MIL-HDBK-1005/6
Table 1
Design Procedure
Transition
(1)
Radius and length of any arc
Figure 8
(flexible)
curve
Rn = Gs + radius of corresponding arc of
inner curve
(2)
Distance shifted back of the S.C.T. along
Figure 8
tangent ts is:
Par. 3.10
Gs & Gmin
d'
sin 2a
Figure 8
(3)
Tangent length between end of switch curve and
Par. 3.10
beginning of flexible curve, and its offset
distances in the W and Z directions are:
t1 = ts - d
W direction = t1 cos 3E 49' 11"
Z direction = t1 sin 3E 49' 11"
(4)
Tangent length between end of flexible curve and
main circular curve, and its offset distances in
the W and Z directions are:
Gs & Gmin
t'
tan 2a
W direction = t cos 2
Z direction = t sin 2
(5)
The coordinates for any P.C.C. are:
Wn = Wn-1 + Rn (sin 2n - sin 2n-1)
Zn = Zn-1 + Rn (cos 2n-1 - cos 2n)
(6)
The gage at any P.C.C. of the transition
curve, back of Rmin is:
Gn = Gs - d sin (2n - 2s)
49
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