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Specific thrust Formula

GoSpecific Thrust given Effective Speed Ratio Formula

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Specific Thrust is the thrust produced per unit mass in per unit time. Check FAQs

I sp = V e - V

I_sp - Specific Thrust?V_e - Exit Velocity?V - Flight Speed?

Specific thrust Example

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Here is how the Specific thrust equation looks like with Values.

Here is how the Specific thrust equation looks like with Units.

Here is how the Specific thrust equation looks like.

137 = 248 - 111

137m/s = 248m/s - 111m/s

137 = 248 - 111

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Specific thrust Solution

Follow our step by step solution on how to calculate Specific thrust?

FIRST Step Consider the formula

I sp = V e - V

Next Step Substitute values of Variables

∴

I sp = 248m/s - 111m/s

Next Step Prepare to Evaluate

∴

I sp = 248 - 111

LAST Step Evaluate

∴

I sp = 137m/s

Specific thrust Formula Elements

Variables

Specific Thrust

Specific Thrust is the thrust produced per unit mass in per unit time.

Symbol: I_sp

Measurement: SpeedUnit: m/s

Note: Value should be greater than 0.

Formulas to find Specific Thrust

Exit Velocity

Exit Velocity refers to the speed at which gases expand at the exit of nozzle of a engine.

Symbol: V_e

Measurement: SpeedUnit: m/s

Note: Value can be positive or negative.

Formulas to find Exit Velocity

Flight Speed

Flight Speed refers to the velocity at which an aircraft moves through the air.

Symbol: V

Measurement: SpeedUnit: m/s

Note: Value should be greater than 0.

Formulas to find Flight Speed

Other Formulas to find Specific Thrust

Go Specific Thrust given Effective Speed Ratio

I sp = V e \cdot (1 - α)

Other formulas in Thrust Generation category

Go Total Thrust given Efficiency and Enthalpy

T total = m a \cdot ((\sqrt{2 \cdot Δh nozzle \cdot η nozzle}) - V + (\sqrt{η T \cdot η transmission \cdot Δh turbine}))

Go Ideal Thrust given Effective Speed Ratio

T ideal = m a \cdot V \cdot ((\frac{1}{α}) - 1)

Go Thrust power

T P = m a \cdot V \cdot (V e - V)

Go Thrust specific fuel consumption

TSFC = \frac{f a}{I sp}

How to Evaluate Specific thrust?

Specific thrust evaluator uses Specific Thrust = Exit Velocity-Flight Speed to evaluate the Specific Thrust, Specific Thrust is a measure of the efficiency of a propulsion system, calculated as the difference between the exit velocity of the exhaust gases and the flight speed, providing a critical performance indicator for aerospace engineers and aircraft designers. Specific Thrust is denoted by I_sp symbol.

How to evaluate Specific thrust using this online evaluator? To use this online evaluator for Specific thrust, enter Exit Velocity (V_e) & Flight Speed (V) and hit the calculate button.

FAQs on Specific thrust

What is the formula to find Specific thrust?

The formula of Specific thrust is expressed as Specific Thrust = Exit Velocity-Flight Speed. Here is an example- 137 = 248-111.

How to calculate Specific thrust?

With Exit Velocity (V_e) & Flight Speed (V) we can find Specific thrust using the formula - Specific Thrust = Exit Velocity-Flight Speed.

What are the other ways to Calculate Specific Thrust?

Here are the different ways to Calculate Specific Thrust-

Specific Thrust=Exit Velocity*(1-Effective Speed Ratio)

Can the Specific thrust be negative?

No, the Specific thrust, measured in Speed cannot be negative.

Which unit is used to measure Specific thrust?

Specific thrust 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 Specific thrust can be measured.

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Specific thrust Formula

​GoSpecific Thrust given Effective Speed Ratio Formula

Specific thrust Example

Specific thrust Solution

Specific thrust Formula Elements

Other Formulas to find Specific Thrust

Other formulas in Thrust Generation category

How to Evaluate Specific thrust?

FAQs on Specific thrust

Variable Name

GoSpecific Thrust given Effective Speed Ratio Formula