Model RR Calculations

Calculate Speed
Calculate Grade
Calculate Scale Dimension
Calculate Layout Distance
Calculate TTrak Distance
Complex Layout Distance
Calculate Optimum Car Weight
Ohm's Law
Angled Straight
Curve Geometry
Helix Geometry

Calculate Speed
real-time
Distance inches
feet    
Seconds

          
Speed N     
HO  
O     
Z     

Compute Prototype Speed

Enter Distance (inches or feet) and the time it takes to traverse that distance. Speeds displayed will be the prototype MPH.

Enter the seconds or click Stopwatch twice to calculate the seconds.

After calculating the speed, clear the distance to calculate distance traveled during a time. Useful to calculate the total track footage of a layout or a section.

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Calculate Speed
calculation
Distance inches
feet    
Seconds          
Speed          
Scale N      HO      O       Z
           

Compute Prototype Speed

Enter two values to calculate the third

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Calculate Grade
Rise inch
Run inch
feet
Grade %  
Angle °  

Compute a grade percentage.

Any two values may be entered to obtain the third.
If all 3 are filled the grade will be calculated.

For RUN enter either inches or feet.
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Scale Measure
Scale feet inches centimeters
Z 
N 
HO 
O 
Full    
Miles 
Compute a Scale Dimension.
 
Any given value will be converted into the eqivalent scale measurements.
The value entered is an actual real-world measure, not scale measure.
 
For example:   Xy feet of Y-scale is equivalent to Xz feet of Z-scale.
24 feet of HO ==> 2088 feet of Full-scale or 13 feet of N-scale.
320 feet of Full-scale ==> 2 feet of N-scale or 7.4 feet of O-scale.
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Layout Distance
Length feet
Width feet
Radius    inch  
Additional    feet  
Total feet

Compute a Circular Layout's Track Distance.

Enter the length and width of two sides and the radius of the corners.

Copy the total and paste it into the Scale Dimension above for scale distance.
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TTrak Layout Distance
Track Check for
RED Line
Straights
Corners
Junctions:
Insides:
Totals
mm
Miles

Compute a T-Trak Layout's Track Distance.

Enter the number of each module type (straights as singles).
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Layout Distance - Complex
Distance Number of
Straight A feet
Straight B feet
Straight C feet
Straight D feet
Corner A    inch     
Corner B    inch     
Corner C    inch     
Corner D    inch     
Additional    feet  
Total feet

Compute a Complex Layout's Track Distance.

Enter the lengths and number of straight segments
Also the radius and number of corners.

Copy the total and paste it into the Scale Dimension above for scale distance.
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Optimum Car Weight
(NMRA Guidelines)
Car Length inches
Current Weight ounces
Scale N      HO       O
       
Target Weight ounces
Add Weight ounces
grams  

NMRA has set up guidelines for the weight of individual cars. Use this form to figure out if weight should be added to any cars
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Ohm's Law
Volts (E-Current)
Amps (Impedence)
Ohms (Resistence)
Power (Watt)
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Angled Straight
Length
Degree
Width
Depth

With a straight of length L angled at
D degrees, calculate the width and depth.

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Curve Geometry
Curve 1 Curve 2
Radius
Degree
Width
Depth
Length
Total Width
Total Depth
Total Length

Given a 90° curve of 2 different radii, calculate the width and depth of the curve.

If only Curve 1 is specified, only the bottom of the curve will be calculated.

If the radius of Curve 2 is specified, both segments (making 90°) will be calculated. Only the radius of Curve 2 is needed.

Length is the length of the curved track

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Helix Geometry
Horizontal Values
Radius Circumfrence
Straights Level Run
Vertical Values
Clearance Base
Helix Height Compensated Value
Totals
Grade Rise
Compensated Grade Total Run
# Rings Total Dimensions

Add Straights to turn the helix into an oval.

Clearance can be entered as
1) Distance from one level to the next
2) Distance from floor to the ceiling of a level. Add in the thickness of the base in Base

Compensated Value will calculate the grade adjusted for the curve radius. Enter one of the following values based on the scale:
O: 64
HO:32
N: 17.4
Z: 12.7

Rise is the height from one level to the next.

Level Run is the linear length of one helix level.
Total Run is the linear length of the entire helix.

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