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Search: Posts Made By: wphamilton
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Forum: Commuting
12-07-19, 06:50 PM
Replies: 27
Views: 430
Posted By wphamilton

It's a good idea, but if he's like me and he...

It's a good idea, but if he's like me and he doesn't want to give up that 5th day of bike commuting, it won't work. My favored commute mode is with my road bike, and I've tried out a lot of...
Forum: Road Cycling
12-07-19, 06:33 PM
Replies: 30
Views: 363
Posted By wphamilton

New wheels, carbon fiber frame, and the latest...

New wheels, carbon fiber frame, and the latest and greatest drive train will buy you close to zero more speed. It would gain some proportional to the fraction of weight saved and grade of incline, on...
12-05-19, 01:28 PM
Replies: 14
Views: 270
Posted By wphamilton

Seems like dropping the chains because of...

Seems like dropping the chains because of cross-chained on the small ring will drop off the outside, between the rings. OP gives me the impression that it's dropped to the inside, which would need a...
12-05-19, 10:04 AM
Replies: 14
Views: 270
Posted By wphamilton

Wouldn't a stiff link or gummed up pulley cause...

Wouldn't a stiff link or gummed up pulley cause that?
12-05-19, 08:34 AM
Replies: 67
Views: 3,425
Posted By wphamilton

They're not particularly great by any stretch but...

They're not particularly great by any stretch but they're awesome compared to what they replaced, especially for the price so I'm a fan. Wheels aren't going to help much objectively anyway, but they...
Forum: Commuting
12-05-19, 08:18 AM
Replies: 27
Views: 430
Posted By wphamilton

I've used a handlebar bag for that, basically a...

I've used a handlebar bag for that, basically a backpack that I rolled up and buckled, and had straps or hooks (depending on which version) that secured it to the handlebars. Prior to that, for...
12-03-19, 07:59 PM
Replies: 179
Views: 8,950
Posted By wphamilton

Jumping the practice green on an off-road 250cc...

Jumping the practice green on an off-road 250cc was my first seriously bad crash when I was a junior in HS. Another time I hit a 2-foot ridge in the middle of the fairway on the ninth, going way too...
12-02-19, 11:25 PM
Replies: 179
Views: 8,950
Posted By wphamilton

I think the trolls would dearly love that,...

I think the trolls would dearly love that, judging from responses on this one.
12-02-19, 12:59 PM
Replies: 179
Views: 8,950
Posted By wphamilton

Take it to the Helmet Thread please.

Take it to the Helmet Thread please.
12-02-19, 09:28 AM
Replies: 179
Views: 8,950
Posted By wphamilton

Rhetorical or serious question?

Rhetorical or serious question?
12-02-19, 08:26 AM
Replies: 179
Views: 8,950
Posted By wphamilton

I want people to realize that I'm speaking from...

I want people to realize that I'm speaking from experience, not theory. I know for an absolute fact - because I've done it many times - that on many crashes you can react, and you can execute...
Forum: Road Cycling
12-01-19, 11:39 AM
Replies: 206
Views: 6,199
Posted By wphamilton

With wireless earbuds I have to stop to make a...

With wireless earbuds I have to stop to make a call because the wind noise is horrible. I think you'll have to go high end for that.
11-27-19, 08:18 AM
Replies: 80
Views: 3,250
Posted By wphamilton

It's easy to see that a rigid, solidly attached...

It's easy to see that a rigid, solidly attached mount could have enough leverage to break the helmet if it hit at the right angle so that's a good policy. Other than that there isn't much impact...
11-25-19, 11:54 PM
Replies: 80
Views: 3,250
Posted By wphamilton

Hey don't advocate for or against helmets in the...

Hey don't advocate for or against helmets in the thread please. Those arguments/opinions are (by site policy) restricted to the Helmet Thread, and you'll get this thread transferred there anyway if...
11-25-19, 03:36 PM
Replies: 80
Views: 3,250
Posted By wphamilton

Personally I intended "fluid" in the general...

Personally I intended "fluid" in the general sense that you mention (except for plasma of course) because I envision some shock absorption due to properties of the fluid flow, which could occur with...
11-25-19, 09:11 AM
Replies: 34
Views: 1,176
Posted By wphamilton

In that the soreness is due to how well our legs...

In that the soreness is due to how well our legs are conditioned for the particular effort, no not due to age.

But yes, it's due to age in part because the older we get, the harder it is and...
11-25-19, 08:56 AM
Replies: 80
Views: 3,250
Posted By wphamilton

No, the degradation due to UV is limited to the...

No, the degradation due to UV is limited to the upper layer and has almost no significance to the mechanical strength.

And even that won't occur unless you remove the plastic cover and scrape off...
11-25-19, 08:51 AM
Replies: 80
Views: 3,250
Posted By wphamilton

Since the thread is already off into the...

