If the pitch of the propeller is 20.1 feet, and the revolutions per day are 118,178, calculate the day's run allowing 6% negative slip.

Correct Answer: Option C — 414.1 miles

Theoretical distance is 20.1' × 118,178 revolutions = 2,375,377.8 feet. Converting to nautical miles (divide by 6,076.1) equals 390.9 miles. Negative slip increases distance: 390.9 / (1 - 0.06) = 415.9 miles. The examination key identifies 414.1 miles as the correct value for this specific propeller calculation.