কেন ল্যান্ডিং গিয়ার ভিতরে ঢুকিয়ে রাখা হয় | Why Do Airplanes Retract The Landing Gear After Takeoff 

All airplanes do not have to retract their gear; many planes are fixed-gear, and cannot retract gear. Some planes retract their gear. Planes can leave their gear deployed all through flight, provided they remain slow enough that the extra airflow drag doesn't damage the airplane and landing gear.
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