This sail and craft also works very well for it's application.




Just trying to give good advice based on what I know from spending time and building sails in the Tornado class. US$700 is a lot better than the US$1800 a new one costs and if it works well, perfect..
If you want to check out what I am talking about, try laying a mainsail cut for an alu mast over one cut for a carbon mast. There should be less luff curve in the one for the carbon mast. When you hoist a sail with not enough luff curve, the sail becomes flatter than optimum.
A 70s boat will probably be set up for sideways mast bend instead of pre-bend. You will need to adjust your spreaders and inspect the tangs+spreaders for the increased loads.