Re: grades steeper than 20%

["Michelle Rowe" <michrowe@frontier.net>]

I just looked this up for my brother a few days ago.

20% grade = 20 inches of rise over 100 inches of distance, which  is also
equal to a 20 foot rise over 100 feet of distance.  Basically it's just good
old rise/distance.

So 100% grade is a 45 degree angle from horizontal (rise and distance are
equal).

m
----- Original Message -----
From: <guest@endurance.net>
To: <ridecamp@endurance.net>
Sent: Saturday, August 21, 1999 1:53 PM
Subject: RC: grades steeper than 20%


> Barb Peck bpeck@together.net
> Barb Peck
> bpeck@together.net
>
> RE: grades steeper than 20%
>
> I've always wondered how the steepness is "graded".
>
> The highways thru the White Mtns in New Hampshire and some of the
> highways in Colorado, have signs stating what the % grade is.
>
> A 15% grade is a burn-your-brakes-out-downhill-nightmare.
>
> I can only imagine how steep 20% is.... I imagine some skii-trails
> to be >20%.
>
> Anybody out there know how to convert %grade into an angle???
> (like what % grade is about the same as a 45 degree slope(angle))
>
> Sombody's gotta know this!
>
> Barb
>
>
>
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