There are a few Utube clips about twizzle sails. They are basically two headsails goose-winged but instead of a couple of spinnaker poles holding them out, they are attached by poles to each other. They appear to be more stable downwind than poled out headsails.
I had never heard of them either until about 5 years ago when an English sailor, John from a boat called "Hoorah" gave a talk in Marmaris about sailing 3 oceans in 3 years. He used a Twizzle sail for the entire ocean crossings he did. ( Guernsey to Brazil, to Cape Town to Perth to Sri Lanka, back to Cape Town, then Brazil and home to Guernsey. )
John's boat was a Hallberg Rassy, 42 I think, and his talk centred on timing ocean crossings well ( Follow Jimmy Cornell's recommendations) and using the Twizzle for comfort and safety. The boat stays more upright using this style of rig.
I'm also interested in seeing the Elvstrom sail operational, particularly in larger ocean swells. I'm not sure how it would work compared to goose-winging 2 headsails or the twizzle sail. Your post has gt me thinking.
Craig
"Shirley Valentine"
Gold Coast
Australia