Bonanza G36 Weight and Balance Calculator

Bonanza G36 Weight & Balance

Input the weights and arm measurements for your aircraft's components to determine the current weight and balance. Ensure your aircraft is within the approved limits for safe flight.

Calculation Results

Formula:
Total Weight = Sum of all individual weights.
Total Moment = Sum of (Weight x Arm) for all components.
Center of Gravity (CG) = Total Moment / Total Weight.

Weight and Balance Data

Item	Weight (lbs)	Arm (in)	Moment (lb-in)
Empty Weight	—	—	—
Pilot	—	—	—
Passenger 1	—	—	—
Passenger 2	—	—	—
Baggage 1	—	—	—
Baggage 2	—	—	—
Fuel	—	—	—
TOTALS	—	—	—

Center of Gravity Envelope

Chart Explanation: This chart visualizes the calculated Center of Gravity (CG) against the aircraft's total weight, showing whether it falls within the approved flight envelope. The shaded area represents the safe operating limits.

What is Bonanza G36 Weight and Balance?

The Bonanza G36 weight and balance calculation is a critical process in aviation safety. It involves determining the total weight of the aircraft and the location of its center of gravity (CG) at a specific point in time, typically before flight. This calculation ensures that the aircraft remains within its designed operational limits, which are crucial for stable and safe flight characteristics. The Bonanza G36, a popular single-engine aircraft, has specific weight and CG limitations outlined in its Pilot's Operating Handbook (POH) that must be adhered to.

Who should use it: Any pilot operating a Beechcraft Bonanza G36, aircraft owners, maintenance personnel, and flight instructors responsible for pre-flight planning and ensuring aircraft safety.

Common misconceptions: A common misconception is that weight and balance is a simple addition of all items. In reality, the *moment* (weight multiplied by its distance from a reference point, known as the arm) is what truly matters for CG calculation. Another misconception is that if the total weight is below maximum takeoff weight, the aircraft is automatically safe; however, an out-of-limits CG can render an aircraft unflyable even if it's underweight.

Bonanza G36 Weight and Balance Formula and Mathematical Explanation

The core of weight and balance calculation lies in understanding moments and their relation to the center of gravity. The process involves summing up the moments of all individual components of the aircraft and then dividing by the total weight to find the CG.

The fundamental formula is:

Center of Gravity (CG) = Total Moment / Total Weight

Let's break down the components:

• Weight: This is the mass of each item in the aircraft, measured in pounds (lbs).
• Arm: This is the horizontal distance from a datum line (a fixed reference point, usually the firewall or a specific point on the aircraft structure) to the center of mass of an item. It's measured in inches (in).
• Moment: This is the product of an item's weight and its arm (Weight × Arm). It represents the turning effect of that weight about the datum. The unit is pound-inches (lb-in).

The calculation proceeds as follows:

1. Calculate the moment for each item: For every item (empty weight, pilot, passengers, baggage, fuel, etc.), multiply its weight by its respective arm.
2. Calculate the Total Moment: Sum up all the individual moments calculated in step 1.
3. Calculate the Total Weight: Sum up the weights of all items, including the empty weight of the aircraft.
4. Calculate the Center of Gravity (CG): Divide the Total Moment by the Total Weight.

Variables Table:

Variable	Meaning	Unit	Typical Range (G36)
Empty Weight	Weight of the aircraft without crew, passengers, or usable fuel.	lbs	2200 – 2400
Empty Moment	Moment of the empty aircraft about the datum.	lb-in	85,000 – 98,000
Pilot Weight	Weight of the pilot.	lbs	150 – 250
Pilot Arm	Distance of pilot's center of mass from datum.	in	35 – 40
Passenger Weight	Weight of each passenger.	lbs	100 – 250
Passenger Arm	Distance of passenger's center of mass from datum.	in	38 – 50
Baggage Weight	Weight of baggage in specified compartments.	lbs	0 – 100 (per compartment, check POH limits)
Baggage Arm	Distance of baggage compartment center of mass from datum.	in	65 – 95
Fuel Weight	Weight of usable fuel (approx. 6 lbs/gallon).	lbs	0 – 400 (for full tanks, approx. 66 gal)
Fuel Arm	Distance of fuel center of mass from datum.	in	38 – 42 (varies with tank location)
Total Weight	Sum of all weights.	lbs	Max Takeoff Weight: 3600
Total Moment	Sum of all moments.	lb-in	Varies significantly based on loadout.
Center of Gravity (CG)	Calculated CG position.	in	Forward Limit: ~75.0, Aft Limit: ~87.0 (check POH)

Practical Examples (Real-World Use Cases)

Let's illustrate with two scenarios for a Bonanza G36:

Example 1: Solo Flight with Full Tanks

Scenario: A pilot is flying solo, with full fuel tanks, and minimal baggage.

