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#21
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I am that out of date
Jeff Liebermann wrote:
On Sat, 17 Apr 2021 16:16:05 -0700 (PDT), " wrote: Now I am aware of them new fangled high tech bamboo bikes, but other than that, I don't think bicycles will be too flammable. Metal doesn't burn too well. Although I think I have seen some YouTube videos of some metal that does catch fire and burn really hot. But I don't think bikes are made out of that special metal. I'm guessing that special metal might also cost a whole lot. And $100k bikes won't sell too well. Sounds like a magnesium bicycle frame: https://www.google.com/search?q=magnesium+bicycle+frame&tbm=isch Magnesium burns VERY well. All metals burn - some more quickly than others. Grind any metal bike component into a fine enough power and add sufficient heat and Oxygen and it’ll burn. |
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#22
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I am that out of date
On 4/18/2021 2:09 AM, Tosspot wrote:
On 17/04/2021 17:53, Ralph Barone wrote: Don’t forget the chromed steel rims. Nobody appears to be lamenting the demise of chromed steel rims. In the ****ed up world of retro bikes I have seen a few at work with chromed steel rims.Â* Now those don't get ridden in the rain or I wouldn't be seeing them! Imho, the two biggest advancements to modern cycling, the alloy rim and bike lights.Â* Hand up who remembers cycling home in the dark on a rainy night?Â* NiCads suck. Pre_NiCad there were decent lights (in terms of illumination) using SLA (Sealed Lead Acid) batteries. Yes those were heavy batteries but for a fairly level commute they were fine. I had a home-built system on my commuter bike using two 14 watt/12 volt sealed beams: https://drive.google.com/file/d/1npvEt_RzvIu_vbsOuSzN6BIrhy0BWTU5/. There were some HID bicycle lights, briefly, before LED technology advanced to a usable level, but they were very expensive and not widely used. The big advancement in lighting is that you can now buy a decent bicycle light for as little as $40, complete with a rechargeable battery. |
#23
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I am that out of date
On 4/17/2021 11:59 PM, Jeff Liebermann wrote:
On Sat, 17 Apr 2021 16:16:05 -0700 (PDT), " wrote: Now I am aware of them new fangled high tech bamboo bikes, but other than that, I don't think bicycles will be too flammable. Metal doesn't burn too well. Although I think I have seen some YouTube videos of some metal that does catch fire and burn really hot. But I don't think bikes are made out of that special metal. I'm guessing that special metal might also cost a whole lot. And $100k bikes won't sell too well. Sounds like a magnesium bicycle frame: https://www.google.com/search?q=magnesium+bicycle+frame&tbm=isch Magnesium burns VERY well. Well, that depends. If you're talking about components of reasonable thickness, some magnesium alloys can burn under certain circumstances, while others are more resistant. https://www.google.com/url?sa=t&rct=...b9EItpV4Srzeyj Original Volkswagens had magnesium alloy crankcases, and nobody worries excessively about them catching fire. OTOH, a strip of pure magnesium foil is really easy to burn, and it burns very brightly indeed. Same is true of chips, I've heard. BTW, titanium chips can also burn and are very hard to extinguish. A machinist I knew once had that experience. But it's not a huge hazard in my limited experience. We had a student team who, for their first lathe project, mistakenly grabbed a 2" bar of titanium instead of mild steel. While they were having a hell of a time trying to turn it, they did generate some chips but no fire. -- - Frank Krygowski |
#24
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I am that out of date
On Sun, 18 Apr 2021 14:16:58 +0000 (UTC), Ralph Barone
wrote: Jeff Liebermann wrote: On Sat, 17 Apr 2021 16:16:05 -0700 (PDT), " wrote: Now I am aware of them new fangled high tech bamboo bikes, but other than that, I don't think bicycles will be too flammable. Metal doesn't burn too well. Although I think I have seen some YouTube videos of some metal that does catch fire and burn really hot. But I don't think bikes are made out of that special metal. I'm guessing that special metal might also cost a whole lot. And $100k bikes won't sell too well. Sounds like a magnesium bicycle frame: https://www.google.com/search?q=magnesium+bicycle+frame&tbm=isch Magnesium burns VERY well. All metals burn - some more quickly than others. Grind any metal bike component into a fine enough power and add sufficient heat and Oxygen and it’ll burn. True. Burning is just rapid oxidation. However, I would have a problem with presenting slow rusting of iron as burning. What distinguishes burning from rusting is that burning produces considerable light and is often exothermic producing additional heat which sustains the oxidation reaction. The reaction also occurs rapidly. Grinding a metal bicycle into dust increases the surface area of the metal available for oxidation. That makes the metal oxidize more rapidly, eventually resulting in something that resembles a bright flash or burning. Fun with magnesium: "The Hazards of Polishing Magnesium can cause Fires" https://www.youtube.com/watch?v=bWoVo-aQ2tg Note that magnesium valve cover is not burning, only the finely divided powder is burning. That means you can have a nice shinny magnesium bicycle frame, if you give burning shavings as offerings to the gods. -- Jeff Liebermann PO Box 272 http://www.LearnByDestroying.com Ben Lomond CA 95005-0272 Skype: JeffLiebermann AE6KS 831-336-2558 |
