The boat is not complex to optimise and good all-round settings have been proven over many seasons now. With a standard and uniform sail this is perhaps easier than with many classes. Even though we have 2 mast options (alloy M7 and Blaze carbon) the basic rig set-up is common to both.
Rake - This is measured with a long tape attached to the halyard and raised to the sheave at the top of the mast. The measurement itself is then to the UNDERSIDE of the hull at the transom one side or other of the rudder post. Aim for 7040mm (7 metres and 4 centimetres).
Mast Position From the bow forestay fitting to the front of the mast tube (NOT the mast step). 1045mm (1 metre and 4.5 centimetres). Should be set up already but do check it out.
Spreaders This can depend on crew weight .... talk with somebody who is similar in weight to you if possible. As a rough default for the M7 .... the outboard end of the spreader bracket has two holes - use the forward one. The inboard adjustment range is over four holes - go one back from the front. M7 spreader length is normally 360mm - some lightweights have shortened them to as little as 280mm and report some benefit - What is light ? Well lets assume under 70kg ... Carbon masts ... talk with Cirrus or look at local masts/crews as some like more deflection than others as it suits the way they sail the boat - generally though if you are heavier tend towards less deflection and vice versa.
Lowers These provide a limit to the amount of bend in the bottom part of the mast when loaded up. Again as a 'default' set so that (without sail on the mast) with finger and thumb you can move the spreader wire 50-60mm left to right at mid-point. Have them too tight at your peril ! It will 'work' but will make life a tad difficult handling wise with absolutely no gain.... overdo it further and have them bar tight (cos somebody said it was a "good idea" ... they do) with the shrouds a tad loose and you could be saying 'bye bye' to the mast when going deep down wind in gusty high wind conditons - it can encourage 'mast inversion'. If really windy consider loosening a bit from 'default'.
Carbon v Alloy Unusually the carbon mast was developed AFTER the standard sail was in production for the M7 alloy masts (we wanted to keep the sail totally one design and standard). This is unusual but it does mean the basic static set-up for both spars is very similar. There are subtle differences in how you might apply mainsheet, kicker and cunningham controls to get the best out of each but our advice is NOT to move the core standing rigging settings.
Blaze Fire settings Identical to the Blaze and the sails can be swapped out either way without changing default settings
Blaze Halo settings You do have to rake the mast more vertically so that the boom is almost horezontal under mainsheet load - on the latest masts/sails this means you adjust the standing rigging on the adjusters from one end of the possible range to the other. Only takes 5 minutes without having to 'drop' the mast and away you go ..... More on this Halo sail set-up will be available shortly !
(Page in development - more soon !) 15-1-16