2014 © Graham Rabbitts [You are welcome to use original material from this site, but the source should be acknowledged]
Our first effort was a heavy weather jib, probably a bit bigger than a real storm jib. It was built to go no higher than the second reef, and to clear the forward lowers. It was set with hanks on the inner forestay and could live in a ‘body bag’ on deck, with the tack secured and all the the hanks held on a wire loop so the sail cannot blow away. It is shown set on the right in 35kts of wind, sheeted via a strop to the main track. This works surprisingly well, and the boat goes well to windward in very strong winds. But this rig lacks power below 23kts of apparent wind.
So in 2007, we bit the bullet and got John Channon to make a staysail that filled the triangle formed by the inner forestay. After a bit of experimentation, this sail worked well, giving good performance in flat water down to 15kts of apparent wind (but lacking drive to punch through a sea until the wind freshened). With this rig the boat heels less, makes less leeway, and is generally more docile, feeling a lot less pressed in the gusts. It is probably faster than the genoa in winds over 18kts in terms of VMG (in flat water).
The trysail can be stowed on deck, with slides already in their own dedicated track. Installation details are on the heavy weather downwind page. If beating, (or in winds og gale force or more) the tack would be taken down to gooseneck level and the sail would be sheeted via a snatch block on the toerail.