Because they can find a lot of information about it's flight characteristics in wind tunnels.
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Engineers put very accurate models of new airplanes in wind tunnels to see how aerodynamic they are.
They use models to test their designs of new technologies.
A subsonic wind tunnel is a wind tunnel that cannot take testing to Mach 1 (the speed of sound). There are a wide variety of wind tunnels, and they come in a broad range of sizes, too. They span models from ones that test motorcycle helmets to ones that test a whole small aircraft or aircraft model. A link is provided to the Wikipedia article on the wind tunnel, and you'll find that link below.
A radar engineer works with radar. They have design, develop, install, and test a radar.
Businesses hire social engineers to test flaws in their business security policy so that the business may correct these flaws before someone exploits them for profit.