Hi Darryn,

the Mosquito spinnaker like the rest of the sails is smaller than F16 max. at about 14.2 m2. But it is as you say plenty big enough to make the Mossie get up and boogie. From experience the Mossies one up downwind speed, matches anything up to trapeze strength breeze. More competitively than upwind in the same strength.

It could be possible to make it smaller and not lose much speed one up, I would leave the luff length the same and cut foot and leach shorter so that the clew ends up higher, sheeting position would then remain the same, at sidestay makes it easy. Higher foot would also aid visibility, a good thing one up.

Regards Gary.