grade

Discussion in 'Getting Started' started by Sparks, Jun 27, 2002.

  1. Sparks

    Sparks New Member

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    I just started a spur that rises 2 3/4" in 3 feet. Whats the grade on it. Ho scale
  2. rockislandmike

    rockislandmike Active Member

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    7.6% ( 2.75 / 36 ) . . . . . . . . .
  3. Sparks

    Sparks New Member

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    Is that alot. I have a Mantua 0-6-0 pulling the grade with two three inch cars. It still has a lot of power left to.
  4. Tyson Rayles

    Tyson Rayles Active Member

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    Yes Sparks it is alot, but if the engines you have will pull the amount of cars you want them to up the grade and you like it that's really all that counts. In real life usually only logging or mining railroads would normally have grades that steep. Most model railroads try to stay at 4% or less for ease and reliablity of operation (2.5% is the preffered choice of a lot). The way to figure the grade is 1" in 100" is 1%, so a 1" in 50" rise is 2%. The scale doesn't matter as a grade is a grade. Hope this helps to shed some light on the matter! :)
  5. Sparks

    Sparks New Member

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    This is a spur that is going to a mine some day It will run the little six 0-6-0 with 3 3" long d&rgw hopper cars. Which I have to find the hopper cars.
  6. billk

    billk Active Member

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    Sparks - You should be OK, then, if your spur is not too long. Even in the prototype, when it comes to spurs, it's pretty much "whatever it takes to get there". Moving a few cars up a 7% spur is nothing compared to hauling 40-50 cars up a 4% mainline!
  7. rockislandmike

    rockislandmike Active Member

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    Hey Sparks, did a quick search for ya - looks like Stewart Hobbies and Walthers both make D&RGW coal hoppers.
  8. gromit

    gromit New Member

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    Grade vs. angles

    So a 100% grade would be straight up and down? 50% grade a 45 degree angle? 4% grade would be a 3.6 degree angle?

    When I build my first railroad, it's going to have a loop in it. Just like my hot wheels set when I was a kid.
  9. Tyson Rayles

    Tyson Rayles Active Member

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    No gromit, a 100% grade would have a rise of 100 inches over a length of 100 inches. Don't know what the angle would be, to tired right now to figure it out maybe someone else here will.
  10. rockislandmike

    rockislandmike Active Member

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    Hhhmmm....I wonder how you'd calculate the grade on that ????

    PS - a 45-degree angle is 100% (5rise/5run) . . . . . a 90-degree angle would be undefined (5rise/0run). I'd check your 3.6-degree, but that would require me doing some geometry, which it's too hot to do today (my max temp for attempting geometry is 30Celsius).
  11. billk

    billk Active Member

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    Actually, 90 degrees is an infinite grade (5 / 0 = infinity). Philosophically, that is.
    I think 3.6 degrees is 2.06% (sine of 3.6, right?)
  12. 60103

    60103 Pooh Bah

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    Upper School Trigonometry

    Actually we're talking Tangent here.
    For reasonable grades, Tan and Sin are indistinguishable (i.e. the difference is less than my carpentry) but by 90degrees, sin is 1 but tan is undefined (a.k.a. infinity).
  13. billk

    billk Active Member

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  14. Gary Pfeil

    Gary Pfeil Active Member

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    Math am not my strong smuit. (from Howard Stern show)

    Gary