I have been going back and forth between Maxiprop and Autoprop. I guess what I am looking for are some stories where Autoprops have not worked out or have not met expectations. Good Winds Dave
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Guest
Maxiprop for me
Going on three years now. Check the Archives for "prop" to read gobs about this debate.
Going on three years now. Check the Archives for "prop" to read gobs about this debate.
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Bob Kovich
Autoprops are fine
I have had an Autoprop for three seasons with nothing but excellent results. Only problem is remembering to change out the zinc before the new season.
I have had an Autoprop for three seasons with nothing but excellent results. Only problem is remembering to change out the zinc before the new season.
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Bill Andrews
AUTO PROP
Just got back from the Miami boat show and talked with Yanmar people. I asked them about buying a new prop and their response was for a Yanmar engine they recommended a fixed prop, but if I was going to buy a folding prop NOT TO BUY an Auto Prop!!! It was not good for the Yanmar engine.
Just got back from the Miami boat show and talked with Yanmar people. I asked them about buying a new prop and their response was for a Yanmar engine they recommended a fixed prop, but if I was going to buy a folding prop NOT TO BUY an Auto Prop!!! It was not good for the Yanmar engine.
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Tom
Bill why did he say that?
What was his rational?....Is there anything to back that up?...Who was he, a mechanic or a Yanmar Factory rep?...I the past I have talked to nationwide Yanmar Experts Mack Boring in Union NJ about the prop and I never heard that commment....Actually I have heard JUST THE OPPOSITE!.....The Autoprop is one on the only props that is self pitching which helps keep optimum load on the engine which is GOOD for a diesel. In fact many quality manufacturers put the Autoprop on their high end boats like Hylas Offshore Yachts...www.hylasyachtsusa.com
What was his rational?....Is there anything to back that up?...Who was he, a mechanic or a Yanmar Factory rep?...I the past I have talked to nationwide Yanmar Experts Mack Boring in Union NJ about the prop and I never heard that commment....Actually I have heard JUST THE OPPOSITE!.....The Autoprop is one on the only props that is self pitching which helps keep optimum load on the engine which is GOOD for a diesel. In fact many quality manufacturers put the Autoprop on their high end boats like Hylas Offshore Yachts...www.hylasyachtsusa.com
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Stanley J. Rogacevicz
RPM/Torque Maybe ?
Tom, I have not heard this before either and I have a new AutoProp on a new SS shaft sitting in my cellar ready to go on my Yanmar powered c320 before spring. My only guess with my limited knowledge would be that from what I have seem the Yanmars are more rev-ers than luggers in the diesel world. So maybe the higher rpm power curve doesn't fit the AutoProps way of thinking and it litteraly bites off more than the Yanmar was designed to chew at low rpm. There are Yanmar c320'ers out there singing the Autoprop praises with #'s to back it up so I'm not worried at all. Stan "Christy Leigh" c320 #656
Tom, I have not heard this before either and I have a new AutoProp on a new SS shaft sitting in my cellar ready to go on my Yanmar powered c320 before spring. My only guess with my limited knowledge would be that from what I have seem the Yanmars are more rev-ers than luggers in the diesel world. So maybe the higher rpm power curve doesn't fit the AutoProps way of thinking and it litteraly bites off more than the Yanmar was designed to chew at low rpm. There are Yanmar c320'ers out there singing the Autoprop praises with #'s to back it up so I'm not worried at all. Stan "Christy Leigh" c320 #656
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Mike
Autoprop
In response to Bill Andrews comments on Yanmar, I too, ask why a Yanmar Rep would say that. I have been in contact with Yanmar Europe, and they assure me that "hundreds of Autoprops" have been succesfully installed on their engines. The gentleman I spoke with said he had never heard of any problems with Yanmar engines that could be specifically related to any TYPE of propeller. Rather, it was poorly pitched or sized propellers that result in typical engine problems. Yanmar does not approve or dissaprove of propellers on a by-brand basis. Sounds to me like maybe the gent at the Miami show had something personal against Autoprop. Anyone who would go out of their way to trash a brand, as a supposed professional commenting on a nuetral topic, is suspect in my mind. To add my own note, I have used an Autoprop on a Nonsuch now for 3 years, and it has performed flawlessly. My engine is a refitted Yanmar 3 cylinder.
