The wind is blowing 15 knots and you are sailing an A-class upwind with full depower on the main (you are trapezing in 6 knots of wind on the A-class). Then add a 5 m2 jib which gives you more stuff (you don't need) to drag around. Will this be faster??
Yes, for the simple reason that with a jib you will be concentrating more drive low in the rig. Exactly what you want when you are overpowered.
I'm surprised that you didn't pick up on this yourself.
Wouter
