Trying to decode this prop so I can prop it properly. This is the prop on it, and what iBoats thinks it should be. It’s also got a “-17” on the side as well as the markings of “48-53900-17 15” on the hub. The closest I’ve come to identifying the prop is in the other photo.
I don’t think my boat is propped quite right. It’s a 1968 Gulf Stream hard top at about 19 feet. I’m not sure what it weighs, but my suv says heavy and it’s on a double axle. It’s got a mercruiser 160 inline 6 250 cid. Recommended rpm is <a href="tel:3900-4300">3900-4300</a>. 1.68:1 gear ratio. I operate at <a href="tel:4500-7800">4500-7800</a> feet so may need multiple props. With this unknown prop I can’t get past 4000 wot at 4500 feet altitude. I can get it on plane after a distance and gps shows about 23 mph. I put a probably original to the 13 pitch on and it way over-revved. I mostly am looking for cruise efficiency but may pull a tube now and then. The four blade theory looks cool for efficiency and holeshot. The main problem is I’m not sure if I’m running a 17 or 15 now.
I don’t think my boat is propped quite right. It’s a 1968 Gulf Stream hard top at about 19 feet. I’m not sure what it weighs, but my suv says heavy and it’s on a double axle. It’s got a mercruiser 160 inline 6 250 cid. Recommended rpm is <a href="tel:3900-4300">3900-4300</a>. 1.68:1 gear ratio. I operate at <a href="tel:4500-7800">4500-7800</a> feet so may need multiple props. With this unknown prop I can’t get past 4000 wot at 4500 feet altitude. I can get it on plane after a distance and gps shows about 23 mph. I put a probably original to the 13 pitch on and it way over-revved. I mostly am looking for cruise efficiency but may pull a tube now and then. The four blade theory looks cool for efficiency and holeshot. The main problem is I’m not sure if I’m running a 17 or 15 now.
