Jet Propulsion & Reaction Forces

Inside this lesson

Derive the thrust equation T = ṁVe + (pe − pa)Ae from the steady momentum balance on a rocket/jet control volume
Explain the two terms (momentum flux and pressure thrust) and state when the pressure term vanishes (pe = pa)
Compute the reaction (recoil) force on a nozzle or hose from the rate of momentum leaving, ṁVexit
Connect jet-on-vane reaction forces (Lesson 2) to propulsion thrust as the same momentum principle run in reverse

Unlock the full Mechanical Engineering bundle

Every paid lesson across both the Fluid Mechanics and Solid Mechanics courses — one purchase, both courses.
Interactive simulators for the Moody chart, Bernoulli's equation, hydrostatic forces, and more.

Get the bundle →

One-time purchase — see options on the next page.

or unlock everything with all-access

Not ready yet? Keep learning for free — start with the hydrostatic equation or what a fluid is.

⚖️

Educational content covering topics typical of a first- and second-year mechanical engineering curriculum. Not a substitute for accredited coursework, and not suitable for real fluid-system design without review by a licensed professional engineer.