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Drag per Unit Span Formula

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Drag Force is the resisting force experienced by an object moving through a fluid. Check FAQs

F D = \frac{0.86 \cdot q \cdot x L}{\sqrt{Re}}

F_D - Drag Force?q - Dynamic Pressure?x_L - Distance from Leading Edge?Re - Reynolds Number?

Drag per Unit Span Example

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Here is how the Drag per Unit Span equation looks like with Values.

Here is how the Drag per Unit Span equation looks like with Units.

Here is how the Drag per Unit Span equation looks like.

1.6654 = \frac{0.86 \cdot 10 \cdot 15}{\sqrt{6000}}

1.6654N = \frac{0.86 \cdot 10Pa \cdot 15m}{\sqrt{6000}}

1.6654 = \frac{0.86 \cdot 10 \cdot 15}{\sqrt{6000}}

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Drag per Unit Span Solution

Follow our step by step solution on how to calculate Drag per Unit Span?

FIRST Step Consider the formula

F D = \frac{0.86 \cdot q \cdot x L}{\sqrt{Re}}

Next Step Substitute values of Variables

∴

F D = \frac{0.86 \cdot 10Pa \cdot 15m}{\sqrt{6000}}

Next Step Prepare to Evaluate

∴

F D = \frac{0.86 \cdot 10 \cdot 15}{\sqrt{6000}}

Next Step Evaluate

∴

F D = 1.66538283886919N

LAST Step Rounding Answer

∴

F D = 1.6654N

Drag per Unit Span Formula Elements

Variables

Functions

Drag Force

Drag Force is the resisting force experienced by an object moving through a fluid.

Symbol: F_D

Measurement: ForceUnit: N

Note: Value can be positive or negative.

Formulas to find Drag Force

Dynamic Pressure

Dynamic Pressure is simply a convenient name for the quantity which represents the decrease in the pressure due to the velocity of the fluid.

Symbol: q

Measurement: PressureUnit: Pa

Note: Value should be greater than 0.

Formulas to find Dynamic Pressure

Distance from Leading Edge

The Distance from leading edge is known from the relation of drag force on a plate due to boundary layer.

Symbol: x_L

Measurement: LengthUnit: m

Note: Value can be positive or negative.

Formulas to find Distance from Leading Edge

Reynolds Number

The Reynolds number is the ratio of inertial forces to viscous forces within a fluid which is subjected to relative internal movement due to different fluid velocities.

Symbol: Re

Measurement: NAUnit: Unitless

Note: Value should be greater than 0.

Formulas to find Reynolds Number

sqrt

A square root function is a function that takes a non-negative number as an input and returns the square root of the given input number.

Syntax: sqrt(Number)

Other formulas in Viscous Flow category

Go Adiabatic Wall Enthalpy for Flat Plate

h aw = he + r \cdot (h 0 - he)

Go Adiabatic Wall Enthalpy using Recovery Factor

h aw = he + r \cdot \frac{{u e}^{2}}{2}

Go Aerodynamic Heating Equation for Stanton number

St = \frac{q w}{ρ e \cdot u e \cdot (h aw - h w)}

Go Coefficient of Friction using Stanton Number for Flat Plate Case

μ friction = \frac{2 \cdot St}{{Pr}^{- \frac{2}{3}}}

How to Evaluate Drag per Unit Span?

Drag per Unit Span evaluator uses Drag Force = (0.86*Dynamic Pressure*Distance from Leading Edge)/sqrt(Reynolds Number) to evaluate the Drag Force, The Drag per unit span formula is defined as the ratio of the product of dynamic pressure and distance from the leading edge to the square root of the critical Reynolds number. Drag Force is denoted by F_D symbol.

How to evaluate Drag per Unit Span using this online evaluator? To use this online evaluator for Drag per Unit Span, enter Dynamic Pressure (q), Distance from Leading Edge (x_L) & Reynolds Number (Re) and hit the calculate button.

FAQs on Drag per Unit Span

What is the formula to find Drag per Unit Span?

The formula of Drag per Unit Span is expressed as Drag Force = (0.86*Dynamic Pressure*Distance from Leading Edge)/sqrt(Reynolds Number). Here is an example- 1.665383 = (0.86*10*15)/sqrt(6000).

How to calculate Drag per Unit Span?

With Dynamic Pressure (q), Distance from Leading Edge (x_L) & Reynolds Number (Re) we can find Drag per Unit Span using the formula - Drag Force = (0.86*Dynamic Pressure*Distance from Leading Edge)/sqrt(Reynolds Number). This formula also uses Square Root Function function(s).

Can the Drag per Unit Span be negative?

Yes, the Drag per Unit Span, measured in Force can be negative.

Which unit is used to measure Drag per Unit Span?

Drag per Unit Span is usually measured using the Newton[N] for Force. Exanewton[N], Meganewton[N], Kilonewton[N] are the few other units in which Drag per Unit Span can be measured.

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