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THEMA: CRITICAL SLOPE=? Degrees(°) vs Percents(%)
THEMA: CRITICAL SLOPE=? Degrees(°) vs Percents(%)
Vadim - 09.10.09 15:45
Topic: CRITICAL SLOPE=? Degrees(°) vs Percents(%)
Who think about "which is the relations between Degrees and Percents of slope? "
I mean this approximation is true at small angles:
:
PERCENT = (Pi/2)*(100%/90deg) * DEG = 1.74*DEG
For example : 4 % slope = 2.3 deg. slope.
Is it right?
But what is recommended maximum angle for trains at layouts ?
Have you ever thought about it?
I remember, that someone recommends on forumes that this value must be equal about "2" but in DEGREES or in PERCENTS?
Namely, Is it 2 degrees or is it 2%?
It is different things, and It is critical to do a mistake!!!
---
Vadim
Who think about "which is the relations between Degrees and Percents of slope? "
I mean this approximation is true at small angles:
:
PERCENT = (Pi/2)*(100%/90deg) * DEG = 1.74*DEG
For example : 4 % slope = 2.3 deg. slope.
Is it right?
But what is recommended maximum angle for trains at layouts ?
Have you ever thought about it?
I remember, that someone recommends on forumes that this value must be equal about "2" but in DEGREES or in PERCENTS?
Namely, Is it 2 degrees or is it 2%?
It is different things, and It is critical to do a mistake!!!
---
Vadim
Hello Vadim,
as far as I know a maximum of 2% is recommended, especially if it is supposed to look realistic. I'm working with a maximum of 2%.
I guess as long as the trains aren't too long (let's say american road train dimensions...) steeper grades (slopes) should be possible as well.
I hope this helps,
Jan
as far as I know a maximum of 2% is recommended, especially if it is supposed to look realistic. I'm working with a maximum of 2%.
I guess as long as the trains aren't too long (let's say american road train dimensions...) steeper grades (slopes) should be possible as well.
I hope this helps,
Jan
Thanks, Jan.
But which smallest radius recommended for good running trains without derailments?
And which smallest radius seems to be realistic?
---
Vadim
But which smallest radius recommended for good running trains without derailments?
And which smallest radius seems to be realistic?
---
Vadim
Dear Vadim,
the formula is wrong.
Persent means X m high per 100m way.
2% = 2 / 100 = 0,02 or
4% = 4 / 100 = 0,04.
And now you need the tan-1. (I mean the invert-tangent)
deg = tan-1(0,02) = 1,14
deg = tan-1(0,04) = 2,29
Best regards
Frank L.
the formula is wrong.
Persent means X m high per 100m way.
2% = 2 / 100 = 0,02 or
4% = 4 / 100 = 0,04.
And now you need the tan-1. (I mean the invert-tangent)
deg = tan-1(0,02) = 1,14
deg = tan-1(0,04) = 2,29
Best regards
Frank L.
Well Frank,
you just verified that this approximation is usable, although I don't know why you would need it ...
Cheers, Thomas
you just verified that this approximation is usable, although I don't know why you would need it ...
Cheers, Thomas
Giving Your result from atangences and dividing it we obtain almost the same proportional coeficient, which i got:
2% / 1.14 = 1.754
Yes, it's only approximation.
---
Vadim
2% / 1.14 = 1.754
Yes, it's only approximation.
---
Vadim
Hello Thomas, hello Vadim,
Oh... sorry
I have understand... ups
Frank L.
Oh... sorry
I have understand... ups
Frank L.
All Ok. Dont worry.
I also had but a more serious mistake:
Initially i payed small attention to NMRA and believed that max. slope must be 2 deg but not 2%.
Now i m fully remaking my layout....
----
Vadim.
I also had but a more serious mistake:
Initially i payed small attention to NMRA and believed that max. slope must be 2 deg but not 2%.
Now i m fully remaking my layout....
----
Vadim.
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