I am almost finished with my TheMightyHobie18 project. I have a '82 18 magnum that is now converted to a SX w/spi. Running 18SE jib, Tiger main and Tiger spin w/snuffer. 18SE jib is larger than SX, Tiger main is of comparable size to SX and spin is smaller than SX. US Sailing portsmouth lists a DPN of 71.3 for Hobie SX-18 spi. I can't see why my boat wouldn't fall under that portsmouth number for racing. Am I right or wrong? Would there be an advantage for using a different number with penalties? The boat is all Hobie, just different parts from different boats. What do you guys think, I will most likely race it the second weekend in August.