Great post in the past on prop/pitch questions. Here is another quick one. A friend of mine is running an older 1890 Lund Pro V (Just had it refurbed, it looks great), and has that coupled with a new Yamaha 115hp 4 stroke. I believe he is running a 13" pitch Alum. prop on it (not sure of dia.). I believe the suggested "high end" rpm's is around the 5000-6000 range and he feels that it is over rev-ing as it is running over 6,000rpm when opened up (about 6300 I would guess). He also gas the same pitch SS prop. From what I can remember last fall the SS had even higher rpm's. That makes sense to me because there would be less flex in the SS, right? If a person is running to high rpm's with a 13" pitch Alum. prop would going to a 15" pitch SS be right or would one have to go even more (17") to get the high end rpm's to be right?
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WaveWacker
Great post in the past on prop/pitch questions. Here is another quick one. A friend of mine is running an older 1890 Lund Pro V (Just had it refurbed, it looks great), and has that coupled with a new Yamaha 115hp 4 stroke. I believe he is running a 13" pitch Alum. prop on it (not sure of dia.). I believe the suggested "high end" rpm's is around the 5000-6000 range and he feels that it is over rev-ing as it is running over 6,000rpm when opened up (about 6300 I would guess). He also gas the same pitch SS prop. From what I can remember last fall the SS had even higher rpm's. That makes sense to me because there would be less flex in the SS, right? If a person is running to high rpm's with a 13" pitch Alum. prop would going to a 15" pitch SS be right or would one have to go even more (17") to get the high end rpm's to be right?
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