I have a V24 batBoat in the US. Running a 1.5:1 Bravo outdrive with a labbed 28 4 blade. I am seeing 64mph at 4700 rpm, which seems way off to me. I am not exactly sure on what had been done to the labbed prop as I bought it used. I suppose that most of you use the Volvo outdrive, but if you had any input, I would really appreciate it!