#271
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Better Braking?
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#272
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Better Braking?
Sir Ridesalot writes:
On Saturday, 15 February 2020 12:32:22 UTC-5, Ted Heise wrote: On Sat, 15 Feb 2020 08:50:32 -0600, AMuzi wrote: On 2/14/2020 10:18 PM, Frank Krygowski wrote: Well, someone could always very precisely measure some aspect another guy cares nothing about and call it 'data'. I don't think it's better to give no measurements, nothing but a vague "mine is better" opinion, and say "data doesn't matter." Regarding the topic, braking, ditto. No one disputes that big fluid discs have better peak braking power and heat dissipation for sustained braking power. One might chart those factors impressively in comparison to rim brakes. For the bike I ride this time of year, a simple sidepull front with fixed gear is perfectly adequate and I've never wanted for more braking power[1] on that bike given the way I use it. I'm not Jay, nor Joerg, who have different needs and taste. [1] what that bike really needs is a heater! My fixed gear is set up the same way; that is, just a simple front rim brake. Just coming out of single digit temps here; this heater idea has some appeal. Perhaps an e-bike battery could be re-purposed? -- Ted Heise West Lafayette, IN, USA A can of Sterno or similar gel-alcohol fuel mounted on a gimble mount, and shielded from the wind will work. I did it once for fun. I had an inverted funnel over the windshield of the Sterno can and a flexible metal hose attached to the funnel and then insulated where I had it go under my jacket. Cheers Build a man a fire, and he'll be warm for a day. Set a man on fire, and he'll be warm for the rest of his life. Terry Pratchett |
#274
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Equipping for the cold (was: Better Braking?)
On Sat, 15 Feb 2020 14:02:32 -0800,
Mark J. wrote: On 2/15/2020 1:23 PM, Ted Heise wrote: On Sat, 15 Feb 2020 10:08:04 -0800 (PST), Sir Ridesalot wrote: On Saturday, 15 February 2020 12:32:22 UTC-5, Ted Heise wrote: On Sat, 15 Feb 2020 08:50:32 -0600, AMuzi wrote: [1] what that bike really needs is a heater! Just coming out of single digit temps here; this heater idea has some appeal. Perhaps an e-bike battery could be re-purposed? A can of Sterno or similar gel-alcohol fuel mounted on a gimble mount, and shielded from the wind will work. I did it once for fun. I had an inverted funnel over the windshield of the Sterno can and a flexible metal hose attached to the funnel and then insulated where I had it go under my jacket. Interesting. But where I really need the heat is my fingers and toes! Stick-on "chemical" toe warmers really help. By "chemical" I mean powered by rusting/oxidation of iron filings (really). They make a massive difference, especially if Reynaud's syndrome (or more likely, a very mild version of Reynaud's) is suspected. Not Raynaud syndrome in my case, but I was diagnosed with venous insufficiency a number of years ago--so my lower limb circulaton is not great. I've been aware of the products you mention, and may just have to get myself over the activation energy barrier to try some! -- Ted Heise West Lafayette, IN, USA |
#275
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Better Braking?
I was replying to your pedantic remark 'As always: Sorry for introducing real numbers into a discussion. '. Those are not real numbers and certainly can not be checked. We have to believe you. In that case we can also believe Tom saying that thy dyno slowed him down considerably. BTW I think going from 20 to 19 mph is quite a bit for some. Bottom line is a dyno(hub) cost you 5-10 W, a battery powered light not.
Putting some numbers into bikecalculator.com suggests that the difference between 20 and 19 mph is about 26 watts (207 vs. 181), which is a lot. |
#276
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Better Braking?
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#277
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Better Braking?
On 2/15/2020 8:28 PM, sms wrote:
On 2/15/2020 3:03 PM, wrote: snip I was replying to your pedantic remark 'As always: Sorry for introducing real numbers into a discussion. '. Those are not real numbers and certainly can not be checked. We have to believe you. In that case we can also believe Tom saying that thy dyno slowed him down considerably. BTW I think going from 20 to 19 mph is quite a bit for some. Bottom line is a dyno(hub) cost you 5-10 W, a battery powered light not. It's very important to distinguish actual data from trusted sources from data from untrusted sources which is also fabricated in order to attempt to support a specific agenda. Sadly, we've seen fabricated data for decades from the person you are referring to. Fabricated data is worse than no data at all. You've seen me link data from laboratory tests many, many times. You've always ignored any data that disproves your claims. Try these: https://www.cyclingabout.com/dynamo-...g-lab-testing/ https://fahrradzukunft.de/18/laborte...aeuferdynamos/ http://bicycle-test-reviews.com/best...he-efficiency/ And I've posted many more over the years. -- - Frank Krygowski |
#278
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Better Braking?
On 2/16/2020 10:11 AM, Bertrand wrote:
I was replying to your pedantic remark 'As always: Sorry for introducing real numbers into a discussion. '. Those are not real numbers and certainly can not be checked. We have to believe you. In that case we can also believe Tom saying that thy dyno slowed him down considerably. BTW I think going from 20 to 19 mph is quite a bit for some. Bottom line is a dyno(hub) cost you 5-10 W, a battery powered light not. Putting some numbers into bikecalculator.com suggests that the difference between 20 and 19 mph is about 26 watts (207 vs. 181), which is a lot. Assuming those calculations are correct: Is that "a lot"? How do we judge? If told "It's enough to slow you down from 20 mph to 19 mph," I think most people who were not riding to race would say "Oh, that's not so bad." It's certainly not as bad as Tom pretended to believe, which was my main point. -- - Frank Krygowski |
#279
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Better Braking?
On Sunday, February 16, 2020 at 11:44:29 AM UTC-8, Frank Krygowski wrote:
On 2/16/2020 10:11 AM, Bertrand wrote: I was replying to your pedantic remark 'As always: Sorry for introducing real numbers into a discussion. '. Those are not real numbers and certainly can not be checked. We have to believe you. In that case we can also believe Tom saying that thy dyno slowed him down considerably. BTW I think going from 20 to 19 mph is quite a bit for some. Bottom line is a dyno(hub) cost you 5-10 W, a battery powered light not. Putting some numbers into bikecalculator.com suggests that the difference between 20 and 19 mph is about 26 watts (207 vs. 181), which is a lot. Assuming those calculations are correct: Is that "a lot"? How do we judge? If told "It's enough to slow you down from 20 mph to 19 mph," I think most people who were not riding to race would say "Oh, that's not so bad." It's bad if your killing yourself to hold 20mph to stay on a wheel, which I was actually doing the other night on my way home. Next time I'll shut off my light to see if it gives me any extra speed. I have my battery light that I use as a pulsing light and can use that. More dyno science experiments.. Next I'm going to get a Van de graaff generator for my bike or maybe a flux capacitor. -- Jay Beattie. |
#280
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Better Braking?
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