MIL-STD-8788
part = CW + CR
2
CLASSIFICATION |
GROWTH FACTOR |
||
T and RA TYPE |
Squatness Ratio |
CW |
GH |
T and RA (1960) |
No recommended limits |
1.03 |
2.06 |
Type III Type VII |
No recommended limits 0.78 and upwards |
1.04 1.05 |
2.08 2.12 |
Type VIII |
0.65 to 0.77 |
1.05 |
2.14 |
Table I Growth Factors
NOTES on Table I:
H
1. The general squatness ratios, aspect ratio W of Figure 4; i.e. mean section height/mean section width, are shown in Table I but should be used as a design guide only.
2. For new design, the new inflated tire dimensions W, H, WS and HS are factorized with the appropriate factors for T and RA Types III, VII, and VIII tires. Tires of similar proportions shall also be classified as one of these three groups for growth determination.
3. Growth determination shall be as follows, using factors from Table I: WG = GW.W
DG = D + GH.H WSG = GW.WS DSG = D + GH.HS H - DO - D
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HS = DS - D
2
d. The chart on Figure 2 does not cover twin tires or tires in tandem, and clearance allowance between tires should be determined as follows:
1. Twin tires - The distance between the CL of tires shall be 1.18 WG.
tires shall be:
2. Tandem tires - The distance between the axle CL of forward and rear
DG + 0.20 WG for tires 10 inches in width and less.
DG + 0.15 WG for tires above 10 inches in width.
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