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- Q141 - Navigation Problems: Near Coastal
180. The propeller on your vessel has a pitch of 22.8 feet. From 0800, 18 April, to 1020, 19 April, you steamed an observed distance of 403.6 miles. If your average RPM was 74, what was the slip?
The observed distance (403.6 miles) was less than the theoretical distance (438.7 miles) calculated from the propeller pitch and RPM, resulting in a positive slip of 8%.
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