Drag per Unit Span Formula

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The Drag Force is the resistance experienced by an object moving through a fluid, influenced by the fluid's viscosity and the object's surface area. Check FAQs
FD=0.86qxLRe
FD - Drag Force?q - Dynamic Pressure?xL - Distance from Leading Edge?Re - Reynolds Number?

Drag per Unit Span Example

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With units
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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.

1.6654Edit=0.8610Edit15Edit6000Edit
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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
FD=0.86qxLRe
Next Step Substitute values of Variables
FD=0.8610Pa15m6000
Next Step Prepare to Evaluate
FD=0.8610156000
Next Step Evaluate
FD=1.66538283886919N
LAST Step Rounding Answer
FD=1.6654N

Drag per Unit Span Formula Elements

Variables
Functions
Drag Force
The Drag Force is the resistance experienced by an object moving through a fluid, influenced by the fluid's viscosity and the object's surface area.
Symbol: FD
Measurement: ForceUnit: N
Note: Value can be positive or negative.
Dynamic Pressure
The Dynamic Pressure is the pressure associated with the motion of a fluid, reflecting the kinetic energy per unit volume of the flow.
Symbol: q
Measurement: PressureUnit: Pa
Note: Value should be greater than 0.
Distance from Leading Edge
The Distance from Leading Edge is the measurement from the front edge of a flat plate to a specific point in viscous flow, influencing flow characteristics and behavior.
Symbol: xL
Measurement: LengthUnit: m
Note: Value can be positive or negative.
Reynolds Number
The Reynolds Number is a dimensionless quantity that helps predict flow patterns in different fluid flow situations, indicating whether the flow is laminar or turbulent.
Symbol: Re
Measurement: NAUnit: Unitless
Note: Value should be greater than 0.
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
haw=he+r(h0-he)
​Go Adiabatic Wall Enthalpy using Recovery Factor
haw=he+rue22
​Go Aerodynamic Heating Equation for Stanton number
St=qwρeue(haw-hw)
​Go Coefficient of Friction using Stanton Number for Flat Plate Case
μfriction=2StPr-23

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, Drag per Unit Span formula is defined as a measure of the drag force per unit span of a flat plate in viscous flow, which is a critical parameter in understanding the flow behavior and drag characteristics of various engineering systems. Drag Force is denoted by FD 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 (xL) & 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 (xL) & 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 (sqrt) 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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