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#1
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Which feathering prop?
I am headed for Annapolis Thursday at o'dark thirty. One priority is to
find a 3 bladed feathering prop. The candidates a Martec Auto Stream , MaxProp, VariProp and Gori. Anyone have anything good or bad to say about any of them? Any others you would recommend I look at? -- Glenn Ashmore I'm building a 45' cutter in strip/composite. Watch my progress (or lack there of) at: http://www.rutuonline.com Shameless Commercial Division: http://www.spade-anchor-us.com |
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#2
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Which feathering prop?
In npj0f.64$784.63@lakeread08 "Glenn Ashmore" writes:
I am headed for Annapolis Thursday at o'dark thirty. One priority is to find a 3 bladed feathering prop. The candidates a Martec Auto Stream , MaxProp, VariProp and Gori. Anyone have anything good or bad to say about any of them? Any others you would recommend I look at? Any reason Autoprop is not on your list? Price? I had a two bladed Gori, and think this is perhaps the best two bladed folding prop. But when I wanted to change to a three bladed feathering prop, I ended up with j-prop: http://www.bomon.com/jprop/. I have been very happy with the performance and here in Europe it is much cheaper than the competition. There is one question you should pay attention to: If your gearbox has not about the same reduction ratio of revs on both the forward and backwards gear, then you better to get an feathering prop that can be adjusted to different angle of attack of the blades on forward and reverse. I know J-prop does not have this, but only a few have. It is possible maxprop has. - Lauri Tarkkonen -- Glenn Ashmore I'm building a 45' cutter in strip/composite. Watch my progress (or lack there of) at: http://www.rutuonline.com Shameless Commercial Division: http://www.spade-anchor-us.com |
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#3
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Which feathering prop?
Luke!
"Glenn Ashmore" wrote in message news:npj0f.64$784.63@lakeread08... I am headed for Annapolis Thursday at o'dark thirty. One priority is to find a 3 bladed feathering prop. The candidates a Martec Auto Stream , MaxProp, VariProp and Gori. Anyone have anything good or bad to say about any of them? Any others you would recommend I look at? -- Glenn Ashmore I'm building a 45' cutter in strip/composite. Watch my progress (or lack there of) at: http://www.rutuonline.com Shameless Commercial Division: http://www.spade-anchor-us.com |
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#4
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Which feathering prop?
On Mon, 3 Oct 2005 19:46:37 -0400, "Glenn Ashmore"
wrote: I am headed for Annapolis Thursday at o'dark thirty. One priority is to find a 3 bladed feathering prop. The candidates a Martec Auto Stream , MaxProp, VariProp and Gori. Anyone have anything good or bad to say about any of them? Any others you would recommend I look at? I am thinking that you are up to making a plaster or wood blade pattern and hub pattern, and having them cast at a bronze foundry and contracting a local machine shop to mill the slots and blade roots and pivot pins. Polish it yourself, even? Brian Whatcott Altus OK |
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#5
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Which feathering prop?
"Lauri Tarkkonen" wrote in message
... There is one question you should pay attention to: If your gearbox has not about the same reduction ratio of revs on both the forward and backwards gear, then you better to get an feathering prop that can be adjusted to different angle of attack of the blades on forward and reverse. I know J-prop does not have this, but only a few have. It is possible maxprop has. - Lauri Tarkkonen Max Prop has independent pitches forward and reverse - or, at least, my manual sez mine does... L8R Skip, totally sore from moving house -- Morgan 461 #2 SV Flying Pig http://tinyurl.com/384p2 The vessel as Tehamana, as we bought her "Twenty years from now you will be more disappointed by the things you didn't do than by the ones you did do. So throw off the bowlines. Sail away from the safe harbor. Catch the trade winds in your sails. Explore. Dream. Discover." - Mark Twain In npj0f.64$784.63@lakeread08 "Glenn Ashmore" writes: I am headed for Annapolis Thursday at o'dark thirty. One priority is to find a 3 bladed feathering prop. The candidates a Martec Auto Stream , MaxProp, VariProp and Gori. Anyone have anything good or bad to say about any of them? Any others you would recommend I look at? Any reason Autoprop is not on your list? Price? I had a two bladed Gori, and think this is perhaps the best two bladed folding prop. But when I wanted to change to a three bladed feathering prop, I ended up with j-prop: http://www.bomon.com/jprop/. I have been very happy with the performance and here in Europe it is much cheaper than the competition. -- Glenn Ashmore I'm building a 45' cutter in strip/composite. Watch my progress (or lack there of) at: http://www.rutuonline.com Shameless Commercial Division: http://www.spade-anchor-us.com |
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#6
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Which feathering prop?
"Skip Gundlach" skipgundlach at earthlink dot fishcatcher (.net) wrote in
message ... Max Prop has independent pitches forward and reverse - or, at least, my manual sez mine does... L8R Skip, totally sore from moving house New kind of physical therapy huh? ;-) Where are you and Lydia going to camp until the Pig can fly? -- Glenn Ashmore I'm building a 45' cutter in strip/composite. Watch my progress (or lack there of) at: http://www.rutuonline.com Shameless Commercial Division: http://www.spade-anchor-us.com |
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#7
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Which feathering prop?
