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

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:

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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