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Contrary to what one might think, sailing downwind is not the fastest, but the slowest sailing angle (excepting of course going closer to the wind than than the boat is designed for, usually around 45° or closer). When on a beam reach, a sloop can exceed the wind speed, but when going downwind the absolute maximum is just a bit slower than the wind (due to drag on the hull). What is often done is to use the main and genoa on opposite sides, sometimes called “Butterfly” or “Wing on Wing”, but if there is a swell running the sails can often fold and flap. One can rig a preventer on the mainsail and use a spinnaker pole on the genoa, but this is a bit of work and can be difficult to handle in sudden inclement conditions. The most common sail to use is a Spinnaker (true downwind light sail) or a gennaker (can be used at higher wind angles) but both of these tend to require constant attention - particularly the spinnaker needs to be actively maintained in order to prevent a broach (where the spinnaker overpowers the rudder and the boat rounds up uncontrollably). The Parasailor is designed to be a docile gennaker which uses feature from air foils to bleed excess energy before it threatens to broach the vessel.
At present I feel almost a bit embarrassed writing this page, since I've been in contact with the friendly folks at ISTEC, which make the Parasailor (particularly Jan) for at least 3 seasons and have specified the exact sail I want, but have never consummated the purchase process. At first it was the boat, as I knew I would be replacing the old Zanshin I with the new Jeanneau 57 which would need a different sail. Then I waited a season and finally, at the time of writing this page in January 2014, I am unsure if I will be here this season or might have to fly back to Europe for an operation.
The Parasailor is a novel approach to keeping a big light downwind sail from overpowering the boat; it has a built-in wing (the company makes paragliders, which use the same technology) which will spill excess energy and thus make the sail more manageable in boisterous conditions. It can be rigged to work either with or without a spinnaker pole and the size that I've specified is one down from the recommend large size for this size boat in order to ensure that it can be used by just myself aboard.
I still enjoy listening to the Grateful Dead and, back in the day, was a bit of a “Deadhead” so the logo on the sail should be self-explanatory.

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