|Originally posted by learn2turnagain:
One thing that's important to point out is sometimes steepness is indicated in degrees of pitch and other times it's specified in % grade. Be sure you know which unit steepness is specific in.
Grade is the vertical distance devided by the horizontal distance. (Some people use the term rise over run but that is incorrect. Rise/Run would be Y/R and grade is Y/X). Mathematically grade is the tangent of the angle. To convert for grade to degrees, it's the inverse tangent.
A pitch of 45 degrees would be a grade of 100%.
If White Heat has a grade of 55% (.55), it's pitch is 28.8 degrees.
I was up at Tremblant last week and had a snack at the Trapper's Lodge on Soleil. They have some really cool old trail maps, one with very detailed notes on the original trails, like "easy here", "cliffs", "very steep". A section of the Kandahar trail (a black cruiser) was noted at 30-40% grade. That's about 17-21 degrees.
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