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#1
posted to rec.boats.building
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Bronze corrosion
About three years ago, I moved my sailboat to a slip in a real marina
for the first time ever. I was surprised to see my shaft zinc go away really fast. Then I noticed the edges of the bronze prop were really rough and brittle. Uh-oh, So, I needed to get her bottom painted anyway so had her hauled, not an easy thing to do around here (no facilities). The bronze prop was a goner so I replaced it with a PerfectPitch plastic prop that I like. However, the bronze shaft strut also looked corroded but was good enough to last awhile. Now, I have a diver check the zinc every 6 weeks. So, I plan to haul her again soon and am thinking of replacing the shaft strut. Today, I dug out the old bronze prop whose blade edges were so depleted of zinc that I could break off chunks of metal and examined it. It was only near the blade edges that it was wasted of zinc except a thin veneer of corrosion all over. The rest of it showed good bronze when I used the dremel tool on it. 3 yrs ago when she was hauled, a small piece actually broke off near the cutless bearing holder lip (not structural) causing me to think it was wasted badly. This experiment makes me not so sure that it is bad. I can only determine this by using the dremel all over the strut when she is hauled. Anybody have any experience with this? Now, I can have a strut made but that will prob take forever, they have to use the old one as a model and cast it. I will not be sailing again till next year, no good. Hmmmm.......I've got a well equipped machine shop, so, maybe I can make a strut. Maybe I can make a strut base from silicon bronze, make a strut body from another piece bolted and brazed to base with a cutless bearing holder brazed to that. Thoughts? |
#2
posted to rec.boats.building
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Bronze corrosion
"Frogwatch" wrote: About three years ago, I moved my sailboat to a slip in a real marina for the first time ever. I was surprised to see my shaft zinc go away really fast. You are in a bad neighborhood. My money says either your neighbors have "hot" (improperly grounded) boats or the marina wiring has problems. Either way, it's either for your neighbors and/or marina to make repairs or find another dock. You probably have to build a case. Yoou need a meter that can detect ground currents. I'd find another dock, if I could. Good luck. Lew |
#3
posted to rec.boats.building
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Bronze corrosion
Lew Hodgett wrote:
"Frogwatch" wrote: About three years ago, I moved my sailboat to a slip in a real marina for the first time ever. I was surprised to see my shaft zinc go away really fast. You are in a bad neighborhood. My money says either your neighbors have "hot" (improperly grounded) boats or the marina wiring has problems. Either way, it's either for your neighbors and/or marina to make repairs or find another dock. You probably have to build a case. Yoou need a meter that can detect ground currents. I'd find another dock, if I could. Good luck. Lew and do it quickly! |
#4
posted to rec.boats.building
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Bronze corrosion
On Wed, 2 Sep 2009 20:04:03 -0700 (PDT), Frogwatch
wrote: About three years ago, I moved my sailboat to a slip in a real marina for the first time ever. I was surprised to see my shaft zinc go away really fast. Then I noticed the edges of the bronze prop were really rough and brittle. Uh-oh, So, I needed to get her bottom painted anyway so had her hauled, not an easy thing to do around here (no facilities). The bronze prop was a goner so I replaced it with a PerfectPitch plastic prop that I like. However, the bronze shaft strut also looked corroded but was good enough to last awhile. Now, I have a diver check the zinc every 6 weeks. So, I plan to haul her again soon and am thinking of replacing the shaft strut. Today, I dug out the old bronze prop whose blade edges were so depleted of zinc that I could break off chunks of metal and examined it. It was only near the blade edges that it was wasted of zinc except a thin veneer of corrosion all over. The rest of it showed good bronze when I used the dremel tool on it. 3 yrs ago when she was hauled, a small piece actually broke off near the cutless bearing holder lip (not structural) causing me to think it was wasted badly. This experiment makes me not so sure that it is bad. I can only determine this by using the dremel all over the strut when she is hauled. Anybody have any experience with this? Now, I can have a strut made but that will prob take forever, they have to use the old one as a model and cast it. I will not be sailing again till next year, no good. Hmmmm.......I've got a well equipped machine shop, so, maybe I can make a strut. Maybe I can make a strut base from silicon bronze, make a strut body from another piece bolted and brazed to base with a cutless bearing holder brazed to that. Thoughts? Don't bother trying to fix your boat until the electrical problem at the dock is fixed. |
#5
posted to rec.boats.building
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Bronze corrosion
On Sep 3, 6:28*am, wrote:
