Hi Gene;
One method that should work on a plan or drawing would
be to calculate the required distance - 5 inch height
at 2% grade (rise of 2 inches in 100 inches run) is
250 inches or 21 feet (rounding up). Say your drawing
is being done at 1/2 inch to the foot scale, cut a
piece of heavy thread or soft wire 10 1/2 inches long.
That is your "grade". You can now lay it on your plan
to find the start and ending point of the grade,
including curves or straight runs as required. Once
you have it "right", make pencil marks along the
thread and then connect them.
Pieter Roos
--- ecphora123 <[EMAIL PROTECTED]> wrote:
> A 2% grade (or any other percentage)is easily
> measured and
> constructed in a straight track situation, but just
> how does one
> accomplish the same on a curve? Does one mark a
> length of flixible
> track prior to bending it to the desired curvature,
> knowing that
> various marked points must be at some elevation
> which complies with
> the 2% increase? I suppose that this works if you
> are actually
> constucting a layout, but how do you draw a track
> plan for a 2% grade
> on a curve, knowing that each point on the curve is
> at a 2% increase?
>
> Now, if you are still with me, how much higher must
> a track or tracks
> be in order to cross over other tracks. A friend who
> insists for what
> ever reason (must need some sort of professional
> intervention L.O.L.)
> on modeling in HO tells me that he uses a 4 1/2
> inches minimum for
> his clearance. What is the accepted minimum vertical
> clearance for S?
> How do you plan grades on paper so that a bridge at
> a specific place
> on the layout will be high enough over other tracks?
> This is
> especially important if you are pre-planning scenes
> for their visual
> impact. Again, a curved or straight grade would make
> such planning on
> paper essential.
>
> Thanks to all,
>
> Gene Cimino
>
>
>
>
>
>
>
> Yahoo! Groups Links
>
>
> [EMAIL PROTECTED]
>
>
>
>
>
Pieter E. Roos
Railroad Home Page at
www.geocities.com/pieter_roos/pieter_1.html
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