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Aeronautical Engineering/Retractable mechanism for Landing gear in airplanes.


Dear Paul

Are the Landing gears always retractable in all airplanes ?.


Once the airplanes takes off, the front and rear wheels are always
folded ?.
Once the airplanes wants to Land, the front and rear wheels are unfolded ?.

What are the Pros and Cons with and without having these retractable mechanism for Landing gears in airplanes ?.

Thanks & Regards,
Prashant S Akerkar

All commercial aircraft have retractable landing gear with a few exceptions such as float planes and helicopters. Many small aircraft have fixed landing gear. Fixed landing gear generate drag, which limits speed and range. But they are simple. Retractable landing gear are more complicated, expensive, and require special structure and actuators that add weight to the aircraft.

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Paul Soderman


Aeronautics, Aerodynamics, Fluid Mechanics, Aeroacoustics, Noise Control, Muffler Design, Wind Tunnel Research.... I know nothing about India - do not ask about schools, jobs, application requirements, career choices, etc. for India. Please, no text message verbiage; I prefer full words in full sentences. Thanks.


38 years as research engineer at NASA


B.S. and M.S. Aeronautical Engineering - U. of Washington, Graduate work Standford U.

Awards and Honors
AIAA Associate Fellow (American Institute of Aeronautics and Astronautics)

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