On Wed, 2 Sep 2009 20:04:03 -0700 (PDT), Frogwatch wrote: About three years ago, I moved my sailboat to a slip in a real marina for the first time ever. *I was surprised to see my shaft zinc go away really fast. *Then I noticed the edges of the bronze prop were really rough and brittle. *Uh-oh, *So, I needed to get her bottom painted anyway so had her hauled, not an easy thing to do around here (no facilities). *The bronze prop was a goner so I replaced it with a PerfectPitch plastic prop that I like. *However, the bronze shaft strut also looked corroded but was good enough to last awhile. *Now, I have a diver check the zinc every 6 weeks. So, I plan to haul her again soon and am thinking of replacing the shaft strut. Today, I dug out the old bronze prop whose blade edges were so depleted of zinc that I could break off chunks of metal and examined it. *It was only near the blade edges that it was wasted of zinc except a thin veneer of corrosion all over. *The rest of it showed good bronze when I used the dremel tool on it. 3 yrs ago when she was hauled, a small piece actually broke off near the cutless bearing holder lip (not structural) causing me to think it was wasted badly. *This experiment makes me not so sure that it is bad. *I can only determine this by using the dremel all over the strut when she is hauled. *Anybody have any experience with this? Now, I can have a strut made but that will prob take forever, they have to use the old one as a model and cast it. I will not be sailing again till next year, no good. Hmmmm.......I've got a well equipped machine shop, so, maybe I can make a strut. *Maybe I can make a strut base from silicon bronze, make a strut body from another piece bolted and brazed to base with a cutless bearing holder brazed to that. *Thoughts? Don't bother trying to fix your boat until the electrical problem at the dock is fixed. I will be moving but the boat manufacturer no longer exists (S2) and its subsequent ancestor no longer has parts for 29 yr old boats. So, what do y'all think about my making a shaft strut? |
#6
posted to rec.boats.building
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Bronze corrosion
On Sep 3, 10:15*am, wrote:
On Thu, 3 Sep 2009 07:07:08 -0700 (PDT), Frogwatch wrote: On Sep 3, 6:28*am, wrote: On Wed, 2 Sep 2009 20:04:03 -0700 (PDT), Frogwatch wrote: About three years ago, I moved my sailboat to a slip in a real marina for the first time ever. *I was surprised to see my shaft zinc go away really fast. *Then I noticed the edges of the bronze prop were really rough and brittle. *Uh-oh, *So, I needed to get her bottom painted anyway so had her hauled, not an easy thing to do around here (no facilities). *The bronze prop was a goner so I replaced it with a PerfectPitch plastic prop that I like. *However, the bronze shaft strut also looked corroded but was good enough to last awhile. *Now, I have a diver check the zinc every 6 weeks. So, I plan to haul her again soon and am thinking of replacing the shaft strut. Today, I dug out the old bronze prop whose blade edges were so depleted of zinc that I could break off chunks of metal and examined it. *It was only near the blade edges that it was wasted of zinc except a thin veneer of corrosion all over. *The rest of it showed good bronze when I used the dremel tool on it. 3 yrs ago when she was hauled, a small piece actually broke off near the cutless bearing holder lip (not structural) causing me to think it was wasted badly. *This experiment makes me not so sure that it is bad. *I can only determine this by using the dremel all over the strut when she is hauled. *Anybody have any experience with this? Now, I can have a strut made but that will prob take forever, they have to use the old one as a model and cast it. I will not be sailing again till next year, no good. Hmmmm.......I've got a well equipped machine shop, so, maybe I can make a strut. *Maybe I can make a strut base from silicon bronze, make a strut body from another piece bolted and brazed to base with a cutless bearing holder brazed to that. *Thoughts? Don't bother trying to fix your boat until the electrical problem at the dock is fixed. I will be moving but the boat manufacturer no longer exists (S2) and its subsequent ancestor no longer has parts for 29 yr old boats. *So, what do y'all think about my making a shaft strut? You could probably make one in a machine shop. On the other hand, a lot of boats were broken up for parts after hurricanes in the gulf coast area. You might be able to find a used strut pretty cheaply and save yourself some time and effort. There are boat salvage/parts operations with websites. Yes, a salvage one. Maybe I could even get an off-the-shelf one to work if I make an adapter of G10 to put between the hull and strut to adjust the angle and length. Thanks |
#7
posted to rec.boats.building
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Bronze corrosion
Frogwatch wrote:
I will be moving but the boat manufacturer no longer exists (S2) and its subsequent ancestor no longer has parts for 29 yr old boats. So, what do y'all think about my making a shaft strut? Making a strut is not that big a problem, but you might send an E-mail to Tiara and ask if they can tell you a supplier. They are really often very helpful. Matt Colie (used to own a 7.9) |
#8
posted to rec.boats.building
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Bronze corrosion
