Which sail with 8.5 and Ultrasonic ?

[Naturel]

hello,

I have no experience with very big sail and i want a new sail with my Ultrasonic
Actually my biggest sail is Overdrive 8.5.
So I don't know what to choose between an Overdrive 9.7m or an Overdrive 11m !
9.7 may be too small
11m maybe too big

Help, I am lost !

Thank you for any advices .

My weight is 79kg.

[Roger]

Naturel,
Get the Ultrasonic...... put your 8.5 Overdrive on it (rigged full).
THEN decide if you want/need a bigger sail.
I've sailed the US 147 with 9.1 Sailworks NX fw and 8.5 Sailworks NX 4 and found that I can
get fully on plane in < 10 knots. I weigh 77 KG.
Can't stay on plane in lulls < 8 knots with the 8.5 m2 NX4, but can on the 9.1m2.
You may find you don't need > 9.5- 10.0 m2.
It is hard to find sails with good low end in > 9.5 m2 as most sails that big are designed for high wind
formula racing.
The Overdrive is better as it's more Jr/Youth medium wind oriented.
Roger

[Remi]

Hi Naturel

I suppose you see already the Video of Steve Alen on the UltraSonic 147 with 9.7 Overdrive, can beat easy a Formula with 11 on reach in very light winds and get better and better when the wind pick up. For a 80 kgs rider is the best combination from 7 to 15 knots after with your 8.5 you can use it until 20/25 knots depend of your skill.
Have fun
All the best