I have a 2000 Model Glastron SX175 with Volvo 3.0L/SX Drive which I believe is 1:1.97 ratio. Currently have a decent shape aluminum 3-blade 14.5x19p volvo penta prop that has open vent holes in it (one for each blade). The best numbers I've ever seen at a light load were 38mph (GPS) @ 4600...
