Plane Weight And Balance Calculator

Center of Gravity Formula:

\[ CG = \frac{\sum (Weight_i \times Arm_i)}{Total\ Weight} \]

Weight 1:

lbs

Arm 1:

Weight 2:

lbs

Arm 2:

Weight 3:

lbs

Arm 3:

Total Weight:

Total Moment:

Center of Gravity (CG):

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1. What is Aircraft Weight and Balance?

Aircraft weight and balance refers to the calculation of the aircraft's total weight and the location of its center of gravity (CG). Proper weight and balance is critical for flight safety, stability, and performance.

2. How Does the Calculator Work?

The calculator uses the center of gravity formula:

\[ CG = \frac{\sum (Weight_i \times Arm_i)}{Total\ Weight} \]

Where:

\( CG \) — Center of Gravity (inches)
\( Weight_i \) — Individual component weight (pounds)
\( Arm_i \) — Distance from reference datum (inches)
\( Total\ Weight \) — Sum of all weights (pounds)

Explanation: The formula calculates the weighted average position where the aircraft's mass is concentrated, determining its balance point.

3. Importance of Weight and Balance

Details: Proper weight and balance ensures aircraft stability, control effectiveness, and structural integrity. An out-of-balance aircraft can be unstable, difficult to control, or structurally overloaded.

4. Using the Calculator

Tips: Enter weights in pounds and arm distances in inches from the reference datum. Include all major components: empty weight, fuel, passengers, baggage, and cargo.

5. Frequently Asked Questions (FAQ)

Q1: What is the reference datum?
A: The reference datum is an imaginary vertical plane from which all horizontal distances are measured, typically located at or forward of the aircraft nose.

Q2: Why is CG position important?
A: CG position affects aircraft stability, control forces, stall speed, and overall handling characteristics. Forward CG increases stability but may require more elevator force.

Q3: What are CG limits?
A: Each aircraft has specific forward and aft CG limits established by the manufacturer. Operating outside these limits is dangerous and prohibited.

Q4: How often should weight and balance be calculated?
A: Weight and balance should be calculated for every flight, especially when loading changes significantly or when flying with different configurations.

Q5: What is moment in weight and balance?
A: Moment is the product of weight times arm (distance from datum). It represents the force effect of the weight at that particular location.