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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.
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 ...
English: Landing gear of an aircraft, schematic view of the retracting mechanism. Filled circles are fixed relative to the airframe. Coloured arcs denote the locus of points. 1 Hydraulic Ram 2 Hinge Mechanism 3 Strut 4 Wheel Boss 5 Wheel . 6 Fuselage/Wing
The electrically powered tricycle landing gear was attached to the center spar. The pair of General Electric J31 turbojets were positioned under the wing roots in streamlined nacelles. The armament was located in the nose of the aircraft; two of the three XP-59As and most of the YP-59As had a pair of 37-millimeter (1.5 in) M10 autocannon.
In February 1945, the Council of People's Commissars ordered the Mikoyan-Gurevich (MiG) OKB to develop a single-seat jet fighter to be equipped with two German BMW 003 engines. Intended to destroy bombers, the aircraft was to be equipped with a single 57-millimeter (2.2 in) or 37-millimeter (1.5 in) gun, plus two 23-millimeter (0.9 in) guns.
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.
The narrow-track main landing gear retracted rearward entirely within the fuselage. To minimise the use of strategic materials, the aircraft was of mixed steel and wood construction, with a plywood-covered molybdenum steel tube fuselage covered by moulded plywood panels, and wings with welded steel spars and ribs covered by plywood.
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.