I have almost no issue with the numbers Jake has laid out but, I'd want clarification regarding the main. I suspect the TheMightyHobie18 main is smaller than the Tiger main, if that's the case the big main hit needs to be used.
Using DPN numbers (not wind correctors)
Hobie 18 = 71.4
Spin hit = .96
main hit = .98 (big main hit)
Mast hit = .995
DPN = 71.4*.96*.98*.995 = 66.84
Just to make it crystal clear this configuration cannot be used at an Alter Cup Area qualifier.
That's my position on Windy's request for what it's worth.
One more thing... in light air this frankenboat is going to be a rocket especially if singlehanded!
As a comparison-
H18Thang (no spin) has a Texel rating of 107 and is shared with P18-2 with DPN of 69.1. Add a spinnaker: 69.1 * .96 = 66.34.
H18Thang w/ spin has Texel of 102, same as F16 2 up w/ spin- DPN 65.2.
So the 66.84 is quite close to extrapolated range of 66.34 - 65.2.
Since you are starting with a stock boat with known DPN, there shouldn't be any debate over using the standard modifiers.
