On 07/05/2016 08:18 AM, Richard Henry wrote:
On Tuesday, July 5, 2016 at 5:56:39 AM UTC-7, pigo wrote:
On Tuesday, July 5, 2016 at 12:52:52 AM UTC-6, Richard Henry
wrote:
I recall discussions here long ago about the difference between
slope angle measurements in degrees and percent. Tonight on
Jeopardy in the combination of a clue and correct response, they
said Talladega race course turns are banked at a maximum of 33
percent. According to NASCAR, the steeper curves are banked at
33 degrees, or about 65 percent.

I remember the original topic. If I remember correctly it had more
to do with blowhards than anything else. But this is RSA
so.........oh well.

But what is 100%? Is a horizontal line 0 and the vertical of a 90
deg. 100%? "per cent" of what? 360? Never gave it much though. I
remember a section of "the peak" at Park City that was supposed to
be 54 deg.(?). It seemed straight down.

It is 100% when the amount of rise (or fall, in the case of skiing)
is the same as the amount moved forward. The angle where that happens
is 45 degrees. There are very few ski slopes that approach that
steepness because snow generally won't stay on it.

The mathematical formula is 100 * tan(angle) -- the tangent of the
angle multiplied by 100 to convert to percent.

Or, for the mathematically-challenged, multiply or divide by 2.

--
Cheers, Bev
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