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## Slope on the Manitou Incline, huh?

Colorado 13er peak questions, condition requests and other info. 13er Trip Reports, Condition Reports
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Joined: Wed Sep 05, 2007 9:48 am

### Slope on the Manitou Incline, huh?

I'm missing something...in a big way.

The Manitou Incline has an average grade of 41% and a max of 68% (http://www.inclineclub.com/incline/), doesn't that calculate out to: an average slope of 36.9 degrees and a max slope of 61.2 degrees?

Yet I think everyone would agree that the Incline is nothing close to that and is merely a (quad and lung busting) class 2 hike. So, what am I missing here?

Am I thinking of % grade wrong?
Isn't 100% grade, vertical and 90 degrees, vertical? And therefore: (percent grade/100) X 90 degrees = slope in degrees?
"Everywhere is within walking distance if you have the time."
- Steven Wright

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Joined: Mon May 08, 2006 7:54 am
Location: Littleton, CO

### Re: Slope on the Manitou Incline, huh?

Isn't 100% grade, vertical and 90 degrees, vertical? And therefore: (percent grade/100) X 90 degrees = slope in degrees?

No, precent of grade is rise to run or amount of vertical gain over a given distance. Therefore 100% grade is 100' of vertical to 100' of horizonal. 100' / 100' * 100 = 100%. 100% grade is 45 degrees. At 41% that about 22.29 degrees. and 67% is 33.82 degrees.
Last edited by JayMiller on Thu Aug 07, 2008 1:41 pm, edited 1 time in total.
My Philosophy on Life: If you wake up alive and well ... Shut the heck up.

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Joined: Tue Dec 26, 2006 11:07 pm
Location: Highlands Ranch, CO

### Re: Slope on the Manitou Incline, huh?

You have to take the arc tangent of the decimal format of the grade to get the degree slope.
0Â° 0%
10Â° 18%
20Â° 36%
30Â° 58%
40Â° 84%
45Â° 100%
50Â° 119%
60Â° 173%
70Â° 275%

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Joined: Tue Dec 20, 2005 9:18 am
Location: Monument, CO

### Re: Slope on the Manitou Incline, huh?

Your math is wrong, as you might have guessed.

The grade is the amount of "up" you have compared to the amount of "forward" you have. A grade of 41% says that for every 100ft. forward, you go up 41ft.

If you bring out your trig from high school, you'll know that you have to take the atan of the grade percentage to get the degrees. So a 68% grade is a 34.2 degree angle.

Vertical would be an infinite grade. A grade of 100% would be 45 degrees.

Posts: 677
Joined: Tue Dec 26, 2006 11:07 pm
Location: Highlands Ranch, CO

### Re: Slope on the Manitou Incline, huh?

41% = 20.3 degrees
68% = 34.2 degrees

Posts: 562
Joined: Mon May 08, 2006 7:54 am
Location: Littleton, CO

### Re: Slope on the Manitou Incline, huh?

Here's a web site that takes all of the effort out.

http://www.csgnetwork.com/righttricalc.html
My Philosophy on Life: If you wake up alive and well ... Shut the heck up.

Posts: 912
Joined: Wed Sep 05, 2007 9:48 am

### Re: Slope on the Manitou Incline, huh?

Wow...does everyone know this but me?
(believe it or not, I was a math major in college)

Thanks everyone...I feel infinitely smarter now
"Everywhere is within walking distance if you have the time."
- Steven Wright

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Joined: Mon May 23, 2005 6:44 am

### Re: Slope on the Manitou Incline, huh?

If you simply get more precise with the measurements I'm sure you could honestly report that the incline is dead vertical or perhaps even slightly overhanging at its steepest portion. Measure the downhill-facing side of one of the ties...

Or better yet, measure the curvature of the uphill inside of one of the cut-open drainage pipes that run across it. Then you could even say it is severely overhanging...

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Joined: Thu Jun 28, 2007 9:00 pm

### Re: Slope on the Manitou Incline, huh?

I don't know and really don't care of the grade....all I know is it is a freaking workout. Thanks to Trianything and COmedic04 for making me look bad on that one yesterday. Once again, thanks Rachel for the invite, I did have fun.
There is a fine line between fishing and just standing on the shore like an idiot.

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