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#22
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learn by destroying
On Tue, 19 Dec 2017 03:43:08 -0800 (PST), wrote:
What is the difference tween a mallet n a hammer A hammer is made for applying a controlled force to an object such as a nail into a piece of wood. It is assumed that you're not trying to destroy what you're pounding upon. A mallet works the same way as a hammer but is made from rubber, plastic, or something soft that won't accidentally damage whatever you're pounding upon. A mall is an oversized hammer made for destroying whatever you're pounding upon. Mjolnir is the hammer of Thor. It is used as a weapon of war and to sell the Marvel franchise videos and kids toys. yawl ever throw up in Walmart looming over oil based products ? Nope. If you feel the need to throw up, try the bug and plant killing chemicals in the garden department. -- Jeff Liebermann 150 Felker St #D http://www.LearnByDestroying.com Santa Cruz CA 95060 http://802.11junk.com Skype: JeffLiebermann AE6KS 831-336-2558 |
#23
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learn by destroying
On 12/19/2017 11:30 AM, Jeff Liebermann wrote:
On Tue, 19 Dec 2017 03:43:08 -0800 (PST), wrote: What is the difference tween a mallet n a hammer A hammer is made for applying a controlled force to an object such as a nail into a piece of wood. It is assumed that you're not trying to destroy what you're pounding upon. A mallet works the same way as a hammer but is made from rubber, plastic, or something soft that won't accidentally damage whatever you're pounding upon. A mall is an oversized hammer made for destroying whatever you're pounding upon. Mjolnir is the hammer of Thor. It is used as a weapon of war and to sell the Marvel franchise videos and kids toys. yawl ever throw up in Walmart looming over oil based products ? Nope. If you feel the need to throw up, try the bug and plant killing chemicals in the garden department. SpelChek = maul http://www.toolstop.co.uk/components...t/216-10-2.jpg -- Andrew Muzi www.yellowjersey.org/ Open every day since 1 April, 1971 |
#24
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learn by destroying
On 12/19/2017 6:37 AM, AMuzi wrote:
snip Mallets are the tool used in bicycle polo to direct the ball across the goal. https://www.youtube.com/watch?v=8dObcGu_62k I'll have to get a team together. I really enjoyed the November 19, 2017 performance at the Western Band Association Championships by Rancho Verde High School. Much more sensible for the color guard, all dressed as Dorothy from Wizard of Oz, to ride bicycles onto the field rather than walk. https://www.youtube.com/watch?v=3CFeKGXzjlg |
#25
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learn by destroying
On 12/19/2017 12:48 PM, AMuzi wrote:
On 12/19/2017 11:30 AM, Jeff Liebermann wrote: On Tue, 19 Dec 2017 03:43:08 -0800 (PST), wrote: What is the difference tween a mallet n a hammer A hammer is made for applying a controlled force to an object such as a nail into a piece of wood.Â* It is assumed that you're not trying to destroy what you're pounding upon. A mallet works the same way as a hammer but is made from rubber, plastic, or something soft that won't accidentally damage whatever you're pounding upon. A mall is an oversized hammer made for destroying whatever you're pounding upon. Mjolnir is the hammer of Thor.Â* It is used as a weapon of war and to sell the Marvel franchise videos and kids toys. yawl ever throw up in Walmart looming over oil based products ? Nope.Â* If you feel the need to throw up, try the bug and plant killing chemicals in the garden department. SpelChek = maul http://www.toolstop.co.uk/components...t/216-10-2.jpg So a mall is where you might go to buy one? -- - Frank Krygowski |
#26
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learn by destroying
On Tue, 19 Dec 2017 11:48:55 -0600, AMuzi wrote:
On 12/19/2017 11:30 AM, Jeff Liebermann wrote: A mall is an oversized hammer made for destroying whatever you're pounding upon. SpelChek = maul http://www.toolstop.co.uk/components...t/216-10-2.jpg Sorry. I was having a grand mal seizure. Gone to the mall to do some holiday shopping and maybe split some firewood with my maul when I return. -- Jeff Liebermann 150 Felker St #D http://www.LearnByDestroying.com Santa Cruz CA 95060 http://802.11junk.com Skype: JeffLiebermann AE6KS 831-336-2558 |
#27
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learn by destroying
On 12/19/2017 1:38 PM, Jeff Liebermann wrote:
On Tue, 19 Dec 2017 11:48:55 -0600, AMuzi wrote: On 12/19/2017 11:30 AM, Jeff Liebermann wrote: A mall is an oversized hammer made for destroying whatever you're pounding upon. SpelChek = maul http://www.toolstop.co.uk/components...t/216-10-2.jpg Sorry. I was having a grand mal seizure. Gone to the mall to do some holiday shopping and maybe split some firewood with my maul when I return. Buying a maul at the mall for your moll? -- Andrew Muzi www.yellowjersey.org/ Open every day since 1 April, 1971 |
#28
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learn by destroying
On 19/12/2017 2:55 PM, AMuzi wrote:
On 12/19/2017 1:38 PM, Jeff Liebermann wrote: On Tue, 19 Dec 2017 11:48:55 -0600, AMuzi wrote: On 12/19/2017 11:30 AM, Jeff Liebermann wrote: A mall is an oversized hammer made for destroying whatever you're pounding upon. SpelChek = maul http://www.toolstop.co.uk/components...t/216-10-2.jpg Sorry.Â* I was having a grand mal seizure.Â* Gone to the mall to do some holiday shopping and maybe split some firewood with my maul when I return. Buying a maul at the mall for your moll? Don't get mauled by the madding crowds. |
#29
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learn by destroying
On 12/14/2017 5:45 PM, Tim McNamara wrote:
