Re: Extensive article on Rivendell and Grant Petersen

On Wed, 25 Sep 2024 15:38:58 -0400, Frank Krygowski
<frkrygow@sbcglobal.net> wrote:

On 9/25/2024 2:09 PM, Jeff Liebermann wrote:

 
You can measure acceleration (or deceleration) using a smartphone:
<https://play.google.com/store/search?q=accelerometer&c=apps>
Measurements are always useful as a sanity check.

>
Good point. He could measure his deceleration, and give us a screen shot
to prove it was well over one "gee." But we'd have to trust that he
wouldn't fake the exercise!
>

I believe that you'll find that the acceleration (or deceleration) is
not constant and varies substantially.  To properly compare calculated
and measured AVERAGE acceleration, you'll need to collect some data
and crunch the numbers.

Right. That's why I pointed out that he'd need to immediately and
precisely reach and maintain absolute maximum deceleration. Any
deviation - like taking half a second to get the braking precisely right
- would add to his stopping distance.

Nonsense. I'm talking about knowing that I need to stop and having my
fingers already putting pressure on the brake levers.

--
C'est bon
Soloman