Why does the Boeing 737 not have any landing-gear doors?

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Have you ever seen a Boeing 737 take off and noticed that the wheels are still visible after the gear has been retracted?
In this video I will tell you all about the reason for this, the aerodynamic impact and some protection systems that you might not know about.
Enjoy!

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Видео Why does the Boeing 737 not have any landing-gear doors? канала Mentour Pilot