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Air horn in cold weather?
I have one of those $25 air horns - this kind of thing:
http://www.nycewheels.com/air-zound-horn.html It is very useful for commuting, capable of easily penetrating the headphones of joggers and such. However, I never used it in winter before because it was too much to take off the bike when parking outside at the office. Various lights, batteries, etc. Now I will be able to bring the new bike into the building. So, while I could continue to use it, I'm concerned about the effect of cold on the bottle and its contents (air). Surely it not last as long, but will the bottle get brittle and explode? I think it is best to not find out the hard way. |
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#2
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Air horn in cold weather?
On 2010-09-15, dgk wrote:
I have one of those $25 air horns - this kind of thing: http://www.nycewheels.com/air-zound-horn.html It is very useful for commuting, capable of easily penetrating the headphones of joggers and such. However, I never used it in winter before because it was too much to take off the bike when parking outside at the office. Various lights, batteries, etc. Now I will be able to bring the new bike into the building. So, while I could continue to use it, I'm concerned about the effect of cold on the bottle and its contents (air). Surely it not last as long, but will the bottle get brittle and explode? I think it is best to not find out the hard way. I have no direct experience with air horns, but in general lower temperature will lower the pressure in the reservoir, which will probably cause it to become ineffective sooner (although returning it to a higher temperature will restore it). The reservoir is likely metal, and the cold will not affect it. In fact, the lower pressure in cold temperatures will put it under less stress than it would otherwise suffer. -- -John ) |
#3
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Air horn in cold weather?
On Wed, 15 Sep 2010 21:55:19 -0500, John Thompson
wrote: On 2010-09-15, dgk wrote: I have one of those $25 air horns - this kind of thing: http://www.nycewheels.com/air-zound-horn.html It is very useful for commuting, capable of easily penetrating the headphones of joggers and such. However, I never used it in winter before because it was too much to take off the bike when parking outside at the office. Various lights, batteries, etc. Now I will be able to bring the new bike into the building. So, while I could continue to use it, I'm concerned about the effect of cold on the bottle and its contents (air). Surely it not last as long, but will the bottle get brittle and explode? I think it is best to not find out the hard way. I have no direct experience with air horns, but in general lower temperature will lower the pressure in the reservoir, which will probably cause it to become ineffective sooner (although returning it to a higher temperature will restore it). The reservoir is likely metal, and the cold will not affect it. In fact, the lower pressure in cold temperatures will put it under less stress than it would otherwise suffer. Nope, the resevoir is a plastic bottle, likely a bit thicker than a standard soda bottle. If it were metal I wouldn't be too concerned, but being plastic... Here's a better pictu http://www.amazon.com/Delta-Airzound.../dp/B000ACAMJC I've noted before how nice they are to lower the price to below that eligible for free shipping. |
#4
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Air horn in cold weather?
On 15 Sep, 14:46, dgk wrote:
I have one of those $25 air horns - this kind of thing: http://www.nycewheels.com/air-zound-horn.html It is very useful for commuting, capable of easily penetrating the headphones of joggers and such. However, I never used it in winter before because it was too much to take off the bike when parking outside at the office. Various lights, batteries, etc. Now I will be able to bring the new bike into the building. So, while I could continue to use it, I'm concerned about the effect of cold on the bottle and its contents (air). Surely it not last as long, but will the bottle get brittle and explode? I think it is best to not find out the hard way. I expect the design has accounted for winter use, at least if it has European origins. |
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Air horn in cold weather?
On Sep 16, 7:42*am, dgk wrote:
On Wed, 15 Sep 2010 21:55:19 -0500, John Thompson wrote: On 2010-09-15, dgk wrote: I have one of those $25 air horns - this kind of thing: http://www.nycewheels.com/air-zound-horn.html It is very useful for commuting, capable of easily penetrating the headphones of joggers and such. However, I never used it in winter before because it was too much to take off the bike when parking outside at the office. Various lights, batteries, etc. Now I will be able to bring the new bike into the building. So, while I could continue to use it, I'm concerned about the effect of cold on the bottle and its contents (air). Surely it not last as long, but will the bottle get brittle and explode? I think it is best to not find out the hard way. I have no direct experience with air horns, but in general lower temperature will lower the pressure in the reservoir, which will probably cause it to become ineffective sooner (although returning it to a higher temperature will restore it). The reservoir is likely metal, and the cold will not affect it. In fact, the lower pressure in cold temperatures will put it under less stress than it would otherwise suffer. * Nope, the resevoir is a plastic bottle, likely a bit thicker than a standard soda bottle. If it were metal I wouldn't be too concerned, but being plastic... Here's a better pictu http://www.amazon.com/Delta-Airzound.../dp/B000ACAMJC I've noted before how nice they are to lower the price to below that eligible for free shipping. On Myth Busters, the pumped up a 2 liter bottle until it exploded at 150 PSI, so I have no concerns about using regular 20/24 oz soda bottles. The only thing I could think of is moisture forming ice in the hose or horn. Bringing it inside should melt it before the next trip. Perhaps a little calcium chloride in the bottle would absorb the moisture. |
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Air horn in cold weather?
