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Best prop for 1976 Johnson 15 top end speed?
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<blockquote data-quote="wmk0002" data-source="post: 464447" data-attributes="member: 13975"><p>I have a 95 model 15Hp that is also rated at 7000 rpms. I run a 3 balde 8" pitch aluminum prop at about 6900 rpms when solo and have never had any problems. It is noisy but it pushes my 1648 near 20mph and has great holeshot. I was going through the trouble of putting on a 10" prop for when I was solo and saving the 8" for a load and with another passenger but I've since quit wasting time. The 10" would only run 1 mph faster (maybe 2 on glass water) and the rpms only dropped to 6500 so didn't really save on gas or anything either.</p><p></p><p>To the OP, your rpms seem low unless you are in a heavy boat. I have an 82 9.9hp that will run about those same numbers with a 10" prop. Just swapping to the 15hp carb only got me 300-400 more rpms. Also have a 82 true 15hp and it will run about 6200 rpms with the factory 10" prop on the same hull and load.</p></blockquote><p></p>
[QUOTE="wmk0002, post: 464447, member: 13975"] I have a 95 model 15Hp that is also rated at 7000 rpms. I run a 3 balde 8" pitch aluminum prop at about 6900 rpms when solo and have never had any problems. It is noisy but it pushes my 1648 near 20mph and has great holeshot. I was going through the trouble of putting on a 10" prop for when I was solo and saving the 8" for a load and with another passenger but I've since quit wasting time. The 10" would only run 1 mph faster (maybe 2 on glass water) and the rpms only dropped to 6500 so didn't really save on gas or anything either. To the OP, your rpms seem low unless you are in a heavy boat. I have an 82 9.9hp that will run about those same numbers with a 10" prop. Just swapping to the 15hp carb only got me 300-400 more rpms. Also have a 82 true 15hp and it will run about 6200 rpms with the factory 10" prop on the same hull and load. [/QUOTE]
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Best prop for 1976 Johnson 15 top end speed?
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