1. What is Arrow FOC?

FOC (Front of Center) is a critical measurement in archery that indicates the percentage of an arrow's total weight that is located in the front half of the arrow. It affects arrow flight stability and penetration.

2. How Does the Calculator Work?

The calculator uses the FOC formula:

Where:

• \( Front \) — Front grains weight (Front_a_f)
• \( Total \) — Total arrow weight in grains (Total_a_f)
• \( FOC \) — Front of Center percentage (FOC_a_f)

Explanation: This calculation determines what percentage of the arrow's total weight is concentrated in the front portion, which significantly impacts arrow performance and accuracy.

3. Importance of FOC Calculation

Details: Proper FOC is essential for optimal arrow flight, better penetration, and improved accuracy. Different hunting and target scenarios require specific FOC percentages for best performance.

4. Using the Calculator

Tips: Enter the front grains weight and total arrow weight in grains. Both values must be positive numbers, and the front weight cannot exceed the total weight.

5. Frequently Asked Questions (FAQ)

Q1: What is the ideal FOC percentage for hunting?
A: Most hunters prefer 10-15% FOC for broadhead-tipped arrows, as this provides good stability and penetration.

Q2: What FOC is best for target shooting?
A: Target archers typically use 7-12% FOC for better consistency and group tightness.

Q3: How do I measure front weight accurately?
A: Front weight includes the point, insert, and any weight forward of the arrow's balance point.

Q4: Can FOC be too high?
A: Yes, excessively high FOC (over 20%) can make arrows unstable and difficult to tune properly.

Q5: How does FOC affect arrow flight?
A: Higher FOC arrows tend to fly more steadily and penetrate better, while lower FOC arrows may be faster but less stable.