Since the thread is already off into the (nonexistent) degradation of helmets due to water, and a couple of more pertinent tangents, it won't hurt to indulge a little more.

It's absolutely true...
Forum: Commuting
11-24-19, 02:41 AM
Replies: 100
Views: 4,516
Posted By wphamilton

I make a point of riding lawfully, but I'm not a...

I make a point of riding lawfully, but I'm not a fanatic about it. Rolling through a stop sign when there's no traffic has zero consequence (including enforcement). There are several other...
11-23-19, 04:47 PM
Replies: 5
Views: 308
Posted By wphamilton

I think his math should be: 1200 watt-hours/60v =...

I think his math should be: 1200 watt-hours/60v = 20 Amps-hours, full discharge in one hour (which is 1C). Leaving out the "hour" is confusing.

I'm not a battery expert by any means, but a...
11-23-19, 11:56 AM
Replies: 80
Views: 3,250
Posted By wphamilton

The studies that I rely on all show insignificant...

The studies that I rely on all show insignificant degradation except near the surface of polystyrene foam, particularly with UV coating. In practical terms, the testing showed that you'd have to...
11-22-19, 10:09 PM
Replies: 80
Views: 3,250
Posted By wphamilton

Yeah the long tail in the back of aero helmets...

Yeah the long tail in the back of aero helmets would be problematic it they hit the ground. I was thinking more simply, of the regular bike helmets, with I believe a smaller cross section facing the...
11-22-19, 07:53 PM
Replies: 80
Views: 3,250
Posted By wphamilton

Who suggested it? I don't see it, and it's kind...

Who suggested it? I don't see it, and it's kind of annoying for you to crap on the thread like this.
11-22-19, 05:14 PM
Replies: 80
Views: 3,250
Posted By wphamilton

I think if someone wanted to wear a motorcycle...

I think if someone wanted to wear a motorcycle helmet, and didn't mind the heat, I for one wouldn't bad-mouth him. I'm not in the least tempted myself however.

I think I saw a photo of some...
11-22-19, 01:35 PM
Replies: 80
Views: 3,250
Posted By wphamilton

The one-time hit and comfort are driving factors...

The one-time hit and comfort are driving factors in design of these foam bike helmets. Also, the anticipated speed is often cited but take that with a grain of salt. I don't know about you, but I am...
11-22-19, 09:00 AM
Replies: 80
Views: 3,250
Posted By wphamilton

It's true that there is a contribution from air...

It's true that there is a contribution from air compression in constrained foam structure, in addition to elastic deflection and buckling of cell walls. You can go as deep as you wish into this...
11-21-19, 05:05 PM
Replies: 80
Views: 3,250
Posted By wphamilton

If you leave styrofoam out in the sun, eventually...

If you leave styrofoam out in the sun, eventually the exposed parts will get brown/yellow and dusty. The dust is surface damage - however much turned to dust is how much the helmet is degraded. One...
11-21-19, 01:23 PM
Replies: 80
Views: 3,250
Posted By wphamilton

Fluids work entirely different from foam...

Fluids work entirely different from foam structures. Rotational forces may be an even more important causal factor in TBI than are linear impacts, and the standard plastic shell makes a slicker...
11-21-19, 12:57 PM
Replies: 80
Views: 3,250
Posted By wphamilton

Geeksplaining not mansplaining. It's just an FYI...

Geeksplaining not mansplaining. It's just an FYI because I'm constantly seeing among other things:

1. Replace your helmet if it's dropped, it might be cracked!
2. Sunlight degraded your helmet...
11-21-19, 12:39 PM
Replies: 28
Views: 841
Posted By wphamilton

When I'm tempted, which happens, I look at...

When I'm tempted, which happens, I look at something like this https://www.amazon.com/Thegreatshopman-Ebike-Electric-Bicycle-Conversion/dp/B07MD7MD9Q and then a cheaper (lower capacity) battery like...
11-21-19, 10:52 AM
Replies: 80
Views: 3,250
Posted By wphamilton

Helmet - Impact

Understanding one basic, core concept of how bike helmets protect us bypasses several mistakes that we hear repeated often. Fortunately it's very simple to grasp and I'll only address this one...
11-21-19, 09:45 AM
Replies: 28
Views: 841
Posted By wphamilton

The question makes sense from the perspective of...

The question makes sense from the perspective of needing something to get around on and how much that costs. Don't forget to factor in the batteries which have to be replaced after enough charge...
11-20-19, 02:47 PM
Replies: 179
Views: 8,950
Posted By wphamilton

You're just fooling with me aren't you? The...

You're just fooling with me aren't you? The forward path is certainly parallel to the flat ground. The vertical path is towards the Earth's center. The resultant velocity - magnitude and direction -...
Forum: Road Cycling
11-20-19, 01:16 PM
Replies: 34
Views: 1,752
Posted By wphamilton

My list of equipment, assuming you're not wearing...

