Yeah, definitely take the jib!
I went out a while ago with the girlfriend. I'd only had the boat a couple of weeks and as she isn't very clued-up at all when it comes to sailing (nor was/am I), I thought I'll just leave the jib in the centre and not worry about sheeting it in from side to side. = Fail.
That day, I learned 2 things:
#1 - What it means to be "In irons".
and #2: How short my temper can be when I get frustrated due to lack of knowledge.
By the time I managed to finish the tack (we're talking a good 5-10 minutes in irons, here) the boat was pretty-much for sale, my girlfriend and I were through and I was never gonna try sailing again! That passed in seconds once I got moving again, but it was a lesson well learned.
Without having the jib to backfill/backwind, a successful tack is near impossible!
Not long after that, the wind picked up to a gusty 20 knots and I learned all about my comfort zone. These things are quite the handful when the wind gets into their sails and even with the main and jib sheeted right out, I was still struggling to keep my pulse and the boat speed to a manageable rate. My girl only weighs about 50kg and I'm about 80, so the inclination for the boat to get a lean on was pretty strong. Then as we headed downwind back to shore, we were riding in on the white-caps and rollers with the leeward bow-tip going a few inches under water occasionally, and me with images of slow-motion pitch-poles and capsizing running through my head!!!
Overall, a grand day out!!!
