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#1
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On Mon, 12 Mar 2001 23:38:10 GMT, Wilko wrote:
I tried wrapping the bars with string. It helped but not enough. I'll probably end up with black pipe insulation, attached with wire ties. I hate the looks of duct tape. Duct tape is ok on black pipe insulation if you can find black duct tape. I used tie wraps (brand name?) to keep foam pipe insulation on the vertical pipes on my roofrack, that really helps keep the noise down (well, as long as I stay under 120 mph on the Autobahn, that is... :-)). My thought, instead of wire tie wraps (which, I think, would have to be cut off and replaced if I need a flat rack surface), is to use nylon straps to hold the pipe insulation in place as needed. I'm thinking of such straps sold in camping or automotive departments... -- cheers, Stephen |
#2
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![]() "Stephen Bird" wrote in message ... On Mon, 12 Mar 2001 23:38:10 GMT, Wilko wrote: I tried wrapping the bars with string. It helped but not enough. I'll probably end up with black pipe insulation, attached with wire ties. I hate the looks of duct tape. Duct tape is ok on black pipe insulation if you can find black duct tape. I used tie wraps (brand name?) to keep foam pipe insulation on the vertical pipes on my roofrack, that really helps keep the noise down (well, as long as I stay under 120 mph on the Autobahn, that is... :-)). My thought, instead of wire tie wraps (which, I think, would have to be cut off and replaced if I need a flat rack surface), is to use nylon straps to hold the pipe insulation in place as needed. I'm thinking of such straps sold in camping or automotive departments... I tried both string & foam without luck. I still got a constant pitch howl that became louder with speed. Then a banged a bar while carrying it & realized that it's ring was the same pitch as the howl. It was a bell & that was it's resonant frequency. So I filled the bars with sand. They are heavy, but the noise is gone. Lloyd Bowles www.madcanoeist.4ever.cc |
#3
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I had a great laugh at myself after posting my message. The original thread
was started three years ago. I must have been saving the message until I needed the information. lol "Stephen Bird" wrote in message replying to... On Mon, 12 Mar 2001 23:38:10 GMT, Wilko wrote: My thought, instead of wire tie wraps (which, I think, would have to be cut off and replaced if I need a flat rack surface), is to use nylon straps... On Sat, 20 Mar 2004 21:50:52 -0500, "Lloyd Bowles" wrote: Then a banged a bar while carrying it & realized that it's ring was the same pitch as the howl. It was a bell & that was it's resonant frequency. So I filled the bars with sand. They are heavy, but the noise is gone. Wow... now that is what I'd call observant! :-) I wonder if foam insulation (which is sprayed and expands on use) would work? Is the purpose of the sand simply to fill the hollow part of the bar? -- cheers, Stephen |
#4
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....stuff deleted
I tried both string & foam without luck. I still got a constant pitch howl that became louder with speed. Then a banged a bar while carrying it & realized that it's ring was the same pitch as the howl. It was a bell & that was it's resonant frequency. So I filled the bars with sand. They are heavy, but the noise is gone. You probably don't need to fill the entire bar. I'd probably try caulking the ends first and see if that works. Jam some paper in about 3-4 inches and fill the end of the bar with caulk. Over the years, I've lost end caps and rather than replace them, this worked pretty nicely (and there is always extra caulk around). If the noise persists, I would think that the bar/mount attachment isn't tight enough. It it is, there should be no vibration along the length of the bar (hence, no noise). Rick |
#5
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![]() "Rick" wrote in message hlink.net... that was it's resonant frequency. So I filled the bars with sand. They are heavy, but the noise is gone. You probably don't need to fill the entire bar. I'd probably try caulking the ends first and see if that works. Jam some paper in about 3-4 inches and fill the end of the bar with caulk. Over the years, I've lost end caps and rather than replace them, this worked pretty nicely (and there is always extra caulk around). My bar still had end caps. The noise was due to the resonant frequency of the bar as a big chunk of metal, not as an organ pipe. So just plugging the ends would do nothing. I agree though that I probably didn't need to totally fill them to eliminate the noise. I'd worry though about the sand mass slamming into & removing an endcap when I do my normal abrupt turns. If the noise persists, I would think that the bar/mount attachment isn't tight enough. It it is, there should be no vibration along the length of the bar (hence, no noise). It's tight. Or at least as tight as plastic towers allow. I like thumping things to hear or feel them resonate & have found some solidly welded masses that can vibrate for a long time. The big ones are at a frequency below hearing. Lloyd |
#6
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Lloyd Bowles wrote:
"Rick" wrote in message hlink.net... that was it's resonant frequency. So I filled the bars with sand. They are heavy, but the noise is gone. You probably don't need to fill the entire bar. I'd probably try caulking the ends first and see if that works. Jam some paper in about 3-4 inches and fill the end of the bar with caulk. Over the years, I've lost end caps and rather than replace them, this worked pretty nicely (and there is always extra caulk around). My bar still had end caps. The noise was due to the resonant frequency of the bar as a big chunk of metal, not as an organ pipe. So just plugging the ends would do nothing. I agree though that I probably didn't need to totally fill them to eliminate the noise. I'd worry though about the sand mass slamming into & removing an endcap when I do my normal abrupt turns. If the noise persists, I would think that the bar/mount attachment isn't tight enough. It it is, there should be no vibration along the length of the bar (hence, no noise). It's tight. Or at least as tight as plastic towers allow. I like thumping things to hear or feel them resonate & have found some solidly welded masses that can vibrate for a long time. The big ones are at a frequency below hearing. I pity the poor guy, driving behind you, if your caps should ever come off. Sandblasted! g Larry |
#7
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![]() "Lawrence Glasser" wrote in message ... Lloyd Bowles wrote: My bar still had end caps. The noise was due to the resonant frequency of the bar as a big chunk of metal, not as an organ pipe. So just plugging the ends would do nothing. I agree though that I probably didn't need to totally fill them to eliminate the noise. I'd worry though about the sand mass slamming into & removing an endcap when I do my normal abrupt turns. I pity the poor guy, driving behind you, if your caps should ever come off. I have a bigger worry for you. I didn't bother with tower locks when I got the racks. Theft isn't very likely in my village & there was no mention of other reasons for the locks. I drove somewhere & found that a tower was adrift because the latch holding the tower to track adapter was open. I thought I had missed latching it until it happened a few more times. A little sandblasting is nothing compared to hitting a sand filled bar with canoe attached. I have locks now, just to keep the latches from opening themselves. Lloyd www.madcanoeist.4ever.cc |
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