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Search: Posts Made By: RChung
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02-19-23, 02:23 PM
Replies: 341
Views: 15,332
Posted By RChung

I've been fortunate to have worked with a handful...

I've been fortunate to have worked with a handful of riders attempting the hour record. The first time I did that, we collected the weather reports for the same period of the year from previous years...
02-19-23, 02:07 PM
Replies: 341
Views: 15,332
Posted By RChung

The test of a model is how well it predicts the...

The test of a model is how well it predicts the data you are going to see but the purpose of models is help us ask new questions and generate new theories.

The way I estimate CdA and Crr was a...
02-19-23, 10:31 AM
Replies: 341
Views: 15,332
Posted By RChung

Functionally. I think statistical inference in...

Functionally. I think statistical inference in this kind of situation, where we were more interested in a practical result than testing a hypothesis, is sometimes overkill. The power meters were...
02-18-23, 10:27 PM
Replies: 341
Views: 15,332
Posted By RChung

Back in 2011 I worked a little bit on modeling...

Back in 2011 I worked a little bit on modeling the team pursuit in prep for the 2012 Olympics. (For oddball reasons we worked with the American and Canadian women's pursuit teams). One of the tricky...
02-16-23, 08:19 PM
Replies: 341
Views: 15,332
Posted By RChung

What if you ride a tricycle?

What if you ride a tricycle?
02-16-23, 10:10 AM
Replies: 341
Views: 15,332
Posted By RChung

This is the General Forum, not the racing forum,...

This is the General Forum, not the racing forum, but racing isn't steady state: it's a series of punctuated equilibria, where the punctuations are crises that you either survive or you get dropped....
02-15-23, 02:14 PM
Replies: 341
Views: 15,332
Posted By RChung

The people operating those slide rules were...

The people operating those slide rules were engineers and physicists.
02-14-23, 12:59 PM
Replies: 341
Views: 15,332
Posted By RChung

My condolences to all your family and friends.

My condolences to all your family and friends.
02-14-23, 12:46 PM
Replies: 341
Views: 15,332
Posted By RChung

My brother was trained as an engineer. He once...

My brother was trained as an engineer. He once declared, "The difference between engineers and physicists is that engineers think an equation is an approximation of reality and physicists think...
02-14-23, 12:09 PM
Replies: 341
Views: 15,332
Posted By RChung

Um, I 've done that.

Um, I 've done that.
02-14-23, 09:44 AM
Replies: 341
Views: 15,332
Posted By RChung

Most of this thread is about the demand for power...

Most of this thread is about the demand for power imposed by different wheels. That's a physics problem. You've introduced something about the supply of power, which is a physiology problem. The...
02-12-23, 04:16 PM
Replies: 341
Views: 15,332
Posted By RChung

Well, their model allows you to calculate the...

Well, their model allows you to calculate the change in KE as frequently as the data allow but in their particular experiment, they knew they weren't using the brakes during the middle of their test...
02-12-23, 09:39 AM
Replies: 341
Views: 15,332
Posted By RChung

Um, no, look at equation 12. They do estimate the...

Um, no, look at equation 12. They do estimate the loss and gain of KE. The variable "I" captures the moment of inertia of the wheels.


That's true, their model doesn't account for braking -- but...
02-06-23, 07:06 PM
Replies: 341
Views: 15,332
Posted By RChung

Sometimes threads slow down and you think...

Sometimes threads slow down and you think everything that could be said has been said and then boom! they start up again.
02-04-23, 02:08 PM
Replies: 341
Views: 15,332
Posted By RChung

Yup. Even for steep gradients, small improvements...

Yup. Even for steep gradients, small improvements in Crr can be "worth" several hundred grams in mass. That means if you regularly climb OLH or Tunitas Creek, you really want the right...
02-04-23, 12:46 PM
Replies: 341
Views: 15,332
Posted By RChung

If you climb and are a weight weenie, you...

If you climb and are a weight weenie, you absolutely should also be a Crr weenie. Even on pretty steep climbs, small improvements in Crr can trump fair-sized decreases in weight.
Showing results 1 to 16 of 16


 
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