can anyone tell me offhand what the degree angle for a 1.5% grade is?
It’s questionable whether I can do this 51 years after geometry. They may even have discovered that it was all wrong! And I threw away my Math table book years ago, so I can’t look it up readily.
Nonetheless, Wiki says the tangent is “opposite” over “adjacent”, more commonly “y” over “x”. In this case opposite is the vertical rise of 1.5". And adjacent is the horizontal run of 100". So the tangent is 0.015. A zero degree rise has a tangent of zero and a 1.0 degree rise has a tangent of 0.0174. So, interpolate to 0.9xx degrees. I have no idea what you do with that.
If I had a calculator that cost more than $5.99 it would give a more precise answer.
http://en.wikipedia.org/wiki/Trigonometric_functions
I have a brain cramp! Thank goodness you don’t need the sine or cosine, because those involve the hippopotamus, which I can’t spell anymore.
Gidday Dave, Similar to Paul, when I now try to work such things out My Brain Hurts. [banghead].
But he is right…1.57% = 0.9 degrees.
Cheers, the Bear.
Thanx jabear, I’m starting my newest nscale layout, the D&S Southern RR. I’m using spline sub roadbed and after ripping 4 sheets of 1/8’’ Masonite MY brain got clogged with sawdust! I’m going to try to post some photos of my layout progress, and would appreciate constructive criticism.
Just curious, wondering why you need the degree for your slope/ elevations. Don’t know if you’re using a gauge/ instrument to set the elevation. Any calculations needed for the rise for your grade % are easily done by slope = rise over run. Plug in the rise for any particular distance for the set grade gives you the vertical rise.
0.0 % 0.000 in/ft 0.00 deg
0.1 % 0.012 in/ft 0.06 deg
0.2 % 0.024 in/ft 0.11 deg
0.3 % 0.036 in/ft 0.17 deg
0.4 % 0.048 in/ft 0.23 deg
0.5 % 0.060 in/ft 0.29 deg
0.6 % 0.072 in/ft 0.34 deg
0.7 % 0.084 in/ft 0.40 deg
0.8 % 0.096 in/ft 0.46 deg
0.9 % 0.108 in/ft 0.52 deg
1.0 % 0.120 in/ft 0.57 deg
1.1 % 0.132 in/ft 0.63 deg
1.2 % 0.144 in/ft 0.69 deg
1.3 % 0.156 in/ft 0.74 deg
1.4 % 0.168 in/ft 0.80 deg
1.5 % 0.180 in/ft 0.86 deg
1.6 % 0.192 in/ft 0.92 deg
1.7 % 0.204 in/ft 0.97 deg
1.8 % 0.216 in/ft 1.03 deg
1.9 % 0.228 in/ft 1.09 deg
2.0 % 0.240 in/ft 1.15 deg
2.1 % 0.252 in/ft 1.20 deg
2.2 % 0.264 in/ft 1.26 deg
2.3 %&nbs