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Commander
- Joined
- Aug 23, 2001
- Messages
- 2,591
Alright, time for some more prop talk.
I have been hittin the internet looking for a “test prop” that wont break the bank and have come up with nothing. Then it dawned on me that I have a test prop sitting in the back room.
This is my Johnson (I love saying that)
Now this is my Johnson, bronze "speed prop". I am not a big fan of it because its a Right hand prop and my boat likes Left’s. This prop will go like a bat out of hell but at the same time it will lock the steering at WOT. So its not anything I want to use on a daily basis. The prop 15X19R with some aggressive cupping so I figure it closer to a 21P. I ran it yesterday thinking it would have a better bite on the water being it has a larger hub then my newly reworked 14X24L Ellison that has 21+% slippage that I normally use. The Ellison also has me around 5000rpm’s @ WOT. To high and to inefficient.
The Ellison.
Back to the test.
First I installed it like it should be (everything was adjusted on the drive for a right hand prop so the boat would drive semi straight) and then I run the Johnson prop. This is what I came up with.
The boat loves to hate this prop. Even with everything adjusted the steering still pulls and hard at WOT. More bow lift at take off and all the way up until it gets on plain. That’s a plus, the Ellison had a semi flat take off (lots of slip and I really noticed how bad towing someone in last weekend).
On a plain it’s a different story. The prop “rolls out” but you can tell that the pitch is to low. That’s how I found out that my rev limiter is set closer to 5500 then 5000. It doesn’t seem to bite as had as the Ellison (maybe because of the pitch again). Trim is useless. I mean it has to be all the way down to maybe a 1second tap of the trim pump, up. Any more then that and you could feel it break loose. When I would go higher in the rpm ban I could add just a tiny more but nothing like the Ellison.
With the Elision I can almost power slide (like in a car) around hard corners. With the Johnson I can about circle a channel marker within a couple feet at 30mph.but of course the trim is already down because of the prop needing it to be from the start.
So I figure I can turn a 15X21, 5200+rpm’s @ WOT and I need more bite on a plain. What would use? Remember I am on a budget and Volvo Penta, high pitch props are hard to come by.
I have been hittin the internet looking for a “test prop” that wont break the bank and have come up with nothing. Then it dawned on me that I have a test prop sitting in the back room.
This is my Johnson (I love saying that)
Now this is my Johnson, bronze "speed prop". I am not a big fan of it because its a Right hand prop and my boat likes Left’s. This prop will go like a bat out of hell but at the same time it will lock the steering at WOT. So its not anything I want to use on a daily basis. The prop 15X19R with some aggressive cupping so I figure it closer to a 21P. I ran it yesterday thinking it would have a better bite on the water being it has a larger hub then my newly reworked 14X24L Ellison that has 21+% slippage that I normally use. The Ellison also has me around 5000rpm’s @ WOT. To high and to inefficient.
The Ellison.
Back to the test.
First I installed it like it should be (everything was adjusted on the drive for a right hand prop so the boat would drive semi straight) and then I run the Johnson prop. This is what I came up with.
The boat loves to hate this prop. Even with everything adjusted the steering still pulls and hard at WOT. More bow lift at take off and all the way up until it gets on plain. That’s a plus, the Ellison had a semi flat take off (lots of slip and I really noticed how bad towing someone in last weekend).
On a plain it’s a different story. The prop “rolls out” but you can tell that the pitch is to low. That’s how I found out that my rev limiter is set closer to 5500 then 5000. It doesn’t seem to bite as had as the Ellison (maybe because of the pitch again). Trim is useless. I mean it has to be all the way down to maybe a 1second tap of the trim pump, up. Any more then that and you could feel it break loose. When I would go higher in the rpm ban I could add just a tiny more but nothing like the Ellison.
With the Elision I can almost power slide (like in a car) around hard corners. With the Johnson I can about circle a channel marker within a couple feet at 30mph.but of course the trim is already down because of the prop needing it to be from the start.
So I figure I can turn a 15X21, 5200+rpm’s @ WOT and I need more bite on a plain. What would use? Remember I am on a budget and Volvo Penta, high pitch props are hard to come by.