Props for your little RC airplane or drone are effectively consumables ... The next trick is turning that single blade into a propeller. This is done with a cleverly machined hub, attached ...

An curved arrow pointing right. An entire airplane isn't built in one spot — sometimes parts are built in multiple places and then assembled together. Watch Boeing transport a massive 100' long ...

Especially if the airplane has a motor ... single piston and runs on compressed air. The reduced parts count is a result of using the propeller axle as a key component in the engine itself.