I get x-Dimension, I get it when people say their drive shaft is 4" below the bottom of the boat, etc. On singles, its obvious, because it's in the center and you can measure against the bottom of the pad or whatever.

My rather foolish question pertains to twin powered boats. When we are talking about prop height in relation to the bottom of the boat, are we still measuring the relation from the center, or from the hull directly in front of the drive as it pertains to twins.

For example, I have a 91 Powerplay. With the boat on the trailer and the drives level to the relation of the hull, the drive shafts are only an inch or so below the actual bottom of the boat. But everyone says how deep the drives are on these old school hulls, and Im sitting here looking like a dope scratching my head. The drives are several inches below the hull, directly in front of where they are mounted, but when it is the actual bottom, they don't seem bad. Soooooo what gives?

Thanks