Question 25Navigation Problems

The correct answer is A) -17.5%. To calculate the slip, we can use the formula: Slip = (Theoretical Speed - Actual Speed) / Theoretical Speed x 100. The theoretical speed is calculated using the propeller diameter, pitch, and RPM: Theoretical Speed = (Propeller Diameter x Pitch x RPM) / (33,000 x 60). Plugging in the given values, we get a theoretical speed of 510.8 miles in 24 hours. The actual speed is 510 miles in 24 hours, so the slip is (510.8 - 510) / 510.8 x 100 = -17.5%. The other options are incorrect because they do not match the calculated slip of -17.5%. Option B) +17.5% is the opposite of the correct answer, while options C) +12.2% and D) -12.2% are not the correct percentage.