Construction parts? What I mean with construction parts: As you know every car has a frame / chassis, so has an airplane (and the smaller version; drone). This frame is build out of hundreds of different parts, bigger parts and smaller parts. The most crucial parts are in places where main body-parts are connected: Wing-body, engine-wing, ailerons-body, etc. For example the engine is connected to the wing with brackets (will probably 3D printed very soon) When you take a look at those airplane frames, you will understand what I mean. http://www.hunterverein.com/userfiles/downloads/huntercutaway.png
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