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Aeronautical Engineering/Retractable mechanism for Landing gear in airplanes.

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Question
Dear Rajeev

en.wikipedia.org/wiki/Landing_gear

Are the Landing gears always retractable in all airplanes ?.

i.e.

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

Answer
All modern airplanes are fitted with retractable landing gears.

For older generation design's & smaller aircraft's like single seaters & trainee small capacity planes, whichever does not fly higher altitude, fixed landing gear is sometimes used.

Advantage of retractable landing gear  include lesser drag during level flights, fuel economy, aerodynamic efficiency etc...

Disadvantages include excessive coeff of drag, manoeuvering during landing, fuel wastage for international flights etc...

U can refer reference books for more information.

Aeronautical Engineering

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Rajeevlochanam B A

Expertise

structural design analysis of aero gas turbine engine ; strength, life and integrity, Careers

Experience

stress analysis of rotating parts; Discs and shafts material selection and mechanical property

Organizations
aerospace industry

Publications
Journal of Aeronautical Society of India (AeSI Journal), India National Seminar on Aerospace Structures (NASAS), India National conference on air brathing engine (NCABE), India ANSYS(India) Users confefence, National Seminar on Flight Testing, India

Education/Credentials
BTech (GRADUATION in Mechanical Eng),mysore university, india MTech (Post Graduation in Engineering Mechanics) iit-m, India MBA (HRM) IGNOU, India

Awards and Honors
Life Member of Aeronautical Society of India Life member Alumni association of Indian Institute ofTechnology, Chennai, India

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