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  #41  
Old October 10th 18, 11:03 PM posted to rec.bicycles.tech
Frank Krygowski[_4_]
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Posts: 6,341
Default Buy that wheelbuilder a drink!

On 10/10/2018 4:47 PM, wrote:

Frank, If you attempt to stop a moving car you HAVE TO convert the potential energy to force to calculate what sort of FORCE it would take to absorb that potential

energy.

No, Tom, the car does not have potential energy (assuming it's on level
ground as the original photo shows). If it's moving, it has _kinetic_
energy.

And no, Tom, you cannot "convert potential energy to force." Energy and
force are fundamentally different quantities. You're making less sense
than an alchemist trying to convert lead to gold.

I find it odd that you don't know that or that when speaking of ft/lbs you would not assume ft/lb/secs but require someone to hold your hand and give you SI units and perhaps even calculate it out for you...


No, Tom, neither force nor energy are measured in units of ft/lbs. And
no, Tom, in actual physics or engineering calculations, ft/lbs would
NEVER be assumed to be the same as ft/lb/sec ... whatever the hell those
units would be purportedly representing.

One of the most powerful teaching techniques in mechanical engineering
is getting the students to always pay attention to the units of
measurement. Consequently, I and my colleagues always emphasized showing
and properly canceling units in calculations. If the units don't work
out correctly, it's a pretty sure sign you're making calculation mistakes.

Anyone using ft/lb to represent force, or pretending ft/lb/sec = ft/lb,
would probably not pass the course, let alone pass a licensing test to
become a professional engineer.

when it is common sense that a BICYCLE DOES NOT HAVE ENOUGH TRACTION TO DAMAGE A MOVING CAR.


I'm not commenting on the realism of the photo. I'm trying to move
beyond "it's common sense, duh" and instead talk about technical
correctness.


--
- Frank Krygowski
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  #44  
Old October 11th 18, 02:04 AM posted to rec.bicycles.tech
Frank Krygowski[_4_]
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Posts: 6,341
Default Buy that wheelbuilder a drink!

On 10/10/2018 8:33 PM, Sir Ridesalot wrote:
On Wednesday, October 10, 2018 at 6:05:56 PM UTC-4, Frank Krygowski wrote:
On 10/10/2018 4:49 PM, wrote:
On Wednesday, October 10, 2018 at 9:54:37 AM UTC-7, Frank Krygowski wrote:

Well! They put on a little lecture in our building to supposedly explain
their technology. I was too busy to attend, but my colleagues who did
attend came back shaking their heads. The one who was my best friend
there (and who had a PhD in thermodynamics) said "They couldn't even
keep their units of measurement straight!"

To him, that alone was a sure sign the kids were blowing smoke. And sure
enough, after getting a few hundred thousand dollars from local people
with more money than... well, than physics knowledge, the dudes left
town and probably left the country.

And your entire company didn't even know the laws of thermodynamics?


??? What a massive non sequitur!

"My entire company" was the College of Engineering and Technology. And
we did (and do) know the laws of thermodynamics, including the guy I
mentioned with the PhD in thermo. Which is how we knew the dudes were
scam artists.

You're a strange one.

--
- Frank Krygowski


Maybe he's just trolling?


Well, there is that...


--
- Frank Krygowski
  #45  
Old October 22nd 18, 01:22 AM posted to rec.bicycles.tech
N8N[_2_]
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Posts: 28
Default Buy that wheelbuilder a drink!

On Tuesday, September 25, 2018 at 8:06:01 PM UTC-4, AMuzi wrote:
https://i.dailymail.co.uk/1/2018/09/...7819759698.jpg

Nice job!
--
Andrew Muzi
www.yellowjersey.org/
Open every day since 1 April, 1971


Wow, I just dropped by after literally years of absence and I still see familiar names... in any case those look like Velocity Deep-Vs and I can vouch for their strength. Still have a pair on my Cannondale; they replaced the original Gipiemme wheels which had an odd spoke pattern that made trueing, um, problematic. The latter are stored away in case I ever sell the bike but at this point it's probably scrap value although it still rides fine.

nate
  #46  
Old October 22nd 18, 01:26 AM posted to rec.bicycles.tech
AMuzi
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Posts: 9,781
Default Buy that wheelbuilder a drink!

On 10/21/2018 7:22 PM, N8N wrote:
On Tuesday, September 25, 2018 at 8:06:01 PM UTC-4, AMuzi wrote:
https://i.dailymail.co.uk/1/2018/09/...7819759698.jpg

Nice job!


Wow, I just dropped by after literally years of absence and I still see familiar names... in any case those look like Velocity Deep-Vs and I can vouch for their strength. Still have a pair on my Cannondale; they replaced the original Gipiemme wheels which had an odd spoke pattern that made trueing, um, problematic. The latter are stored away in case I ever sell the bike but at this point it's probably scrap value although it still rides fine.



Welcome back! See you on r.a.t. later?

--
Andrew Muzi
www.yellowjersey.org/
Open every day since 1 April, 1971


  #47  
Old October 22nd 18, 01:56 AM posted to rec.bicycles.tech
N8N[_2_]
external usenet poster
 
Posts: 28
Default Buy that wheelbuilder a drink!

On Sunday, October 21, 2018 at 8:26:40 PM UTC-4, AMuzi wrote:
On 10/21/2018 7:22 PM, N8N wrote:
On Tuesday, September 25, 2018 at 8:06:01 PM UTC-4, AMuzi wrote:
https://i.dailymail.co.uk/1/2018/09/...7819759698.jpg

Nice job!


Wow, I just dropped by after literally years of absence and I still see familiar names... in any case those look like Velocity Deep-Vs and I can vouch for their strength. Still have a pair on my Cannondale; they replaced the original Gipiemme wheels which had an odd spoke pattern that made trueing, um, problematic. The latter are stored away in case I ever sell the bike but at this point it's probably scrap value although it still rides fine.



Welcome back! See you on r.a.t. later?

--
Andrew Muzi
www.yellowjersey.org/
Open every day since 1 April, 1971


Hah... maybe.

I have had a lot of, um, life challenges the past few years. I was retrieving some of my tools from my storage locker so hopefully I can fix my car so that it'll stop throwing a CEL. Stopped to pick up some Metro shelving off Craigslist to organize said tools and seller was trueing a wheel off an old Trek MTB in his driveway so we of course ended up chatting I almost grabbed my trueing stand and would have had it in the back of the Heep if I had, but I didn't. I was actually searching here to see if I could determine if the old SON dynohub I have stashed away was 32 or 36 hole but I guess that will wait until I find that box. I was going to pass it onto him if he could use it because I don't need it.

Sadly, I haven't done any kind of real car work other than maintenance in close to 10 years. Same for bikes, my Trek 620 build was the last "real work" I've done.

nate
 




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