As a new owner of a volvo DP-C outdrive, I'm trying to understand the sizing of props and pitches as I already understand in reference to OMC/Merc sizing (ie: 14x19, that's simple to grasp). Volvo have A4,5,etc, B4,5,etc, etc, etc..... Personally, I have a set of B4 aluminum props on my DP-C...