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Empty Weight Fraction is the ratio of the operating empty weight to the desired takeoff weight. Check FAQs
Ef=OEWDTW
Ef - Empty Weight Fraction?OEW - Operating Empty Weight?DTW - Desired Takeoff Weight?

Empty Weight Fraction Example

With values
With units
Only example

Here is how the Empty Weight Fraction equation looks like with Values.

Here is how the Empty Weight Fraction equation looks like with Units.

Here is how the Empty Weight Fraction equation looks like.

0.5Edit=125000Edit250000Edit
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HomeIcon Home » Category Physics » Category Aerospace » Category Aircraft Mechanics » fx Empty Weight Fraction

Empty Weight Fraction Solution

Follow our step by step solution on how to calculate Empty Weight Fraction?

FIRST Step Consider the formula
Ef=OEWDTW
Next Step Substitute values of Variables
∴ Ef=125000kg250000kg
Next Step Prepare to Evaluate
∴ Ef=125000250000
LAST Step Evaluate
∴Ef=0.5

Empty Weight Fraction Formula Elements

Variables
Empty Weight Fraction
Empty Weight Fraction is the ratio of the operating empty weight to the desired takeoff weight.
Symbol: Ef
Measurement: NAUnit: Unitless
Note: Value should be greater than 0.
Formulas to find Empty Weight FractionOpen Variable
Operating Empty Weight
Operating Empty Weight of the aircraft is the aircraft's weight without including passengers, baggage, or fuel.
Symbol: OEW
Measurement: WeightUnit: kg
Note: Value should be greater than 0.
Formulas to find Operating Empty WeightOpen Variable
Desired Takeoff Weight
Desired Takeoff Weight (or mass) is the weight of the aircraft.
Symbol: DTW
Measurement: WeightUnit: kg
Note: Value should be greater than 0.
Formulas to find Desired Takeoff WeightOpen Variable

Other Formulas to find Empty Weight Fraction

​Go Empty Weight Fraction given Takeoff Weight and Fuel Fraction
Ef=1-Ff-PYL+WcDTW

Other formulas in Preliminary Design category

​Go Preliminary Take Off Weight Built-up for Manned Aircraft
DTW=PYL+OEW+FW+Wc
​Go Fuel Fraction
Ff=FWDTW
​Go Preliminary Take off Weight Built-Up for Manned Aircraft given Fuel and Empty Weight Fraction
DTW=PYL+Wc1-Ff-Ef
​Go Optimum Range for Jet Aircraft in Cruising Phase
R=VL/D(max)⋅LDmaxratioc⋅ln(WiWf)

How to Evaluate Empty Weight Fraction?

Empty Weight Fraction evaluator uses Empty Weight Fraction = Operating Empty Weight/Desired Takeoff Weight to evaluate the Empty Weight Fraction, The Empty Weight Fraction (EWF) is a parameter used in aircraft design and performance calculations to represent the ratio of the empty weight of the aircraft to its maximum takeoff weight (MTOW), it provides insights into the structural efficiency and payload-carrying capacity of the aircraft. Empty Weight Fraction is denoted by Ef symbol.

How to evaluate Empty Weight Fraction using this online evaluator? To use this online evaluator for Empty Weight Fraction, enter Operating Empty Weight (OEW) & Desired Takeoff Weight (DTW) and hit the calculate button.

FAQs on Empty Weight Fraction

What is the formula to find Empty Weight Fraction?
The formula of Empty Weight Fraction is expressed as Empty Weight Fraction = Operating Empty Weight/Desired Takeoff Weight. Here is an example- 0.04 = 125000/250000.
How to calculate Empty Weight Fraction?
With Operating Empty Weight (OEW) & Desired Takeoff Weight (DTW) we can find Empty Weight Fraction using the formula - Empty Weight Fraction = Operating Empty Weight/Desired Takeoff Weight.
What are the other ways to Calculate Empty Weight Fraction?
Here are the different ways to Calculate Empty Weight Fraction-
  • Empty Weight Fraction=1-Fuel Fraction-(Payload Carried+Crew Weight)/Desired Takeoff WeightOpenImg
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