#25
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I am that out of date
On Sun, 18 Apr 2021 11:52:52 -0400, Frank Krygowski
wrote: https://www.google.com/url?sa=t&rct=...b9EItpV4Srzeyj Minor off topic trivia. This is the same as the above URL with all the Google search and tracking junk removed: https://www.nanomag.us/pdfs/nanoMAG_FAA_Flamability_test_AR11-13.pdf I use a Firefox browser plug in to automagically remove all the tracking info: https://addons.mozilla.org/en-US/firefox/addon/clearurls/ There are other plugins that do the same thing generally found under "clean urls" description. -- Jeff Liebermann PO Box 272 http://www.LearnByDestroying.com Ben Lomond CA 95005-0272 Skype: JeffLiebermann AE6KS 831-336-2558 |
#26
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I am that out of date
On 4/17/2021 6:10 PM, John B. wrote:
On Sat, 17 Apr 2021 07:22:20 -0700 (PDT), Tom Kunich wrote: On Saturday, April 17, 2021 at 5:42:17 AM UTC-7, sms wrote: On 4/16/2021 6:17 PM, Jeff Liebermann wrote: snip Not good enough. Soon, the 22 speed corn cob will become the de facto standard for excellence in cycling overkill. http://www.learnbydestroying.com/jeffl/pics/bicycles/#Corn%2520Cobb%2520Freewheel.jpg To make a reasonably straight chain line with 22 gears, just stack up two identical triple gear chain rings that cover 2 or 3 adjacent gears on the freewheel. Shifting both front and rear derailleurs simultaneously might require contortionist or a computer, but those are easy enough to find. It might also be rather difficult to ride, but that's easily forgiven by owner in trade for the cool looking photo opportunities. Patents pending. Soon everyone will be riding on 22 speed freewheels and cassettes. This is really impractical in terms of wheel building. I like the wide-range 12 speed cassettes but that's about the limit. On my touring bike I paired a Garbaruk 12 cog 10-52 Cassette https://www.garbaruk.com/12-speed-xd.html with an SRAM DD3 dual drive hub https://lunacycle.com/sram-dd3-igh-3-speed-hub-with-shifter/ and added a Mountain Tamer Quad 4th chainring http://abundantadventures.com/quads.html#MOUNTAIN_TAMER_QUADTM_49.95, then added a Schlumpf Mountain Drive http://www.schlumpfdrive.com/index.php/mountain-drive.html. It's nice having a selection of 288 different gear combinations though because of overlap it's really only 123 actual different gear ratios. The range between the lowest gear and the highest gear is amazing. The lowest gear is so low that even at a cadence of 240 rpm you're not going fast enough to stay upright. The highest gear is so high that it's only usable when going downhill on grades of 12% or more at speeds of 80 mph or greater. It's kind of a pain dealing with four separate gear shifters but there are some after-market wireless electronic shifters that I may add and control them with a smart phone app. Then I'll put the bike up for sale on eBay and when no one is willing to pay what I spent on these improvements I'll complain about it here. I was disappointed to learn that there is no 14 speed Rohloff SPEEDHUB that can accept a cassette so my dream of 1,344 gear combinations was thwarted. Well at least we the comedic fools that love to post about things they know so little about. Except Jay, who feels the need to tout "modern" construction and components to use of them because he got them at cut rate prices through his son. "Well at least we the comedic fools that love to post about things they know so little about."??? Well you misspelled "comic" but otherwise you seem to be describing yourself. I think he meant 'comedic'. -- Andrew Muzi www.yellowjersey.org/ Open every day since 1 April, 1971 |
#27
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I am that out of date
On 4/18/2021 9:16 AM, Ralph Barone wrote:
Jeff Liebermann wrote: On Sat, 17 Apr 2021 16:16:05 -0700 (PDT), " wrote: Now I am aware of them new fangled high tech bamboo bikes, but other than that, I don't think bicycles will be too flammable. Metal doesn't burn too well. Although I think I have seen some YouTube videos of some metal that does catch fire and burn really hot. But I don't think bikes are made out of that special metal. I'm guessing that special metal might also cost a whole lot. And $100k bikes won't sell too well. Sounds like a magnesium bicycle frame: https://www.google.com/search?q=magnesium+bicycle+frame&tbm=isch Magnesium burns VERY well. All metals burn - some more quickly than others. Grind any metal bike component into a fine enough power and add sufficient heat and Oxygen and it’ll burn. mmmmm. interesting. Most bicycles have a nice mix of steel and aluminum... https://tinyurl.com/n4hxesdy -- Andrew Muzi www.yellowjersey.org/ Open every day since 1 April, 1971 |
