# How the Wright Brothers Invented Modern Airplane Control

> The foundational patent for the first successful powered, heavier-than-air flying machine that could be controlled in flight.

- **Patent:** US 821393
- **Original title:** Flying-machine.
- **Owner:** Individual
- **Granted:** 1906
- **Status:** Public domain (expired)
- **Times cited:** 19
- **Field:** aerospace, mechanical

## What it does

The patent describes a system for controlling a flying machine by warping the wings to maintain balance and steer. It utilizes a mechanism to twist the wing tips in opposite directions, creating a difference in lift that causes the aircraft to bank. This lateral control, combined with a vertical rudder, allowed the pilot to maintain stability against wind gusts and execute coordinated turns.

## What it does NOT cover

- Does not cover jet propulsion or turbine engines.
- Does not cover vertical takeoff and landing (VTOL) technology.
- Does not cover fly-by-wire electronic flight control systems.
- Does not cover pressurized cabins or high-altitude flight systems.

## The clever bit

The innovation was realizing that an airplane needs to be controlled like a bicycle, using active wing-warping to manage roll, rather than just relying on inherent stability.

## Real-world examples

1. The Wright Flyer
2. Early 20th-century biplanes
3. Modern aileron-based flight control systems

## Why it matters

This patent represents the birth of controlled, powered flight. It shifted aviation from unstable gliding to predictable, pilot-directed navigation, setting the technical standard for all subsequent fixed-wing aircraft development.

## Frequently asked questions

### What does How the Wright Brothers Invented Modern Airplane Control cover?

The foundational patent for the first successful powered, heavier-than-air flying machine that could be controlled in flight.

### Who owns patent US 821393?

Individual owns this patent, granted in 1906.

### When does this patent expire?

This patent has expired and is now in the public domain — anyone can use the invention freely.

### What is patent US 821393 cited by?

This patent has been cited by 19 later patents that build on its ideas.

### What problem does this patent solve?

This patent represents the birth of controlled, powered flight. It shifted aviation from unstable gliding to predictable, pilot-directed navigation, setting the technical standard for all subsequent fixed-wing aircraft development.

### What does this patent NOT cover?

Does not cover jet propulsion or turbine engines.

**Full plain-English explainer:** https://patentbrief.org/patent/us/821393/wright-brothers-flying-machine

**Original patent:** https://patents.google.com/patent/US821393

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_Source: PatentBrief — https://patentbrief.org. Patent facts are from public records; the plain-English explanation is PatentBrief's._


## Related patents

Semantically similar inventions in the PatentBrief corpus:

- [How the Rogallo Flexible Wing Kite Works](https://patentbrief.org/patent/us/2546078/rogallo-wing-hang-glider) — A 1948 patent for a kite with a flexible, non-rigid wing that uses air pressure to maintain its shape during flight.
- [Igor Sikorsky's Early Design for a Vertical Takeoff Aircraft](https://patentbrief.org/patent/us/1994488/helicopter-sikorsky) — A 1935 patent by aviation pioneer Igor Sikorsky detailing a mechanical configuration for an aircraft capable of direct vertical lift.
- [Frank Whittle's Early Jet Engine Design](https://patentbrief.org/patent/us/2168726/jet-engine-whittle) — Frank Whittle's 1937 patent for an aircraft propulsion system using a gas turbine, which laid the foundation for modern jet engines.
- [How Early Numerical Control Systems Automated Industrial Milling Machines](https://patentbrief.org/patent/us/2820187/numerical-control-machine-tool-parsons) — A 1952 invention by John Parsons that used punched cards to automatically guide machine tools, effectively launching the era of computer-aided manufacturing.
- [How the Modern Frisbee Design Works](https://patentbrief.org/patent/us/3359678/frisbee-flying-disc) — A 1967 patent describing the specific aerodynamic shape and raised ribs that allow a plastic disc to fly straight and steady.