Hobie 18 rates 109 TEXEL (DPN 71.4) Same as Nacra 5.7 (DPN 72.6).
Add a spin and you get 104

Hobie 18 with F18 rig, no spin rates 107. Same as Nacra 570 (DPN 70.5) and Prindle 18-2 (DPN 69.1)
Add a spin and you have 102.

F18= 106/101
F16= 106/102 ( 2 up)

Crossing over to Portsmouth will give you a range as a starting point.

Race cheap, race faster, Damnit!

E-Scow
24' ULDB

18HT hulls plus Gcat 5.7 rig = 18GT!