Navigation Problems USCG Question #392 (Set 11)

If the pitch of the propeller is 24.8 feet, and the revolutions per day are 93,373, calculate the day's run allowing 11% positive slip.

Official USCG Answer & Rule Citation

Correct Answer: Option A — 339.0 miles

Theoretical distance is 24.8' × 93,373 revolutions = 2,315,650.4 feet. Converting to nautical miles (divide by 6,076.1) equals 381.1 miles. Applying 11% positive slip (multiply by 0.89) results in 339.2 miles. This calculation confirms 339.0 miles as the correct choice within standard exam tolerances.

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