The cloth device allows the sail to tack around the furled headsail. ATN makes one called the Tacker, which may be what you have. There should be a
line that attaches to the base of the forestay, to keep the tack of the Gennaker the proper height off the deck.
The maximum wind speed and angle are really dependent on the cut of the sail. I would say that you probably shouldn't use it in more than 14 knots apparent wind, as a rough guess. If the sail has a label from a loft on it, it would be well worth calling the loft and asking them some questions about the sail. Chances are likely they'll have some records of the sail and what specifications it was made for.
__________________
Sailingdog
Telstar 28
New England
You know what the first rule of sailing is? ...Love. You can learn all the math in the 'verse, but you take
a boat to the sea you don't love, she'll shake you off just as sure as the turning of the worlds. Love keeps
her going when she oughta fall down, tells you she's hurting 'fore she keens. Makes her a home.
—Cpt. Mal Reynolds, Serenity (edited)
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