My list of equipment, assuming you're not wearing floppy clothes:


1. Tires first of all since it's the cheapest most effective improvement at all speeds, depending on what you start with

2....
11-20-19, 12:49 PM
Replies: 179
Views: 8,950
Posted By wphamilton

No, as described above there are two components...

No, as described above there are two components to the forces you'll feel. One, the momentum due to the fall. Two, the momentum due to the velocity. The bullet's momentum will result in piercing...
11-20-19, 09:12 AM
Replies: 179
Views: 8,950
Posted By wphamilton

Before it's a completely dead thread, does anyone...

Before it's a completely dead thread, does anyone still disagree with this?

"the added speed is parallel to the ground, and doesn't add anything to the vertical impact of the fall, right? The...
Forum: Commuting
11-20-19, 08:56 AM
Replies: 1,802
Views: 61,206
Posted By wphamilton

Yesterday was my first commute since the time...

Yesterday was my first commute since the time change, and I'd somehow neglected to charge up during the entire 3 weeks off. I actually considered bringing my spare battery pack and thought naw, it'll...
11-20-19, 08:46 AM
Replies: 84
Views: 5,958
Posted By wphamilton

Sitting normally, sitting and relaxing or when I...

Sitting normally, sitting and relaxing or when I first get up, there's probably a range of 30 bpm, so it's hard for me to say. I've seen 50 when sitting in a chair.





I found some...
11-19-19, 06:18 PM
Replies: 179
Views: 8,950
Posted By wphamilton

Well yeah, that would at least be entertaining,...

Well yeah, that would at least be entertaining, and on topic of "crash strategy", What we probably don't want is more sniping from the peanut gallery.
11-19-19, 06:09 PM
Replies: 179
Views: 8,950
Posted By wphamilton

You can laugh at me for even getting into this. ...

You can laugh at me for even getting into this. Nobody here wants a physics lecture from me, least of all me.
11-19-19, 05:07 PM
Replies: 179
Views: 8,950
Posted By wphamilton

That's not even close, sliding or rolling, and at...

That's not even close, sliding or rolling, and at least an order of magnitude off for rolling.







You're getting there, realizing that the "200 mph" part is entirely separate from the...
Forum: Foo
11-19-19, 04:47 PM
Replies: 83
Views: 1,804
Posted By wphamilton

It's known that Turning-complete computation...

It's known that Turning-complete computation models can describe quantum computers, as you imply, but "given enough time" is a little weak as far as the difference goes. Algorithms which cannot be...
Forum: Foo
11-19-19, 02:59 PM
Replies: 83
Views: 1,804
Posted By wphamilton

Since the question itself is speculative, what if...

Since the question itself is speculative, what if there are quantum processes going on in the brain after all? That is purely hypothetical speculation with no direct evidence to support it, but if...
11-19-19, 01:19 PM
Replies: 179
Views: 8,950
Posted By wphamilton

I didn't notice that this was a continuation of...

I didn't notice that this was a continuation of your question, even if phrased belligerently, so I'll answer.

You absolutely need to find or estimate the time it takes to come to a stop, because...
11-19-19, 01:04 PM
Replies: 179
Views: 8,950
Posted By wphamilton

No one has said that. And this will be my last...

No one has said that. And this will be my last comment to you Mr. Maelochs.
11-19-19, 12:39 PM
Replies: 179
Views: 8,950
Posted By wphamilton

Actually you generally do put your hand on the...

Actually you generally do put your hand on the ground. Moreover, a large part of the significance of the hand placement is where it moves your shoulder. Ideally, the palm or back of the hand, the...
11-19-19, 12:11 PM
Replies: 179
Views: 8,950
Posted By wphamilton

Since you won't follow the direction I gave you...

Since you won't follow the direction I gave you in figuring it out (which you asked for), I'll just say that my having actually done it proves that you are incorrect here.

And the bolded part is...
11-19-19, 12:07 PM
Replies: 179
Views: 8,950
Posted By wphamilton

My "belief" comes from my degree in...

My "belief" comes from my degree in Physics.
11-19-19, 11:10 AM
Replies: 179
Views: 8,950
Posted By wphamilton

There's your mistake. The horizontal momentum...

There's your mistake. The horizontal momentum does not go to zero until you stop rolling or sliding. Figure out how long that takes, to derive the horizontal force of impact (ie,from friction or...
11-19-19, 11:07 AM
Replies: 179
Views: 8,950
Posted By wphamilton

I'm not interested really interested in...

I'm not interested really interested in "convincing" people about a physics problem, especially when they're arguing with me. I'll give you the facts, take it or not.

But if you want an easy way...
Showing results 1 to 50 of 1000
 


 
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