Inputs:

• Empty Weight: 2350 lbs
• Empty Moment: 94000 lb-in
• Pilot Weight: 180 lbs
• Pilot Arm: 37.0 in
• Passenger 1 Weight: 0 lbs
• Passenger 1 Arm: 40.0 in
• Passenger 2 Weight: 0 lbs
• Passenger 2 Arm: 45.0 in
• Baggage 1 Weight: 0 lbs
• Baggage 1 Arm: 70.0 in
• Baggage 2 Weight: 0 lbs
• Baggage 2 Arm: 90.0 in
• Fuel Weight: 396 lbs (66 gallons * 6 lbs/gal)
• Fuel Arm: 40.0 in

Calculations:

• Pilot Moment: 180 * 37.0 = 6660 lb-in
• Fuel Moment: 396 * 40.0 = 15840 lb-in
• Total Weight: 2350 + 180 + 0 + 0 + 0 + 0 + 396 = 2926 lbs
• Total Moment: 94000 + 6660 + 0 + 0 + 0 + 0 + 15840 = 116500 lb-in
• CG: 116500 / 2926 = 39.82 inches

Interpretation: With a total weight of 2926 lbs and a CG of 39.82 inches, this configuration is well within the typical forward CG limits for the Bonanza G36, even with full fuel. This is a common scenario for cross-country flights.

Example 2: Four Adults, Light Baggage, Half Fuel

Scenario: Four adults are flying, with light baggage in the rear compartment, and half fuel load.

Inputs:

• Empty Weight: 2350 lbs
• Empty Moment: 94000 lb-in
• Pilot Weight: 190 lbs
• Pilot Arm: 37.0 in
• Passenger 1 Weight: 160 lbs
• Passenger 1 Arm: 40.0 in
• Passenger 2 Weight: 170 lbs
• Passenger 2 Arm: 45.0 in
• Baggage 1 Weight: 0 lbs
• Baggage 1 Arm: 70.0 in
• Baggage 2 Weight: 50 lbs
• Baggage 2 Arm: 90.0 in
• Fuel Weight: 198 lbs (33 gallons * 6 lbs/gal)
• Fuel Arm: 40.0 in

Calculations:

• Pilot Moment: 190 * 37.0 = 7030 lb-in
• Passenger 1 Moment: 160 * 40.0 = 6400 lb-in
• Passenger 2 Moment: 170 * 45.0 = 7650 lb-in
• Baggage 2 Moment: 50 * 90.0 = 4500 lb-in
• Fuel Moment: 198 * 40.0 = 7920 lb-in
• Total Weight: 2350 + 190 + 160 + 170 + 0 + 50 + 198 = 3118 lbs
• Total Moment: 94000 + 7030 + 6400 + 7650 + 0 + 4500 + 7920 = 127500 lb-in
• CG: 127500 / 3118 = 40.89 inches

Interpretation: With a total weight of 3118 lbs and a CG of 40.89 inches, this configuration is also well within the forward CG limits. However, it's important to note that adding more weight, especially further aft, could push the CG towards the aft limit. Always consult the POH for specific limits.

How to Use This Bonanza G36 Weight and Balance Calculator

Using this calculator is straightforward and essential for safe flight operations. Follow these steps:

1. Gather Aircraft Data: Obtain your Bonanza G36's current empty weight and empty moment from its Weight and Balance record or logbook. This is a fixed value unless modifications are made.
2. Determine Occupant and Baggage Weights: Accurately estimate or weigh the pilot, passengers, and any baggage you plan to carry.
3. Find Arm Measurements: Consult your Bonanza G36 Pilot's Operating Handbook (POH) or aircraft-specific documentation for the correct arm measurements (distance from the datum) for each occupant seating position, baggage compartment, and fuel tanks.
4. Input Data: Enter the gathered weights and arm measurements into the corresponding fields in the calculator.
5. Calculate: Click the "Calculate" button.
6. Review Results: The calculator will display the Total Weight, Total Moment, and the resulting Center of Gravity (CG) in inches. It will also populate a table with the breakdown of each item's moment.
7. Check Against Limits: Compare your calculated Total Weight against the Maximum Takeoff Weight (MTOW) for your G36. Crucially, compare your calculated CG against the forward and aft CG limits specified in your aircraft's POH for the current weight. The chart provides a visual representation of this.
8. Adjust Load if Necessary: If the calculated CG is outside the limits, you must adjust the load. This might involve removing weight, redistributing baggage, or reducing fuel.
9. Copy Results: Use the "Copy Results" button to save or document your weight and balance calculation.
10. Reset: Use the "Reset" button to clear all fields and start a new calculation.