In response to Bill Andrews comments on Yanmar, I too, ask why a Yanmar Rep would say that. I have been in contact with Yanmar Europe, and they assure me that "hundreds of Autoprops" have been succesfully installed on their engines. The gentleman I spoke with said he had never heard of any problems with Yanmar engines that could be specifically related to any TYPE of propeller. Rather, it was poorly pitched or sized propellers that result in typical engine problems. Yanmar does not approve or dissaprove of propellers on a by-brand basis. Sounds to me like maybe the gent at the Miami show had something personal against Autoprop. Anyone who would go out of their way to trash a brand, as a supposed professional commenting on a nuetral topic, is suspect in my mind. To add my own note, I have used an Autoprop on a Nonsuch now for 3 years, and it has performed flawlessly. My engine is a refitted Yanmar 3 cylinder.
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Bryce
auto prop
I concur with all the positive responses for auto prop. My 410 has the 50 HP yanmar and I'm on my 4th season with the prop. I polish it yearly and replace the anode twice a season. I run the yanny at around 3000 rpm's when motoring and it loves it. fuel efficiency went up and speed at a given rpm has increased. the only caution I've got is when switching from forward to reverse or vica versa, I need to give the shaft a little more time to stop turning or I get a loud thunk from the transmission when switching gears. My guess is the autoprop has a lot more mass than the standard two blade and takes longer to stop. Bryce S/V Spellbinder H410
I concur with all the positive responses for auto prop. My 410 has the 50 HP yanmar and I'm on my 4th season with the prop. I polish it yearly and replace the anode twice a season. I run the yanny at around 3000 rpm's when motoring and it loves it. fuel efficiency went up and speed at a given rpm has increased. the only caution I've got is when switching from forward to reverse or vica versa, I need to give the shaft a little more time to stop turning or I get a loud thunk from the transmission when switching gears. My guess is the autoprop has a lot more mass than the standard two blade and takes longer to stop. Bryce S/V Spellbinder H410
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Phil
Autoprop "Thunk"
Bryce, I agree with your comments, Bryce. My Autoprop has given me 3 plus years of excellent performance on my Catalina 42MKII. I had the same problem with the "thunk" when engaging my engine. I spoke with an Autoprop rep at the Atlantic City boatshow, and he commented on that phenom. There are no hard stops to the unit, so where does the noise come from? He related that it is indeed more mass on the Autoprop than on standard props, and more weight as well. The clunk comes from inertia along the shaft when engaged. He stated that lowering your idle sometimes diminishes or alleviates that clunk. I spoke with Joe Joyce from Westerbeke, and he said that alot of specialty props do that, but it shouldn't hurt the transmission at all, as the transmission should be able to handle alot more than the low end torque created at engagement. My idle sits at 800 or so, so I'll lower it if the engine is happy. Try the same.
Bryce, I agree with your comments, Bryce. My Autoprop has given me 3 plus years of excellent performance on my Catalina 42MKII. I had the same problem with the "thunk" when engaging my engine. I spoke with an Autoprop rep at the Atlantic City boatshow, and he commented on that phenom. There are no hard stops to the unit, so where does the noise come from? He related that it is indeed more mass on the Autoprop than on standard props, and more weight as well. The clunk comes from inertia along the shaft when engaged. He stated that lowering your idle sometimes diminishes or alleviates that clunk. I spoke with Joe Joyce from Westerbeke, and he said that alot of specialty props do that, but it shouldn't hurt the transmission at all, as the transmission should be able to handle alot more than the low end torque created at engagement. My idle sits at 800 or so, so I'll lower it if the engine is happy. Try the same.
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Bryce
thunk
Phil thanks. I'll look at the idle speed when we get wet next month, but memory (if I'm not having a senior moment) say my yanny is idling around 800 rpm. I'll try lowering it and see if it still runs. Bryce S/V Spellbinder H410 Just as an aside, I came across an PS article from Jan. 1995. They had MIT test 9 props. the first paragraph in the conclusion reads "No one prop comes out on top in every category-you just can't have it all! The only one that comes close is the self-pitching Autoprop". I'd be happy to fax the article if anyone is interested. E-mail me a fax number. I'm in the directory.
Phil thanks. I'll look at the idle speed when we get wet next month, but memory (if I'm not having a senior moment) say my yanny is idling around 800 rpm. I'll try lowering it and see if it still runs. Bryce S/V Spellbinder H410 Just as an aside, I came across an PS article from Jan. 1995. They had MIT test 9 props. the first paragraph in the conclusion reads "No one prop comes out on top in every category-you just can't have it all! The only one that comes close is the self-pitching Autoprop". I'd be happy to fax the article if anyone is interested. E-mail me a fax number. I'm in the directory.
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