Easton Archery FOC Equation:
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FOC (Front of Center) is a measurement that describes the percentage of an arrow's total weight that is located in the front half of the arrow. It's a critical factor in arrow flight and stability.
The calculator uses the Easton Archery FOC equation:
Where:
Explanation: The equation calculates what percentage of the arrow's length is in front of the exact center point.
Details: Proper FOC affects arrow stability, accuracy, and penetration. Most target arrows have 10-15% FOC, while hunting arrows typically have 12-20% FOC.
Tips:
Q1: What is the ideal FOC percentage?
A: Ideal FOC depends on arrow use: 10-15% for target shooting, 12-20% for hunting. Higher FOC increases stability but reduces speed.
Q2: How does FOC affect arrow flight?
A: Higher FOC makes arrows more stable in flight but requires more energy to achieve same speed. Lower FOC arrows are faster but less stable.
Q3: Can FOC be too high?
A: Yes, excessive FOC (>25%) can make arrows unstable and cause fishtailing. It also reduces speed and increases arrow drop.
Q4: How do I adjust FOC?
A: Increase FOC by adding weight to front (heavier points, inserts) or reduce rear weight (lighter vanes, nocks). Decrease FOC by opposite adjustments.
Q5: Does FOC affect broadhead tuning?
A: Yes, proper FOC is especially important for broadhead tuning as it affects arrow stability and flight characteristics.