Decision-making guidance: If your calculated CG falls outside the approved envelope (forward or aft), the aircraft is not safe to fly in that configuration. You must make adjustments. If the total weight exceeds the MTOW, you must reduce weight. Always prioritize safety and adherence to the POH.

Key Factors That Affect Bonanza G36 Results

Several factors significantly influence the weight and balance calculations for a Bonanza G36, impacting flight safety and performance:

1. Occupant Distribution: The CG of passengers and the pilot is critical. Placing heavier passengers in aft seats will shift the CG aft, while placing them in forward seats shifts it forward.
2. Fuel Load: Fuel is a significant weight component. As fuel is consumed during flight, the total weight decreases, and the CG typically shifts forward (depending on tank location). The initial fuel load and its arm are vital inputs.
3. Baggage Loading: Different baggage compartments have different arm measurements. Loading heavier items in aft compartments (higher arm) will shift the CG aft more significantly than loading them in forward compartments. POH often specifies weight limits per compartment and CG restrictions based on baggage loading.
4. Aircraft Modifications: Installing new avionics, STOL kits, or other modifications can change the aircraft's empty weight and empty moment. These changes must be properly documented and incorporated into the aircraft's official Weight and Balance data.
5. Water and Waste Systems: Aircraft equipped with optional water or waste systems add weight and have specific arm measurements that must be accounted for, especially if they are not full or empty.
6. Equipment Changes: Removing or adding equipment, even temporarily (like survival gear for a specific trip), affects the total weight and CG. Always ensure all carried items are accounted for.
7. Datum Reference Point: The choice of datum (reference point) is fixed for each aircraft type. All arm measurements are relative to this datum. An incorrect datum or arm measurement will lead to erroneous CG calculations.
8. Maximum Takeoff Weight (MTOW): While not directly affecting CG calculation, the total weight must not exceed the MTOW. Exceeding MTOW compromises performance, structural integrity, and safety.

Frequently Asked Questions (FAQ)

Q1: What is the datum for the Bonanza G36?

A1: The datum for the Beechcraft Bonanza G36 is typically located at the firewall. However, always verify the exact datum location and reference point in your specific aircraft's Pilot's Operating Handbook (POH) or Weight and Balance manual.

Q2: How often should I update my aircraft's weight and balance?

A2: The weight and balance should be recalculated before each flight based on the planned load. The aircraft's *empty weight and balance* record needs updating only after significant maintenance or modifications that change its empty weight or empty moment.

Q3: What happens if my CG is too far forward?

A3: An excessively forward CG can make the aircraft difficult or impossible to control, potentially leading to a stall or loss of control. The elevators may not have enough authority to raise the nose for landing or to maintain level flight.

Q4: What happens if my CG is too far aft?

A4: An excessively aft CG makes the aircraft unstable and difficult to control. It can lead to a tendency for the aircraft to pitch up uncontrollably, potentially resulting in a stall or spin. The aircraft becomes very sensitive to control inputs.

Q5: Can I use this calculator for other Bonanza models (e.g., V35, A36)?

A5: While the principles are the same, the specific weight, arm, and CG limits differ between Bonanza models. This calculator is specifically tailored for the G36. Always use the POH relevant to your specific aircraft model.

Q6: What is the Maximum Takeoff Weight (MTOW) for a Bonanza G36?

A6: The standard MTOW for most Bonanza G36 models is 3600 lbs. However, always confirm the exact MTOW for your specific aircraft serial number in its POH.

Q7: How do I find the arm for my passengers?

A7: Arm measurements for passengers are typically based on average seating positions. Your POH will provide standard arm values for different seating rows (e.g., front seats, rear seats). If a passenger is significantly taller or shorter, or sits in a non-standard position, you may need to make adjustments or consult specific guidance.

Q8: What if my calculated weight is below MTOW but the CG is out of limits?

A8: This is a critical situation. Even if the aircraft is not overweight, an out-of-limits CG makes it unsafe to fly. You must redistribute weight (e.g., move baggage forward, have lighter passengers sit forward) or remove weight entirely until both the total weight and CG are within the approved limits.