I have a ranger phantom with a '05 Yamaha 2 stroke 70 and an unknown 4 blade so prop on it. The only markings on it are "Culpepper". I bought the boat used and the seller didn't know much about the prop I'm looking to get a spare prop for emergencys but I have no idea what pitch and diameter the current prop is. I'm getting 32-34 mph @ 5400 rpm currently. I'm just looking for a cheap aluminum 3 blade for a spare but have no idea what pitch and diameter it should be. I appreciate any help.