I just sold a used spinnaker (Tiger) and told a friend that I did. He said that if I knew of anyone else that wanted one to talk to him about it. He has one that he no longer uses. It is for a Nacra F-18. I think it is about 6 inches taller than a Tiger.

If you put a Formula 18 spinnaker and pole on any other catamaran you can measure the distance back from the Formula 18 front crossbar to where the sheet attaches and copy those dimensions exactly. In other words just measure where they put there blocks on the hull and put them in the same point on your boat.

Later,
Dan