wrote in message ... On Thu, 3 Sep 2009 07:07:08 -0700 (PDT), Frogwatch wrote: On Sep 3, 6:28 am, wrote: On Wed, 2 Sep 2009 20:04:03 -0700 (PDT), Frogwatch wrote: About three years ago, I moved my sailboat to a slip in a real marina for the first time ever. I was surprised to see my shaft zinc go away really fast. Then I noticed the edges of the bronze prop were really rough and brittle. Uh-oh, So, I needed to get her bottom painted anyway so had her hauled, not an easy thing to do around here (no facilities). The bronze prop was a goner so I replaced it with a PerfectPitch plastic prop that I like. However, the bronze shaft strut also looked corroded but was good enough to last awhile. Now, I have a diver check the zinc every 6 weeks. So, I plan to haul her again soon and am thinking of replacing the shaft strut. Today, I dug out the old bronze prop whose blade edges were so depleted of zinc that I could break off chunks of metal and examined it. It was only near the blade edges that it was wasted of zinc except a thin veneer of corrosion all over. The rest of it showed good bronze when I used the dremel tool on it. 3 yrs ago when she was hauled, a small piece actually broke off near the cutless bearing holder lip (not structural) causing me to think it was wasted badly. This experiment makes me not so sure that it is bad. I can only determine this by using the dremel all over the strut when she is hauled. Anybody have any experience with this? Now, I can have a strut made but that will prob take forever, they have to use the old one as a model and cast it. I will not be sailing again till next year, no good. Hmmmm.......I've got a well equipped machine shop, so, maybe I can make a strut. Maybe I can make a strut base from silicon bronze, make a strut body from another piece bolted and brazed to base with a cutless bearing holder brazed to that. Thoughts? Don't bother trying to fix your boat until the electrical problem at the dock is fixed. I will be moving but the boat manufacturer no longer exists (S2) and its subsequent ancestor no longer has parts for 29 yr old boats. So, what do y'all think about my making a shaft strut? You could probably make one in a machine shop. On the other hand, a lot of boats were broken up for parts after hurricanes in the gulf coast area. You might be able to find a used strut pretty cheaply and save yourself some time and effort. There are boat salvage/parts operations with websites. Or, you could send the old one to a foundry and have them cast a new one. http://www.franklinnonferrous.com/se...FQO2sgodQlDlMA or a marine machine shop http://www.hhprop.com/machining.html |
#9
posted to rec.boats.building
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Bronze corrosion
wrote in message ... On Thu, 3 Sep 2009 17:01:27 -0400, "mmc" wrote: wrote in message . .. On Thu, 3 Sep 2009 07:07:08 -0700 (PDT), Frogwatch wrote: On Sep 3, 6:28 am, wrote: On Wed, 2 Sep 2009 20:04:03 -0700 (PDT), Frogwatch wrote: About three years ago, I moved my sailboat to a slip in a real marina for the first time ever. I was surprised to see my shaft zinc go away really fast. Then I noticed the edges of the bronze prop were really rough and brittle. Uh-oh, So, I needed to get her bottom painted anyway so had her hauled, not an easy thing to do around here (no facilities). The bronze prop was a goner so I replaced it with a PerfectPitch plastic prop that I like. However, the bronze shaft strut also looked corroded but was good enough to last awhile. Now, I have a diver check the zinc every 6 weeks. So, I plan to haul her again soon and am thinking of replacing the shaft strut. Today, I dug out the old bronze prop whose blade edges were so depleted of zinc that I could break off chunks of metal and examined it. It was only near the blade edges that it was wasted of zinc except a thin veneer of corrosion all over. The rest of it showed good bronze when I used the dremel tool on it. 3 yrs ago when she was hauled, a small piece actually broke off near the cutless bearing holder lip (not structural) causing me to think it was wasted badly. This experiment makes me not so sure that it is bad. I can only determine this by using the dremel all over the strut when she is hauled. Anybody have any experience with this? Now, I can have a strut made but that will prob take forever, they have to use the old one as a model and cast it. I will not be sailing again till next year, no good. Hmmmm.......I've got a well equipped machine shop, so, maybe I can make a strut. Maybe I can make a strut base from silicon bronze, make a strut body from another piece bolted and brazed to base with a cutless bearing holder brazed to that. Thoughts? Don't bother trying to fix your boat until the electrical problem at the dock is fixed. I will be moving but the boat manufacturer no longer exists (S2) and its subsequent ancestor no longer has parts for 29 yr old boats. So, what do y'all think about my making a shaft strut? You could probably make one in a machine shop. On the other hand, a lot of boats were broken up for parts after hurricanes in the gulf coast area. You might be able to find a used strut pretty cheaply and save yourself some time and effort. There are boat salvage/parts operations with websites. Or, you could send the old one to a foundry and have them cast a new one. http://www.franklinnonferrous.com/se...FQO2sgodQlDlMA or a marine machine shop http://www.hhprop.com/machining.html Absolutely! If you can't find a used one, there are some more complicated and expensive alternatives. Right about that, I can't imagine having anything cast and machined would be cheap. |
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