Check Wind Speed
Ken,Headsails are changed as a function of wind speed.For most fractional rigs, the headsail is used to set the slot for the mainsail.For most sailors the 150 HS is used in very light winds. Say 2 ot 8 knots. The 150 is for use from 8 to 15 knots and the 110 at winds over 15 kts.As to faster sailing downwind, the 150 will, in a wing on wing setup, provide much more sail area regardless of the wind speed. I have seen in races a Hunter skipper change from a 110 on a point to a 150 for the run just so he could get more canvas on the wing.Hope this helps.Bob Dean