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DEFENSE · DESIGN

What Is SWaP-C?

SWaP-C stands for size, weight, power and cost. It is the design trade-off used in defense and aerospace to judge equipment for platforms with tight limits, such as drones and vehicles, where every gram, watt and pound spent reduces endurance, payload or budget.

01

The Short Answer

SWaP-C is shorthand for the four limits that decide whether equipment fits a platform: how much space it takes, how much it weighs, how much power it draws and what it costs. Engineers often drop the C and talk about SWaP when cost is handled separately.

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    Size Volume in the payload bay, rack or cabin, including room for cables and cooling.
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    Weight On a drone, every gram of payload trades directly against flight time and range.
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    Power The draw from the platform supply, and the heat that has to be removed without fans.
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    Cost Unit and lifecycle cost, including integration, qualification and spares.
02

Why It Matters

For edge AI, SWaP-C is why compact system-on-module platforms such as NVIDIA Jetson suit drones and vehicles: a single sealed computer replaces a rack of hardware. Our guide to choosing a Jetson companion computer for drones works through the trade-off, and the MILBOX-ORNX shows a low-SWaP design for smaller airframes.