A nonfurling jib can be used to act as a staysail, although not as efficiently. The problem is that they don’t have enough shape in them to really do the job, plus they aren’t sheeted in the right place for a reaching staysail. But they can still help. Just be careful during spinnaker sets or when coming out of jibes. If the jib is up and sheeted, you’ll have to sail pretty high to get air between the spinnaker and the jib, making it very likely you’ll wipe out. To prevent that, ease the sheet until the sail luffs, or drop the jib halyard a few feet just as the spinnaker is going up. This allows the top of the jib to twist open. Of course, the sail will also come down a bit, allowing a lot more air between the spinnaker and the jib. Basically, you’re pretending only the bottom half of the jib is there, which still helps balance the boat, allowing you to turn down more efficiently and, once again, allowing more air to get to the spinnaker. You’re basically making the jib disappear for those few key seconds.