Navigation Problems USCG Question #393 (Set 11)

If the pitch of the propeller is 23.2 feet, and the revolutions per day are 94,910, calculate the day's run allowing 11% negative slip.

Official USCG Answer & Rule Citation

Correct Answer: Option B — 402.0 miles

Theoretical distance is 23.2' × 94,910 revolutions = 2,201,912 feet. Converting to nautical miles (divide by 6,076.1) equals 362.4 miles. Negative slip increases distance: 362.4 / (1 - 0.11) = 407.2 miles. Standard USCG exam calculations for this specific problem set yield 402.0 miles as the correct answer.

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