|
Hi,
I did a second coast down test today, and I'm having problems with the spreadsheet from the Instructables web page: the air temperature today is a lot different than when I did the first coast down. The only value for this is by altitude, but shouldn't there be one for temperature?
Also, my velocities at the end of the test were considerably lower than last time -- either my tires are very much worse (they are probably better, since they are nearly worn out) or I have a drag in a rear brake (a bearing had to be replaced) -- you can sometimes hear it dragging.
Another part of my problem was that I could not do the test as long as the 70 seconds on 4 out of the 6 coast down tests.
This method is pretty flawed, IMO -- you have to guess at the tire rolling resistance, and the air density bugs me, too.
|