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The landing gear represents 2.5 to 5% of the maximum takeoff weight (MTOW) and 1.5 to 1.75% of the aircraft cost, but 20% of the airframe direct maintenance cost. A suitably-designed wheel can support 30 t (66,000 lb), tolerate a ground speed of 300 km/h and roll a distance of 500,000 km (310,000 mi) ; it has a 20,000 hours time between overhaul and a 60,000 hours or 20 year life time.
An oleo strut is a pneumatic air–oil hydraulic shock absorber used on the landing gear of most large aircraft and many smaller ones. [1] This design cushions the impacts of landing and damps out vertical oscillations.
Aircraft Wheels and Configuration Nose section Center section Example 717, 727, 737: 6 wheels [1x2]+[2x2] A Boeing 737 from Southwest Airlines: 747: 18 wheels [1x2]+[4x4] A Boeing 747-400's main landing gear. Note the toes-up bias angle of the bogies on the wing gear, to ensure correct stowage upon retraction: 707, 720, 757, 767, 787: 10 wheels ...
Maximum landing gear operating speed. This is the maximum speed at which the landing gear on a retractable gear aircraft should be extended or retracted. [7] [9] [20] V LOF: Lift-off speed. [7] [9] V MC: Minimum control speed. The minimum speed at which the aircraft is still controllable with the critical engine inoperative. [7]
The aircraft design process is a loosely defined method used to balance many competing and demanding requirements to produce an aircraft that is strong, lightweight, economical and can carry an adequate payload while being sufficiently reliable to safely fly for the design life of the aircraft.
Conventional landing gear, or tailwheel-type landing gear, is an aircraft undercarriage consisting of two main wheels forward of the center of gravity and a small wheel or skid to support the tail. [1] [2] The term taildragger is also used. [2]
An aircraft ground carriage (also "ground power assisted takeoff and landing concept") is a landing gear system connected to the ground, on which aircraft can take off and land without their aircraft-installed landing gear. [1] The technical feasibility of the ground carriage is being investigated by two research groups.
The Grumman FF "Fifi" (company designation G-5) is an American biplane fighter aircraft operated by the United States Navy during the 1930s. [2] It was the first carrier aircraft with retractable landing gear. [3] It was produced under licence in Canada and known as the Goblin in Canadian service and Delfín (English: "Dolphin") in Spanish service.