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 TB 55-1900-232-10
Example 3-Worksheet
DD 963 @ 7500 LT displacement
What is the maximum speed each Navy tug can achieve?
Solution: Compute hawser tension at 10, 8, 6, 4 knots and plot in Figure G-1
Tow Speed
Tow Resistance
Hawser Resistance
Total Pull Required
10 kts
174,354 lbs
1,100 lbs.
175,454 lbs.
8 kts
116,221 lbs
1,900 lbs
118,121 lbs
6 kts
70,711 lbs
2,500 lbs.
73,211 lbs.
4 kts
37,093 lbs.
3,100 lbs.
40,193 lbs.
The attached Table G-1 work-up shows hawser tensions for the 8- and 10-knot cases.
Plotting a curve on Figure 6-1 provides the following likely maximum tow speeds for each of the tug types
listed, with total hawser average tension.
Max Tow Speeds
Average Tension
T-ATF 166
7.75 kts
113,000
ATS 1
7.4 kts
106,000
ARS 50
7.2 kts
98,000
ATF 76
5 7 kts
68,000
ARS 38
4.4 kts
47,000
G-10
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