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The UPS does not need to be doused. It rolls up on its own furler, which is basically a reinforced seam sewn into the edge of the sail. I got a price quote last year, but don't remember the actual figures. I think it may have been around $1,500, which also included the Harken roller furler mechanism and tackle. However, my quote was about $500 higher than usual because I wanted the whole sail to feature a large custom graphic of our boat's logo. Note: The UPS doesn't require a roller furler. It can be doused with a sleeve. However, the beauty of its design is that it can be furled. This is the only way I can fathom being able to run a spinnaker single handed. I had a spinnaker on my last sailboat - never used it because of the hassle.
Because of the "no" backstay issue, Doyle recommended that the sail be connected to the mast just above the jib/forestay. To reinforce the mast, I upgraded the capacity of my shrouds by replacing them with thicker cable. The only consideration of where to attach the top of the UPS is that there must be enough room between the UPS and the jib/forestay for the UPS to clear when it is being rolled. Due to the high volume shape of the UPS at the top, the top of the sail does not wind up as tight at as the bottom.
Doyle recommend the roller furler mechanism to be slightly above the pulpit. However, I designed a special bowsprit lever to enable it to be attached in front of the pulpit. You can see it on the first page of my 2023 modifications website:
http://www.icesculptureworld.com/santana2023c/page1.html
In either case, I have not yet purchased the UPS, so I can't speak from experience.
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