Huh. CFRP rims strike me as a solution looking for a problem, creating new problems along the way. I suspect that I don't have the orginal problem that is trying to be solved (I am not racing the TdF and large sums of money aren't involved in the outcome of any of my bike rides). The exploding rims were kind of cool, though. Holy smokes. That would change change the outlook of your day. But I wonder, in the real world, how likely that would be. Even wiht long descents, it's unusual to have the brakes applied for minutes at a time (unless you don't know what you're doing). Trying to avoid the real work waiting for me, I did the following quick-and-dirty analysis; It's a bit garbled, but you can skip to the last three paragraphs, starting at "Summarize": Bottom line: it's going to be /really/ hard to duplicate this testing abuse on a single fast, short descent. Maybe you could still kill these rims on an extended descent, that's not what the test is checking. ================================================= 1200W braking power: See https://www.bikerumor.com/2017/12/08...im-brake-test/ For me, at 200 lbs full weight bike+rider (91 kg=M), using power = f*v, on a grade of R (as a decimal, e.g. 7%=.07) Descending at velocity v, downward force on bike (neglecting air resistance! and road friction) Downward force is RMg, power is RMgv = R(91*9.8)v watts, with v in m/sec. To get power=1200 (we need braking power to be 1200 W; this happens with downward force = braking force, i.e. constant velocity) Need 890Rv=1200; Rv=1.35. Let's try R=15%; .15v=1.35; v=9 m/sec=20 mph Huh! seems attainable. If the road was straight enough. But of course, to do this for the 184 seconds that killed a Bonty rim in the test (see web link above), that's 184*9m distance = 1.656km, or about a mile, and altitude loss is 15% of that, or 248m or about 820 feet. Summarize: Go down a 15% grade at 20 mph for about a mile (with a 20mph tailwind (!) so there are no aero losses) Do it on good pavement so friction (other than braking, which we are testing) is minimal. This will take about 3 min (check), energy input is Mgh where h=altitude loss = 91kg*9.8m/sec^2*248m = 221kJ in 180 sec, or average power input = 221kJ/180 sec = 1228 W (check, within rounding error) If you brake to hold speed constant (or nearly) for this 1 mile descent, you will have put 1200W into your rims for 3 min. Oh - but that's into *both* rims, so neither gets the full 1200W. Do a one-mile 15% descent at *30* mph with 2/3 of braking power in front rim, with the *30* mph tailwind, that should kill the front rim. Oh, but even this doesn't take into account heat dissipation (top of the rim is going 60 mph and getting some cooling even with the atomic tailwind). Not the point of the test in the web link, but an amusing calculation. Mark J. |
#30
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learn by destroying
On 19/12/2017 4:05 PM, Mark J. wrote:
On 12/14/2017 5:45 PM, Tim McNamara wrote: Huh.Â* CFRP rims strike me as a solution looking for a problem, creating new problems along the way.Â* I suspect that I don't have the orginal problem that is trying to be solved (I am not racing the TdF and large sums of money aren't involved in the outcome of any of my bike rides). The exploding rims were kind of cool, though.Â* Holy smokes.Â* That would change change the outlook of your day.Â* But I wonder, in the real world, how likely that would be.Â* Even wiht long descents, it's unusual to have the brakes applied for minutes at a time (unless you don't know what you're doing). Trying to avoid the real work waiting for me, I did the following quick-and-dirty analysis; It's a bit garbled, but you can skip to the last three paragraphs, starting at "Summarize": Bottom line: it's going to be /really/ hard to duplicate this testing abuse on a single fast, short descent.Â* Maybe you could still kill these rims on an extended descent, that's not what the test is checking. ================================================= 1200W braking power: See https://www.bikerumor.com/2017/12/08...im-brake-test/ For me, at 200 lbs full weight bike+rider (91 kg=M), using power = f*v, on a grade of R (as a decimal, e.g. 7%=.07) Descending at velocity v, downward force on bike (neglecting air resistance! and road friction) Downward force is RMg, power is RMgv = R(91*9.8)v watts, with v in m/sec. To get power=1200 (we need braking power to be 1200 W; this happens with downward force = braking force, i.e. constant velocity) Need 890Rv=1200; Rv=1.35. Let's try R=15%; .15v=1.35; v=9 m/sec=20 mphÂ* Huh! seems attainable.Â* If the road was straight enough. But of course, to do this for the 184 seconds that killed a Bonty rim in the test (see web link above), that's 184*9m distance = 1.656km, or about a mile, and altitude loss is 15% of that, or 248m or about 820 feet. Summarize: Go down a 15% grade at 20 mph for about a mile (with a 20mph tailwind (!) so there are no aero losses)Â* Do it on good pavement so friction (other than braking, which we are testing) is minimal. This will take about 3 min (check), energy input is Mgh where h=altitude loss Just curious but how do you get a 20 mph tail wind on a 15% descent? Â*Â*Â*Â*= 91kg*9.8m/sec^2*248m = 221kJ in 180 sec, Â*Â*Â*Â*or average power input = 221kJ/180 sec = 1228 W (check, within rounding error) If you brake to hold speed constant (or nearly) for this 1 mile descent, you will have put 1200W into your rims for 3 min. Oh - but that's into *both* rims, so neither gets the full 1200W.Â* Do a one-mile 15% descent at *30* mph with 2/3 of braking power in front rim, with the *30* mph tailwind, that should kill the front rim. Oh, but even this doesn't take into account heat dissipation (top of the rim is going 60 mph and getting some cooling even with the atomic tailwind). Not the point of the test in the web link, but an amusing calculation. Mark J. |
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