Boats with longer waterlines for their length will be faster. Hulls with fair lines without rule induced bumps will be faster. Lighter will be faster. Narrow waterline beam boats are faster.
Long and lean will beat short and fat any day.
Would you mind mentioning a boat or three that pop into your mind in the 28 - 33' or so size.
Long waterline for lengh:
Rule induced bumps:
Narrower vs. fatter.
I know you have been doing this a long time and I would like to look up some specific boats and see the difference.
It seemed to me that the Catalina 27 is a little better hull shape than the Catalina 30 according to this criteria, yes?