<\/p>\n\n\n\n
Examples?<\/p>\n\n\n\n
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- Trailing edge flaps<\/li>\n\n\n\n
- Leading edge devices<\/li>\n<\/ul>\n\n\n\n
<\/p>\n\n\n\n
Principles? or Mechanisms?<\/p>\n\n\n\n
Everything is designed revolving around \u201clift formula\u201d , for example, movable trailing edge flaps can further divided into various categories:<\/p>\n\n\n\n
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- plain flaps, when they are extended ( by just pivot down), they increase the camber <\/li>\n\n\n\n
- split flaps, similar purpose<\/li>\n\n\n\n
- slotted flaps, used more on airliner, when they are extended, a slot will be created,
high pressure air from the bottom of the wing flows through the slot into the upper surface. This adds energy to the wing’s boundary layer<\/a>, delays airflow separation, and produces less drag. Of course, they increase the camber as well<\/li>\n\n\n\n- flower flaps, similar to slotted flaps, the difference is that they slide backward on tracks or rails before hinging downwards. This causes increasing wing\u2019s surface area<\/li>\n<\/ul>\n\n\n\n
<\/p>\n\n\n\n
What about leading edge devices?<\/p>\n\n\n\n
![\"\"](\"https:\/\/tommykwan.com\/blog\/wp-content\/uploads\/2025\/08\/13e351fc-ef47-4b3d-ab33-5f611a6390a8-17321-000005c74c5f83eb_file-1024x1024.jpg\")
<\/figure>\n\n\n\nthx for the internet, we can get the insights more easily, types of leading edge devices:<\/p>\n\n\n\n
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- fixed slot, as its name implies, it is static on leading edge. They are used as a mean of airflow management, by facilitating airflow over the wing, smoothing the flow and preventing separation (turbulence), which in turn increases CL<\/li>\n\n\n\n
- movable slat, the function is similar to the slot, but they can be retractable<\/li>\n\n\n\n
- Krueger flap, when they are deployed, the aerodynamic effect is similar to that of slats<\/a>; however, they are deployed differently. Krueger flaps are mounted on the bottom surface of the wing and are hinged at their leading edges. Actuators extend the flap down and forwards<\/strong> from the under surface of the wing thus increasing the wing camber which, in turn, increases lift<\/a>. <\/strong>The B747 has this device.<\/li>\n\n\n\n
- Leading edge droop, in movable form. They are deployed by hang down (droop) <\/strong>which increase the camber<\/a> of the wing and reduce the stalling speed<\/a>. For example, the Airbus A380<\/a> has droop flaps between the fuselage and each inboard engine, at the leading edge of the thickest part of each wing. The A350 has leading edge droop as well<\/li>\n<\/ul>\n\n\n\n
More references <\/p>\n\n\n\n
https:\/\/pilotinstitute.com\/flaps-types-explained\/<\/a><\/p>\n\n\n\n
<\/p>\n\n\n\n
- Leading edge droop, in movable form. They are deployed by hang down (droop) <\/strong>which increase the camber<\/a> of the wing and reduce the stalling speed<\/a>. For example, the Airbus A380<\/a> has droop flaps between the fuselage and each inboard engine, at the leading edge of the thickest part of each wing. The A350 has leading edge droop as well<\/li>\n<\/ul>\n\n\n\n
- flower flaps, similar to slotted flaps, the difference is that they slide backward on tracks or rails before hinging downwards. This causes increasing wing\u2019s surface area<\/li>\n<\/ul>\n\n\n\n