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# How steep is: - Page 2

I measured it two seasons ago with an inclinometer. The spot was about a third of the way down near the lone tree and above where the run becomes a gully. This was one of the steepest sustained sections from what I could tell. Unfortunately, I did not write the measurement down like I usually do but can tell you it was one of the steepest slopes I measured in Summit County. As a comparison, I measured a very small section of Vail's Steep and Deep that came in at 42 degrees, Beaver Creek's steepest section of Golden Eagle at 40 degrees and Loveland's steepest sections of Avalanche Bowl and Zoom at 38-40 degrees. The best I can recall, this section of Pali was around 43 degrees it may have been more??? But it was definitely above 40 degrees.

I agree with mdf's criteria. FWIF, I try to find and measure the steepest sustained section of any particular run where it is at least three connected short radius turns in length (about 50 feet, the measurement at Vail was being generous). I then lay my ski pole on the slope being careful that it is representative of and parallel to that section of the slope and then place my inclinometer on the pole. It is a pretty accurate and easy method. My inclinometer is an angle finder that I bought at Home Depot for \$6.00.

Quote:
 Originally Posted by Cirquerider A 45 degree slope is a 100% slope. (100/100)*100) =100% x INV TAN =45 degrees
Come on this is basic geometry. If a 45° slope is = to 100% slope, then what is a 67.5° slope...150%???? what is a 90° (a vertical plane) --200%???....I think not.

A 45° slope (a 1:1 pitch) is 50% Half of a 90° slope. A 90° is a 100% slope.
Quote:
 Originally Posted by Ferniefreeheels Come on this is basic geometry. If a 45° slope is = to 100% slope, then what is a 67.5° slope...150%???? what is a 90° (a vertical plane) --200%???....I think not. A 45° slope (a 1:1 pitch) is 50% Half of a 90° slope. A 90° is a 100% slope.
Ferniefreeheels, you make a very common mistake by those that do not understand the meaning of percent grade in equating that term to angle degrees. Quite a lot of bs numbers have even showed up in credible magazines over the years mixing up the terms. 100% grade equals a 45 degree slope and is a civil engineering term you can easily look up in a dictionary or search for on the net with "percent grade define". Also if you have a knack for math you might take a look at the link in my above post that goes into more details. ---dave
If I'm wrong, I'm wrong. I've always been under the impression flat level ground is 0° slope or 0% grade and a 90° slope (totally vertical) is 100° slope or a 100% grade.

So if 45°slope is= to a 100% grade, then if you have a 50° slope what would it be in a percentage grade?
Most common definition of slope from basic math is rise over run, change in x divided by change in Y. For a 50 degree slope, rise is the sine of 50 degrees, run is the cosine of 50 degrees, and the slope is sin(50)/cos(50) or tangent of 50 degrees = 1.19 = 119 percent.
Quote:
 Originally Posted by Ferniefreeheels If I'm wrong, I'm wrong. I've always been under the impression flat level ground is 0% slope and a 90° slope (total vertical) is 100% slope. So if 45% is= to a 100% slope, then if you have a 50° slope what would it be in a percentage?
Sorry, but you're wrong. 50 Deg slope is 119.2% slope...

http://forums.epicski.com/showpost.p...15&postcount=6
I've never talked to a single avy professional or bc skier (people to whom slope angle is very importatnt) who uses the % rating or all the complicated equations, graphs and ski pole geometry that's been discussed in this thread. Every single one of them just uses a simple old inclinometer. Really, you guys are making this way way way way way more complicated than it needs to be.
Cornbreads' way is very simple. Cheap, easy and simple. Nice photo illustration as well.
You guys are too Funny. Did we all forget 6th Grade math already ??

Slope = Rise / Run .. so If a mountain is 1000ft vertical and from the center of the summit it goes OUT 1000 ft to the base that's a ratio of 1:1 or 1000ft/1000ft = 1.0 or 100% Grade. Pretty simple..

The Angle is a different calculation:

did you all forget SOHCAHTOA?? sin x = opp/adj cos x =adj/hyp

don't get them confused...

stay in school... lol
Quote:
 Originally Posted by Noodler
Some problem with things like Blow Hole at Blackcomb. They have it at 40 degrees...but which part is 40 degrees?

As you go further along the entrance to skier's right it increases to what I'm sure is well over 60 degrees (at the furthest point right).

...and if you average it out including run-out, well, you actually go uphill to exit, so that would bring down the average, no?
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