[jclark003]

Maybe you mean 2325 on the WOT? +2500 would really be spinning those engines.

The 52 has very long shafts and tend to get shaft whip in certain conditions and certain rpm ranges. For the most part I get almost no vibrations once I get over 1600. Below that and the hull gets inefficient causing the engines to work hard and put a load on the shafts. Thats pretty much the only time I get shaft whip/vibrations.

I am running 32X38 with the lightest trim strips on the props. WOT is 2320 at near full fuel load. I cruise around 1800 and at half fuel I usually see about 27 mph @48 GPH ( about .56 MPG). I want to say at 1900 I am around 29 MPH and about .52 MPG. Backing down to 1700 gets me to about .58-.6 MPG but the boat starts to feel heavy. I run in fresh water so I suspect I would pick up performance in salt water.


I very much like that the engine loading/ fuel burn numbers are below what Cat recommends until about 2000 and above.

Hope this helps.