less than 3048mm and not more than 3202mm forward of Station
11. The mast spar may be fixed or rotating. No dimension of the mast spar cross section shall exceed 102mm.
7.2.2 A maximum of 30mm mast spar curvature is permitted.
7.2.3 Limit marks not less than 10mm in width shall be placed round the mast at the following three positions measured with the mast standing perpendicular to the baseline.
- Deck limit mark: upper edge level with the top of the deck. – tolerance 1 mm (mast datum point).
- Lower limit mark: upper edge not less than 381mm above the mast datum point (lower point).
- Upper limit mark: lower edge not more than 6858mm above the mast datum point (upper point).
- The top point of the mast spar shall be not more than 7011mm above the mast datum point.
7.2.4 The spinnaker hoist height shall be not more than 5955 mm nor less than 5054 mm. No rigidly fixed point for attachment of the block, sheave or fairlead shall be more than 35 mm from the surface of the mast spar.
7.2.5 The highest point of entry onto the block, sheave or fairlead for the headsail halyard shall not be more than 4750mm and not less than 4648mm above the mast datum point. A prolongation of the luff of the headsail when set shall cut the fore-side of the mast between these limits.
7.2.6 These measurements apply to masts whether fitted with mastjacks or otherwise. At all times when sailing, an extension of the upper surface of the deck shall intersect the mast at the upper edge of the deck limit mark.