## How do you calculate arm and moment?

Multiply each weight by the arm—the distance from the reference datum—to find the moment. Add all the weights to find the gross weight. Add all the moments to find the total moment.

**Does basic empty weight include unusable fuel?**

Basic Empty Weight – The starting point for weight computations is the basic empty weight, which is the weight of the standard helicopter, optional equipment, unusable fuel, and full operating fluids including full engine oil. It includes the flight crew, usable fuel, drainable oil, if applicable, and payload.

### How do you calculate fuel weight?

What will be your takeoff fuel weight? To calculate your takeoff fuel weight, multiply your takeoff gallons by the weight of fuel. What will be your landing fuel weight? To find this, you’ll need to know your landing gallons, and multiply this by the weight of fuel.

**What is moment and arm?**

(A moment arm is the distance from a datum [reference point or line] to the applied force.) For aircraft weight and balance computations, “moments” are expressed in terms of the distance of the arm times the aircraft’s weight, or simply, inch-pounds.

#### What is the difference between licensed empty weight and basic empty weight?

Basic empty weight is the standard empty weight plus optional equipment. Note that basic empty weight includes no usable fuel, but full oil. Licensed empty weight, therefore, includes the standard airplane, optional equipment, full hydraulic fluid, unusable fuel, and undrainable oil.

**How does a pilot know the weight of a plane?**

The airline crews don’t know the weight of their passengers. This is taken usually from a chart X number of passengers times X pounds. These pounds plus cargo, fuel weight, aircraft weight are all factored into the gross weight of the aircraft for take off, etc..

## How much does 1 Litre of jet fuel weigh kg?

0.8 kilograms

As noted above, the volume of a liquid can change, depending on the ambient temperature, so for the conversions noted on the right, a generally accepted average worldwide density of jet fuel of 0.8 is used: If 1 kilogram of water is 1 litre, 0.8 kilograms of jet fuel is 1 litre.

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