"Brian Whatcott" wrote in message
... I am thinking that you are up to making a plaster or wood blade pattern and hub pattern, and having them cast at a bronze foundry and contracting a local machine shop to mill the slots and blade roots and pivot pins. Polish it yourself, even? Brian Whatcott Altus OK No thank you. I saw a TV show once with Paul Luke giving a tour of making one of his props. An amazing amount of work goes into those things. The tooling to cut the gears would cost more than a prop. They are beautifully machined and built like a tank but they are essentially hand made one offs. -- Glenn Ashmore I'm building a 45' cutter in strip/composite. Watch my progress (or lack there of) at: http://www.rutuonline.com Shameless Commercial Division: http://www.spade-anchor-us.com |
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#8
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Which feathering prop?
"Lauri Tarkkonen" wrote in message ... Any reason Autoprop is not on your list? Price? I had a two bladed Gori, and think this is perhaps the best two bladed folding prop. But when I wanted to change to a three bladed feathering prop, I ended up with j-prop: http://www.bomon.com/jprop/. I have been very happy with the performance and here in Europe it is much cheaper than the competition. There is one question you should pay attention to: If your gearbox has not about the same reduction ratio of revs on both the forward and backwards gear, then you better to get an feathering prop that can be adjusted to different angle of attack of the blades on forward and reverse. I know J-prop does not have this, but only a few have. It is possible maxprop has. AutoProp is a neat idea but I eliminated it for a couple of reasons. First it is not truly feathering. The blades hang loose when idle and produce some drag which can make them rotate. The other is that it relies on 3 races of exposed ball bearings that I am afraid can get caked up with barnacle cement and other trash. I had not thought of the J-prop but I will look at them. The 3 bladed Gori and MaxProp are near the top of my list. -- Glenn Ashmore I'm building a 45' cutter in strip/composite. Watch my progress (or lack there of) at: http://www.rutuonline.com Shameless Commercial Division: http://www.spade-anchor-us.com |
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#9
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Which feathering prop?
In E3m0f.78$784.41@lakeread08 "Glenn Ashmore" writes:
"Lauri Tarkkonen" wrote in message ... Any reason Autoprop is not on your list? Price? I had a two bladed Gori, and think this is perhaps the best two bladed folding prop. But when I wanted to change to a three bladed feathering prop, I ended up with j-prop: http://www.bomon.com/jprop/. I have been very happy with the performance and here in Europe it is much cheaper than the competition. There is one question you should pay attention to: If your gearbox has not about the same reduction ratio of revs on both the forward and backwards gear, then you better to get an feathering prop that can be adjusted to different angle of attack of the blades on forward and reverse. I know J-prop does not have this, but only a few have. It is possible maxprop has. AutoProp is a neat idea but I eliminated it for a couple of reasons. First it is not truly feathering. The blades hang loose when idle and produce some drag which can make them rotate. The other is that it relies on 3 races of exposed ball bearings that I am afraid can get caked up with barnacle cement and other trash. If your propeller axis is not perfectly horizontal the three bladed feathering propeller will vause some drag. I have not heard about the problem of Autoprop would rotate, but if you put your gear on, I am sure it will not. I have been asking people who have Autoprops, when I have seen them working on their boats, but even if there have been some barnacles on the prop, nobody admitted that it has affected the rotation of the blades. Of course most people I have met are in the Baltic, where the barnacle problem is not that big. I had not thought of the J-prop but I will look at them. The 3 bladed Gori and MaxProp are near the top of my list. If you have to fix the angle of the blades differently for forward and reverse then MaxProp is yours, if it can be symmetric J-prop comes much cheaper (at least here in Finland). If you choose a Gori, you should check the vedge that locks the propeller in the axis. Earlier they were made of brass, and I know a couple of cases, my own boat included where the vedge has been split into two and the propeller has fallen off. (They could not find it in the mud of the harbour bottom. :-)). Use steel. - Lauri Tarkkonen -- Glenn Ashmore I'm building a 45' cutter in strip/composite. Watch my progress (or lack there of) at: http://www.rutuonline.com Shameless Commercial Division: http://www.spade-anchor-us.com |
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#10
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Which feathering prop?
On Mon, 3 Oct 2005 22:48:15 -0400,
Glenn Ashmore wrote: "Lauri Tarkkonen" wrote in message ... Any reason Autoprop is not on your list? Price? I had a two bladed Gori, and think this is perhaps the best two bladed folding prop. But when I wanted to change to a three bladed feathering prop, I ended up with j-prop: http://www.bomon.com/jprop/. I have been very happy with the performance and here in Europe it is much cheaper than the competition. There is one question you should pay attention to: If your gearbox has not about the same reduction ratio of revs on both the forward and backwards gear, then you better to get an feathering prop that can be adjusted to different angle of attack of the blades on forward and reverse. I know J-prop does not have this, but only a few have. It is possible maxprop has. AutoProp is a neat idea but I eliminated it for a couple of reasons. First it is not truly feathering. The blades hang loose when idle and produce some drag which can make them rotate. The other is that it relies on 3 races of exposed ball bearings that I am afraid can get caked up with barnacle cement and other trash. I had not thought of the J-prop but I will look at them. The 3 bladed Gori and MaxProp are near the top of my list. Please keep us posted on what you decide on, and why, and maybe how well it works? I for one am interested. We will need a new prop for Windwalker in a year or so, our current fixed blade has slight "pinking" on the leading edges, no major worry, but owrth replacing before we cast off. A feathering prop is a maybe, depending on cost, and benefit. -- Jim Richardson http://www.eskimo.com/~warlock Unix has security which has been tested by conniving, unscrupulous college students over generations. |
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