[Lucky Dog 33]

Recently picked up a 3300 Open with twin original Crusader 454s. The props that came with the boat are 17x20 3 blades. The boat can’t get out of its own way at a reasonable cruise of 3200-3400rpm. At 3200, the boat barely gets 16kts and even with full trim the bow is in the air.

Tiara sent me the original performance sheet for this set up, 350hp 454s with 1.88:1 transmissions and 18x21 3 blade props. At 3000rpm the boat should do 26mph. Granted, this is not a brand new boat and original notes, so I know that is not realistic, but 16kts????

A local mechanic, as well as prop shop told me I should run 19x19 3 blades, which should get me to about 20kts at 3000-3200. This sounds more like what the boat should run. My concern is the distance from the prop blade to the hull. 

Has/is anyone running 19” props on a 3300? Or does anyone know the distance from the shaft to the hull at the props? 

Thanks in advance. I plan to order props and have everything on hand before I get a short haul.