"See MarkP has kept option of carrying bigger kites with his adjustable track on new boat --- or praps smaller if Nessie gets usual bout of wind !"
The idea behind the tracks is that the kite is 3m bigger than the mainsail, 15m bigger than the jib and yet has few means of sail trim, halyard length for luff tension and sheet tension for angle of attack and leach tension.
With the tracks I can pull them back in light winds to flatten the sail and open the leach to point higher for additional speed and in the higher winds put them forward to give a fuller shape and thus go lower but not slower.
The idea of procuring a wardrobe of kites for different conditions had never occurred to me. However, I think I would just end up wallet less with three times the amount of Kite repair tape in the sail box.