# Brantly B2-B/Weight and Balance

SECTION 5. WEIGHT AND BALANCE

### 1 WEIGHT AND CG LIMITS

The weight and CG limits for this aircraft are:

Max Gross Weight: | 1670 lb |

Max Forward CG: | 96 inches |

Max Aft CG: | 103 inches |

### 2 EMPTY WEIGHT AND CG

The empty weight and CG of this aircraft are:

Empty Weight: | 1109 lb |

Empty Aircraft CG: | 104.7 in |

Empty Moment: | 116112 lb-in |

### 3 CG ARM DATA

The following arm data can be used to calculate moment at each of these stations.

Pilot: | 72.4 in (1.84 m) |

Fuel : | 115.8 in (2.94m) |

Baggage: | 159.1 in (4.04m) |

### 4 WEIGHT AND CG CALCULATION

Total weight is calculated by adding total weight of empty aircraft, fuel, passengers and baggage. Fuel weight can be calculated assuming 6 pounds per gallon of fuel. The CG is obtained by dividing total moment by total weight. Moment at each station is obtained by multiplying the arm of that station by the weight at that station. Total moment is obtained by adding moment for each station and the moment for the empty aircraft.

As an example, consider a 180 lb pilot, a 160 lb passenger and 25 gallons of fuel. Weight of the fuel will be 25*6=150 lb.

Item | Weight | Arm | Moment |
---|---|---|---|

Aircraft | 1109 | 104.7 | 116112 |

Pilot | 180 | 72.4 | 13032 |

Co-Pilot | 160 | 72.4 | 11584 |

Fuel | 150 | 115.8 | 17370 |

Total | 1599 | x | 158098 |

The final CG is calculated by dividing the total moment 158098 by the total weight 1599 yielding 98.9 inches. Cross checking the total weight and CG with the weight/CG limits indicates the aircraft is within limits. The "CG" is also calculated and displayed on the main menu for convenience.