D
Donald L. Hendrix
I am considering changing from a two-bladed to a three-bladed prop on my I 28 equipped with the original 13 hp MD7A Volvo diesel. I am having a devil of a time determining the gear ratio and prop dimensions for this boat (I believe the prop dimensions are on the prop but it is in a shop some distance from here). My best guess at these dimensions for my present two-bladed prop and this engine are as follows: 12 X 6 X 3/4" X LH. I believe that the shaft reduction ratio is 1.91:1. The engine maximum rpm (for 13 hp output) I believe to be 2,600 rpm. Can anybody confirm or correct these figures?