Eileen and I do use a telltail on the spinnaker. It is about 6 to 8 feet from the foot and about 8 to 10 inches back from the luff of the spinnaker. Seems to me that with the new cuts getting flatter you will be sailing a bit higher. The sails are becoming more of a code 0 type of situation than a traditional downwind chute. I think that we will soon be talking of "old school style" of flying spinnakers on catamarans. "Old school" will be folding the luff.

Later,
Dan