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Looking for prop explanation, not just answer
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<blockquote data-quote="wmk0002" data-source="post: 424247" data-attributes="member: 13975"><p>I have 2016 1648 NCS flat bottom with a 1992 15 hp Johnson. I run about 20 mph with a light load and 2 guys at 6250 rpms with an old factory 10" pitch prop. Slip calculates out close to yours. With the same load and a newer factory 8" prop it runs 6800 rpms and does about 18-19 mph depending on load distribution. Prop slip on that one is closer to 11%. IMO both props have good enough holeshot. The boats draft so shallow, it doesn't take much to get on plane.</p><p></p><p>Right now, I like the 10" prop as I feel I get better mpg's. I run either prop wide open unless I am idling using my sonar so the lower rpms seem to help.</p><p></p><p>Lower prop slip is always better but, for my hull at least, in order to achieve it it requires a smaller pitch prop which still drops top speed despite being slightly more efficient. I'm sure it gets better as you go up closer to the max hull rating of 35hp.</p></blockquote><p></p>
[QUOTE="wmk0002, post: 424247, member: 13975"] I have 2016 1648 NCS flat bottom with a 1992 15 hp Johnson. I run about 20 mph with a light load and 2 guys at 6250 rpms with an old factory 10" pitch prop. Slip calculates out close to yours. With the same load and a newer factory 8" prop it runs 6800 rpms and does about 18-19 mph depending on load distribution. Prop slip on that one is closer to 11%. IMO both props have good enough holeshot. The boats draft so shallow, it doesn't take much to get on plane. Right now, I like the 10" prop as I feel I get better mpg's. I run either prop wide open unless I am idling using my sonar so the lower rpms seem to help. Lower prop slip is always better but, for my hull at least, in order to achieve it it requires a smaller pitch prop which still drops top speed despite being slightly more efficient. I'm sure it gets better as you go up closer to the max hull rating of 35hp. [/QUOTE]
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