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The FPS to Knots conversion is used to convert speed measurements from feet per second (FPS) to knots (nautical miles per hour). This conversion is particularly important in aviation, maritime navigation, and meteorology where different speed units are used.
The calculator uses the conversion formula:
Where:
Explanation: One knot equals one nautical mile per hour, and since one nautical mile is 6,076.12 feet and one hour has 3,600 seconds, the conversion factor is derived from 6,076.12 ÷ 3,600 ≈ 1.68781.
Details: Accurate speed conversion is crucial for navigation, flight planning, weather reporting, and international communication where different measurement systems are used. Knots are the standard unit for maritime and aviation speeds worldwide.
Tips: Enter the speed value in feet per second (FPS). The value must be non-negative. The calculator will instantly convert it to knots with high precision.
Q1: What is the difference between knots and miles per hour?
A: One knot equals approximately 1.15078 miles per hour. Knots are based on nautical miles (1,852 meters) while MPH are based on statute miles (1,609 meters).
Q2: Why are knots used instead of MPH in aviation and maritime?
A: Knots are used because they relate directly to nautical miles and degrees of latitude, making navigation calculations more straightforward for long-distance travel.
Q3: How accurate is the conversion factor 1.68781?
A: The factor is highly accurate, derived from the international definition of a nautical mile as exactly 1,852 meters and standardized time units.
Q4: Can I convert knots back to FPS?
A: Yes, to convert knots to FPS, multiply the knots value by 1.68781 (the inverse operation).
Q5: What are typical FPS values for common speeds?
A: For reference: 10 knots ≈ 16.88 FPS, 20 knots ≈ 33.76 FPS, 50 knots ≈ 84.39 FPS. Commercial aircraft cruise at about 450-500 knots (759-844 FPS).