#28
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I am that out of date
AMuzi wrote:
On 4/18/2021 9:16 AM, Ralph Barone wrote: Jeff Liebermann wrote: On Sat, 17 Apr 2021 16:16:05 -0700 (PDT), " wrote: Now I am aware of them new fangled high tech bamboo bikes, but other than that, I don't think bicycles will be too flammable. Metal doesn't burn too well. Although I think I have seen some YouTube videos of some metal that does catch fire and burn really hot. But I don't think bikes are made out of that special metal. I'm guessing that special metal might also cost a whole lot. And $100k bikes won't sell too well. Sounds like a magnesium bicycle frame: https://www.google.com/search?q=magnesium+bicycle+frame&tbm=isch Magnesium burns VERY well. All metals burn - some more quickly than others. Grind any metal bike component into a fine enough power and add sufficient heat and Oxygen and it’ll burn. mmmmm. interesting. Most bicycles have a nice mix of steel and aluminum... https://tinyurl.com/n4hxesdy Bike? What bike? I’ve just got this block of slag here. |
#29
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I am that out of date
On Sunday, April 18, 2021 at 11:52:56 AM UTC-4, Frank Krygowski wrote:
On 4/17/2021 11:59 PM, Jeff Liebermann wrote: On Sat, 17 Apr 2021 16:16:05 -0700 (PDT), " wrote: Now I am aware of them new fangled high tech bamboo bikes, but other than that, I don't think bicycles will be too flammable. Metal doesn't burn too well. Although I think I have seen some YouTube videos of some metal that does catch fire and burn really hot. But I don't think bikes are made out of that special metal. I'm guessing that special metal might also cost a whole lot. And $100k bikes won't sell too well. Sounds like a magnesium bicycle frame: https://www.google.com/search?q=magnesium+bicycle+frame&tbm=isch Magnesium burns VERY well. Well, that depends. If you're talking about components of reasonable thickness, some magnesium alloys can burn under certain circumstances, while others are more resistant. https://www.google.com/url?sa=t&rct=...b9EItpV4Srzeyj Original Volkswagens had magnesium alloy crankcases, and nobody worries excessively about them catching fire. OTOH, a strip of pure magnesium foil is really easy to burn, and it burns very brightly indeed. Same is true of chips, I've heard. BTW, titanium chips can also burn and are very hard to extinguish. A machinist I knew once had that experience. But it's not a huge hazard in my limited experience. We had a student team who, for their first lathe project, mistakenly grabbed a 2" bar of titanium instead of mild steel. Seems to me the weight difference should have tipped him off that he had the wrong stuff |
#30
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I am that out of date
On Tuesday, April 20, 2021 at 11:12:14 AM UTC-7, wrote:
On Sunday, April 18, 2021 at 11:52:56 AM UTC-4, Frank Krygowski wrote: On 4/17/2021 11:59 PM, Jeff Liebermann wrote: On Sat, 17 Apr 2021 16:16:05 -0700 (PDT), " wrote: Now I am aware of them new fangled high tech bamboo bikes, but other than that, I don't think bicycles will be too flammable. Metal doesn't burn too well. Although I think I have seen some YouTube videos of some metal that does catch fire and burn really hot. But I don't think bikes are made out of that special metal. I'm guessing that special metal might also cost a whole lot. And $100k bikes won't sell too well. Sounds like a magnesium bicycle frame: https://www.google.com/search?q=magnesium+bicycle+frame&tbm=isch Magnesium burns VERY well. Well, that depends. If you're talking about components of reasonable thickness, some magnesium alloys can burn under certain circumstances, while others are more resistant. https://www.google.com/url?sa=t&rct=...b9EItpV4Srzeyj Original Volkswagens had magnesium alloy crankcases, and nobody worries excessively about them catching fire. OTOH, a strip of pure magnesium foil is really easy to burn, and it burns very brightly indeed. Same is true of chips, I've heard. BTW, titanium chips can also burn and are very hard to extinguish. A machinist I knew once had that experience. But it's not a huge hazard in my limited experience. We had a student team who, for their first lathe project, mistakenly grabbed a 2" bar of titanium instead of mild steel. Seems to me the weight difference should have tipped him off that he had the wrong stuff No kidding --- and imagine the difference in lab fees. Dang. The scrap heap at my metals class didn't include Ti. You had to bring that from home. -- Jay Beattie. |
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