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# Sheldon Brown/Harris Cyclery site

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# Sheldon Brown/Harris Cyclery site

12-05-23, 01:59 AM
#76
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Originally Posted by icemilkcoffee
You are tying yourself in knots trying to 'prove' Sheldon Brown wrong.
He was proven wrong on this point by NASA, in 1963. No knots are required, y'all just need to learn to read.

You neglected to address the fact that your calculated speed is about half of the level-ground bicycle speed record -- again proving that Brown was entirely wrong.

Originally Posted by icemilkcoffee
OK. So let's try 25psi on a MTB. Sqrt of 25 = 5. 5 X 10.2 = 51mph. Yeah. Good luck pedaling your MTB to 51mph!
So apparently you are completely dense.

Now ride down a hill.

And again, for those remedial readers in the audience, that is the speed of complete hydroplaning, of both wheels. The huge majority of riders will not remain upright long enough for the heavily-loaded rear to plane, so the effective speed is lower.

Last edited by TC1; 12-05-23 at 02:02 AM.

12-05-23, 06:08 AM
#77
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Originally Posted by TC1
Are you completely dense?

First of all, the record speed on a bicycle exceeds 92 mph
I'm guessing the road was dry. Who in their right mind would attempt this kind of thing on a wet road?

12-05-23, 06:25 AM
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Originally Posted by TC1
Are you completely dense?

First of all, the record speed on a bicycle exceeds 92 mph, so your attempted proof failed miserably -- recall that the claim you are defending is that hydroplaning a bicycle is "absolutely impossible" in Brown's words.

More to the point, see if you can manage the arithmetic for lower pressures.
This is silly.

Originally Posted by TC1

You neglected to address the fact that your calculated speed is about half of the level-ground bicycle speed record -- again proving that Brown was entirely wrong.
Still silly.

Originally Posted by TC1
Hell, even the Sheldon Brown site agrees with me in-part. It contains the very formula for calculating the hydroplane speed, and then contradicts itself by claiming hydroplaning is impossible.

Last edited by njkayaker; 12-05-23 at 06:42 AM.

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12-05-23, 06:47 AM
#79
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Originally Posted by TC1
What license is required to point out that people are venerating a reference with numerous embarrassing errors? Are you suggesting that fake news is beyond challenge?
It’s pretty weird you think he was serious.
Of course, you don’t need a license to be silly. Though, I suspect there are a number of people who wish you did.

Last edited by njkayaker; 12-05-23 at 07:12 AM.

12-05-23, 06:49 AM
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Originally Posted by TC1
Or, if you ride like these folks:

Among many, many others who didn't have a camera pointed at them.
These people were going 92 mph? Or even 50 mph?

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12-05-23, 07:45 AM
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Originally Posted by njkayaker
These people were going 92 mph? Or even 50 mph?
The rule is apparently that they are hydroplaning if (i) they're riding at a speed equal to or greater than that predicted by the NASA formula or (ii) they're riding at any other speed.

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12-05-23, 07:54 AM
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Again. It's the pressure UNDER the tire, not the pressure in the tire that does the lifting.

Again. It's is the difference between loss of traction (common) and the riding a pressure wave sufficient to lift the craft/vehicle/wheel/whatever.

Again. In the normal conditions of riding a bicycle the conditions to ride a pressure wave to lift the bicycle to ride on the surface of the water are not met. Ie "impossible"

Here is a hydroplaning event:

Here is a similar demonstration of planing upon the hydro:

If you can show a video of a bicycle, doing a thing similar to the above successfully, I will yield the position and proclaim the mighty Sheldon wrong.

TC1 Have you considered putting us all on ignore? Every single last one of us. Please.
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I shouldn't have to "make myself more visible;" Drivers should just stop running people over.

Car dependency is a tax.

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12-05-23, 08:00 AM
#83
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Enough of this silly back and forth bickering.

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