STUB TURNOUT TEMPLATE | |||||||||||||||||||||||||||||||
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The Stub Turnout Template will generate an accurate drawing of a stub turnout in many popular scales and gauges. The various settings below may be modified to fit particular prototypes and model hardware. There are also options to control many layout options, such as the position of the switch-stand. | |||||||||||||||||||||||||||||||
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N: Frog Number | F: Frog Angle (Rad) | F = 2 atan(1 / (2 N)) | Fd: Frog Angle (Deg) | Fd = 180 F / pi | |||||||||||||||||||||||||||
R: Radius | Rmax: Maximum Radius | Rmax = (Pa + Pb - 1.5 Gl) / (F - tan(F / 2)) | |||||||||||||||||||||||||||||
Pi: Point of Intersect | Pi = R tan(F / 2) | Pc: Point of Curve | Pc = Pi + Pi cos(F) | ||||||||||||||||||||||||||||
G: Track Gauge | H: Half Gauge | H = G / 2 | |||||||||||||||||||||||||||||
Pa: Point A | Pa = H / tan(F) | Pb: Point B | Pb = H / sin(F) | ||||||||||||||||||||||||||||
Pf: Theor. Pt. of Frog | Pf = Pi + Pa + Pb
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Ph: 1/2" Pt. of Frog | Ph = N cos(F / 2) / 2 / Scale | ||||||||||||||||||||||||||||
Fl: Flangeway | Fg: Frog Gap | Fg = Ph + 2 Fl / tan(F) | Gl: Guard Length | Gl = 2 Fl / tan(F) | |||||||||||||||||||||||||||
Pf3: Pt of Frog Wye & 3-Way | Pf3 = Pi + Pa
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N3: Three Number | N3 = 1 / tan(F3) | ||||||||||||||||||||||||||||
F3: Three Angle (Rad) | F3 = 2 asin(Pf3 / R) | F3d: Three Angle (Deg) | F3d = 180 F3 / pi | ||||||||||||||||||||||||||||
D: Throw Distance | S: Stub Length |
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Click on Image to Download |
LEGEND: Scale: xx pixels per inch, Grid: 1 inch. | TIE COUNT: | Notes:
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© Copyright 2016, 2017 by Russell Shilling