Robert Goddard's Early Design for Liquid-Fueled Rocket Engines

A foundational 1914 patent by Robert Goddard detailing the basic mechanical structure of a rocket engine using liquid fuel.

What it covers

This patent describes a rocket apparatus designed to improve efficiency by using a combustion chamber and a nozzle to accelerate exhaust gases. It outlines a system where liquid fuel and an oxidizer are injected into a chamber to create controlled thrust. By focusing on the geometry of the combustion chamber and the expansion of gases, it established the fundamental architecture for modern liquid-propellant rockets. This was a significant shift from the solid-fuel rockets used for centuries, as it allowed for more controlled and sustained flight.

What it doesn't cover

• —Does not cover modern guidance or navigation systems for rockets.
• —Does not cover multi-stage rocket designs or separation mechanisms.
• —Does not cover specific chemical compositions of modern high-performance rocket fuels.
• —Does not cover electronic ignition systems or computer-controlled thrust vectoring.

The clever bit

Goddard realized that a rocket could operate in a vacuum by carrying its own oxidizer, and he used a de Laval nozzle to maximize the velocity of exhaust gases.

Why it matters

Robert Goddard is widely considered the father of modern rocketry. This patent provided the early conceptual framework that allowed engineers to move beyond simple fireworks and toward space exploration. It remains a primary reference point in the history of aerospace engineering.

Real-world examples

• 1.Liquid-fueled rocket engines
• 2.SpaceX Merlin engines
• 3.Blue Origin BE-4 engines
• 4.Early sounding rockets