I am trying to find most accurate name for the topsail we have on our 111 year old classic racing cutter, Thelma. (She is not a replacement for Taleisin who we cruise during the Northern Hempisphere Summers but the lady we have repaired and upgraded over the past two winters here in New Zealand.) The topsail is set on its own topmast and has a spar on its outer, lower edge which helps get extra area out beyond the main gaff. (yes it is tricky to set but we are getting the hang of it.) The only book that mentions a name for this sail is Don Streets, The Sailing Yacht. He calls it a double jackyard topsail. I need confirmation of this if anyone can help.
You can see pictures of Thelma on our webpages at www.landlpardey.com