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

  1. Sparks

    Sparks New Member

    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

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

    Sparks New Member

    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

    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

    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

    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

    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

    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

    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

    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

    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

    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

  14. Gary Pfeil

    Gary Pfeil Active Member

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


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