On Fri, 17 Sep 2010 04:29:51 -0700 (PDT), Mike A Schwab
wrote: On Sep 16, 7:42*am, dgk wrote: On Wed, 15 Sep 2010 21:55:19 -0500, John Thompson wrote: On 2010-09-15, dgk wrote: I have one of those $25 air horns - this kind of thing: http://www.nycewheels.com/air-zound-horn.html It is very useful for commuting, capable of easily penetrating the headphones of joggers and such. However, I never used it in winter before because it was too much to take off the bike when parking outside at the office. Various lights, batteries, etc. Now I will be able to bring the new bike into the building. So, while I could continue to use it, I'm concerned about the effect of cold on the bottle and its contents (air). Surely it not last as long, but will the bottle get brittle and explode? I think it is best to not find out the hard way. I have no direct experience with air horns, but in general lower temperature will lower the pressure in the reservoir, which will probably cause it to become ineffective sooner (although returning it to a higher temperature will restore it). The reservoir is likely metal, and the cold will not affect it. In fact, the lower pressure in cold temperatures will put it under less stress than it would otherwise suffer. * Nope, the resevoir is a plastic bottle, likely a bit thicker than a standard soda bottle. If it were metal I wouldn't be too concerned, but being plastic... Here's a better pictu http://www.amazon.com/Delta-Airzound.../dp/B000ACAMJC I've noted before how nice they are to lower the price to below that eligible for free shipping. On Myth Busters, the pumped up a 2 liter bottle until it exploded at 150 PSI, so I have no concerns about using regular 20/24 oz soda bottles. The only thing I could think of is moisture forming ice in the hose or horn. Bringing it inside should melt it before the next trip. Perhaps a little calcium chloride in the bottle would absorb the moisture. Why not just pump it up outside? You'll be pumping it up with dry air and it won't lose pressure because of the cold. |
#8
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Air horn in cold weather?
On Sep 15, 9:46*am, dgk wrote:
I have one of those $25 air horns - this kind of thing: http://www.nycewheels.com/air-zound-horn.html It is very useful for commuting, capable of easily penetrating the headphones of joggers and such. However, I never used it in winter before because it was too much to take off the bike when parking outside at the office. Various lights, batteries, etc. Now I will be able to bring the new bike into the building. So, while I could continue to use it, I'm concerned about the effect of cold on the bottle and its contents (air). Surely it not last as long, but will the bottle get brittle and explode? I think it is best to not find out the hard way. I suppose that there's an off chance that a sharp blow would shatter the bottle when fully inflated, maybe slightly more likely in the cold, but I'd wager that they've thought this through and are using a plastic that's somewhat less affected by temperature. I pretty regularly keep plastic bottles of tonic water which have been abused in the 'fridge without suffering explosions. As to the PV=RT question: if you're pumping the chamber up out-of-doors (as it is so quaintly put) when the example temp is -15F to a mild 120psi, and then bringing the bicycle in, air- horn undischarged, to a 78F building, you'll see a rise to 445:538::120:x or about 145psi. |
#9
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Air horn in cold weather?
On Mon, 18 Oct 2010 16:22:49 -0700 (PDT), Norman
wrote: On Sep 15, 9:46*am, dgk wrote: I have one of those $25 air horns - this kind of thing: http://www.nycewheels.com/air-zound-horn.html It is very useful for commuting, capable of easily penetrating the headphones of joggers and such. However, I never used it in winter before because it was too much to take off the bike when parking outside at the office. Various lights, batteries, etc. Now I will be able to bring the new bike into the building. So, while I could continue to use it, I'm concerned about the effect of cold on the bottle and its contents (air). Surely it not last as long, but will the bottle get brittle and explode? I think it is best to not find out the hard way. I suppose that there's an off chance that a sharp blow would shatter the bottle when fully inflated, maybe slightly more likely in the cold, but I'd wager that they've thought this through and are using a plastic that's somewhat less affected by temperature. I pretty regularly keep plastic bottles of tonic water which have been abused in the 'fridge without suffering explosions. As to the PV=RT question: if you're pumping the chamber up out-of-doors (as it is so quaintly put) when the example temp is -15F to a mild 120psi, and then bringing the bicycle in, air- horn undischarged, to a 78F building, you'll see a rise to 445:538::120:x or about 145psi. It occurs to me that I've always kept the bottle in the unheated garage when I wasn't using the horn over the winter, so I guess at least it won't crack with the pressure, but it's a good point about the pressure increasing when I bring it into a heated building! The safest idea would be to fill it in the building. |
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