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Every electrical system inside a drone needs power, and delivering it normally means running wires through wings, fuselage sections, and other structural components. Those cables need connectors, attachment points and protected routes, adding weight and complexity to aircraft where internal space is already limited. They can also create additional maintenance points when something needs to be repaired.
A U.S. Navy-backed project is exploring whether some of that wiring can become part of the aircraft structure itself.
Continuous Composites has received a Phase II Small Business Innovation Research contract to develop 3D-printed composite UAV components with electrical conductors embedded directly inside them. The goal is to create load-bearing structures that can simultaneously distribute electrical power.
The project uses a manufacturing process called Continuous Fiber 3D Printing (CF3D). Unlike conventional polymer printing, the process places continuous reinforcing fibers as a component is manufactured. Engineers can control where those fibers and other materials sit inside the finished part, allowing different functions to be incorporated during printing.
During the first phase of the project, researchers produced fiberglass-reinforced panels containing copper wires and fiber-optic elements. Mechanical tests examined whether embedding those components compromised the strength of the composite. According to the company, the additional materials had minimal impact on structural performance, while electrical testing demonstrated the basic feasibility of the concept.
Phase II will move toward higher-capacity electrical pathways suitable for more demanding applications. According to Interesting Engineering, one challenge will be positioning and insulating conductors so that they can carry power without creating weak points in components that must also withstand mechanical loads.
Testing will initially involve small material samples, known as coupons, before progressing to sub-scale structures.
If successful, the technology could simplify the architecture of military drones. Conventional wiring harnesses require dedicated routing throughout an airframe and can contain numerous connectors. Embedding conductors could reduce some of those separate components while freeing internal space for batteries, sensors or other payloads.
Maintenance could change as well. A multifunctional structural component might eventually be replaced as a single unit rather than requiring technicians to remove the structure and then disconnect or reroute separate wiring assemblies.
That could be particularly useful for military UAVs, where fast repairs and high availability are important during sustained operations. Fewer exposed connections could also reduce potential points of damage during handling and maintenance.
The 30-month Phase II program will focus on materials, manufacturing processes and conductor integration. A subsequent one-year option could lead to a system-level demonstration using a functional component.
The concept remains at the development stage, so it is too early to know how much conventional wiring could realistically be eliminated. But the project points toward a broader change in aircraft manufacturing: instead of printing a component that only carries mechanical loads, future structures could leave the printer already equipped to carry power and data as well.
