Freestream Velocity in Level Flight Formulas

The Freestream Velocity is the velocity of air far upstream of an aerodynamic body, that is before the body has a chance to deflect, slow down or compress the air. And is denoted by V_∞. Freestream Velocity is usually measured using the Meter per Second for Speed. Note that the value of Freestream Velocity is always positive.

Formulas to find Freestream Velocity in Level Flight

fxFreestream Velocity given required PowerGo

fxFreestream Velocity given Total Drag ForceGo

Level Flight formulas that make use of Freestream Velocity

fxTotal Drag Force given required PowerGo

fxPower required for given required thrust of aircraftGo

fxThrust of Aircraft required for given required PowerGo

fxPower required for given aerodynamic coefficientsGo

fxWeight of aircraft for given required powerGo

fxPower required for given total drag forceGo

List of variables in Level Flight formulas

fx Power Go

fx Thrust Go

fx Drag Force Go

FAQ

What is the Freestream Velocity?

The Freestream Velocity is the velocity of air far upstream of an aerodynamic body, that is before the body has a chance to deflect, slow down or compress the air. Freestream Velocity is usually measured using the Meter per Second for Speed. Note that the value of Freestream Velocity is always positive.

Can the Freestream Velocity be negative?

No, the Freestream Velocity, measured in Speed cannot be negative.

What unit is used to measure Freestream Velocity?

Freestream Velocity is usually measured using the Meter per Second[m/s] for Speed. Meter per Minute[m/s], Meter per Hour[m/s], Kilometer per Hour[m/s] are the few other units in which Freestream Velocity can be measured.

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