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A Sting is a catamaran that was built from a Dart 15 but it has the following differences.
The mast is about 0.6 metres taller and is much heavier section (based on Dart 18 section). The Mainsail is a radial cut and a full panel bigger (I would guess 1sq metre bigger) than the Dart 15. It is quite good to sail with a trapeze - especially for the heavyweights (13 stone). It never really took off in big numbers. They might have sold about 50 in total and most went on the continent. A big issue is that they are very hard to right from a capsize single handed due to the heavy mast and rig. I know sailors that sold them for this reason - as sailing them single handed without rescue can be dangerous. There are so few around that you would just end up racing in handicap racing and not knowing how well you are sailing. You are much better getting a Dart 15 and sailing in one class racing. The resale value of a Dart 15 is also much better.