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Oswald Efficiency Factor Formula

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The Oswald Efficiency Factor is a correction factor that represents the change in drag with lift of a three-dimensional wing or airplane, as compared with an ideal wing having the same aspect ratio. Check FAQs

e osw = 1.78 \cdot (1 - 0.045 \cdot {AR}^{0.68}) - 0.64

e_osw - Oswald Efficiency Factor?AR - Wing Aspect Ratio?

Oswald Efficiency Factor Example

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Here is how the Oswald Efficiency Factor equation looks like with Values.

Here is how the Oswald Efficiency Factor equation looks like with Units.

Here is how the Oswald Efficiency Factor equation looks like.

0.6349 = 1.78 \cdot (1 - 0.045 \cdot 15^{0.68}) - 0.64

0.6349 = 1.78 \cdot (1 - 0.045 \cdot 15^{0.68}) - 0.64

0.6349 = 1.78 \cdot (1 - 0.045 \cdot 15^{0.68}) - 0.64

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Oswald Efficiency Factor Solution

Follow our step by step solution on how to calculate Oswald Efficiency Factor?

FIRST Step Consider the formula

e osw = 1.78 \cdot (1 - 0.045 \cdot {AR}^{0.68}) - 0.64

Next Step Substitute values of Variables

∴

e osw = 1.78 \cdot (1 - 0.045 \cdot 15^{0.68}) - 0.64

Next Step Prepare to Evaluate

∴

e osw = 1.78 \cdot (1 - 0.045 \cdot 15^{0.68}) - 0.64

Next Step Evaluate

∴

e osw = 0.634903252151742

LAST Step Rounding Answer

∴

e osw = 0.6349

Oswald Efficiency Factor Formula Elements

Variables

Oswald Efficiency Factor

The Oswald Efficiency Factor is a correction factor that represents the change in drag with lift of a three-dimensional wing or airplane, as compared with an ideal wing having the same aspect ratio.

Symbol: e_osw

Measurement: NAUnit: Unitless

Note: Value should be less than 1.

Formulas to find Oswald Efficiency Factor

Wing Aspect Ratio

Wing Aspect Ratio is defined as the ratio of the square of wingspan to the wing area or wingspan over wing chord for a rectangular planform.

Symbol: AR

Measurement: NAUnit: Unitless

Note: Value should be greater than 0.

Formulas to find Wing Aspect Ratio

Other formulas in Flow over Wings category

Go Effective Angle of Attack of Finite Wing

α eff = α g - α i

Go 2D Lift Curve Slope of Airfoil given Lift Slope of Finite Wing

a 0 = \frac{a C,l}{1 - \frac{a C,l \cdot (1 + τ)}{π \cdot AR}}

Go 2D Lift Curve Slope of Airfoil given Lift Slope of Elliptic Finite Wing

a 0 = \frac{a C,l}{1 - \frac{a C,l}{π \cdot AR}}

Go Aspect Ratio given Span Efficiency Factor

AR = \frac{{C L}^{2}}{π \cdot e span \cdot C D,i}

How to Evaluate Oswald Efficiency Factor?

Oswald Efficiency Factor evaluator uses Oswald Efficiency Factor = 1.78*(1-0.045*Wing Aspect Ratio^(0.68))-0.64 to evaluate the Oswald Efficiency Factor, The Oswald Efficiency Factor similar to the span efficiency It represents the ratio of induced drag to the total drag of the aircraft it is a correction factor that represents the change in drag with a lift of a three-dimensional wing or airplane. Oswald Efficiency Factor is denoted by e_osw symbol.

How to evaluate Oswald Efficiency Factor using this online evaluator? To use this online evaluator for Oswald Efficiency Factor, enter Wing Aspect Ratio (AR) and hit the calculate button.

FAQs on Oswald Efficiency Factor

What is the formula to find Oswald Efficiency Factor?

The formula of Oswald Efficiency Factor is expressed as Oswald Efficiency Factor = 1.78*(1-0.045*Wing Aspect Ratio^(0.68))-0.64. Here is an example- 0.634903 = 1.78*(1-0.045*15^(0.68))-0.64.

How to calculate Oswald Efficiency Factor?

With Wing Aspect Ratio (AR) we can find Oswald Efficiency Factor using the formula - Oswald Efficiency Factor = 1.78*(1-0.045*Wing Aspect Ratio^(0.68))-0.64.

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