The terms “fuselage” and “airframe” are often used interchangeably to describe the body of an airplane. All fixed-wing airplanes have a body. The body serves as the physical structure. Technically speaking, though, fuselages and airframes are different. To learn more about these parts, including how they differ, keep reading.

What Is a Fuselage?

A fuselage is the middle body section of an airplane. It’s essentially the tube-like section that encompasses the passenger seats and cargo hold. Fuselages are often constructed of carbon fiber material or aluminum. Regardless, fuselages are the middle section of an airplane, and they are shaped like a tube.

Engines typically aren’t a part of the fuselages. Most airplanes have engines on their wings. And because the fuselage is the tube-like section in the middle of an airplane, engines aren’t included. The only exception is single-engine airplanes where the engine is in the middle and, thus, a part of the airplane’s fuselage.

Some of the most common types of fuselages include the following:

• Geodesic
• Truss
• Monocoque shell
• Semi-monocoque shell

What Is an Airframe?

An airframe, on the other hand, is the entire mechanical structure of an airplane. Airframes have been around since the early 1900s. The Wright brothers, in fact, pioneered the use of airframes in modern airplanes. An airframe is simply the mechanical structure of an airplane.

While they are available in dozens of different designs, most airframes include several common components. They include the airplane’s undercarriage, wings, engines and even its fuselage. All of these components form the airplane’s airframe.

Differences Between a Fuselage and Airframe

While they both represent the body of an airplane, fuselages and airframes aren’t the same. A fuselage is simply the tube-like body section of an airplane. It acts as a shell to contain passengers and cargo. An airframe, conversely, is the entire mechanical structure of an airplane.

An airplane’s fuselage is part of its airframe. Airframes include all mechanical structures. The fuselage, of course, is a mechanical structure, so it’s included in the airframe. Wings are included in an airplane’s airframe as well. In comparison, wings are not included in an airplane’s fuselage.

In Conclusion

Fuselages and airframes aren’t the same. Fuselages are the middle section of an airplane’s body, whereas airframes are the mechanical structure of an airplane. Fixed-wing airplanes have a fuselage and an airframe. The fuselage is simply part of the airframe.