Maximum Distance v.s Maximum Endurance
August 2, 2025
星期六…下雨天…今日不做運動就又溫下書…每日一點點麻 … Best distance speed (Maximum distance speed) No matter we use distance and range to describe how far the aircraft can fly, we are literally talking about the horizontal distance that the aircraft can cover. Best Glide Speed? (Best Range speed when losing engines) When the aircraft lost its engine(s), the speed and configuration Read More
High Lift Devices
August 1, 2025
註冊後既呢個禮拜超充實，先係要招待外訪貴賓（LD)，又要做系統性風險評估既review, 再玩埋兩日車車，今日係時候準備返做飛機師，晨讀一下～ What’s High Lift Devices? High-lift devices are components on aircraft wings that increase lift, especially during takeoff and landing. Examples? Principles? or Mechanisms? Everything is designed revolving around “lift formula” , for example, movable trailing edge flaps can further divided into various categories: What about leading edge devices? thx for the internet, we can Read More
What’s AOI (Angle of Incidence)?
July 29, 2025
angle of incidence (AOI) is the angle between the wing’s chord line (an imaginary line from the leading edge to the trailing edge of the wing) and the aircraft’s longitudinal axis (a line running from the nose to the tail). It’s a fixed angle built into the aircraft’s design, unlike the angle of attack, which Read More
Standard Mean Chord (SMC)/ Mean chord line v.s Mean Aerodynamic Chord (MAC)?
July 29, 2025
SMC / Mean chord line often used in aircraft design, is a geometric parameter representing the average chord length of a wing. It’s calculated by dividing the wing’s surface area by its span, effectively representing the chord of a rectangular wing with the same area and span. While SMC relates to the wing’s overall geometry, Read More
What’s load factor (LF)?
July 26, 2024
The ratio between the lift produced by the wings (i.e., apparent weight) and the actual weight of the aeroplane is called the load factor (LF). Note: Load factors can be expressed in terms of the acceleration (on a body) due to the earth’s gravity (g) Read More
How to reduce induced drag?
July 26, 2024
Reference: Flying better: Winglets make aircraft quieter and more (facc.com) Reducing_Induced_Drag (centennialofflight.net) How to reduce induced drag? Winglet High aspect ratio wing Long span/short chord wing (high aspect ratio), the wing tip vortices are smaller because of the reduced airflow from the lower to the upper surface of the wing and therefore the Read More
Center of Pressure (CoP)
July 26, 2024
Center of pressure (CoP) is the point on the chord line of an aerofoil through which the total reaction acts on The angle of attack is increased, the centre of pressure on an cambered aerofoil moves progressively forward (towards the leading edge) – AoA increase, CoP moves forward! Read More
Total Reaction = Lift + Drag
July 26, 2024
Total reaction (TR) can be describe as the sum of lift and drag. Total reaction act on center of pressure (CoP) Read More
What’s Coanda Effect? [How aircraft wings generate lift?]
June 2, 2024
讀左Aviation 咁耐, 大家多數只係識用 Bernoulli principle 去解釋…固然無錯… 但不得不說…再學術少少, 吾好吾識 Coandă effect The Coandă effect (/ˈkwɑːndə/ or /ˈkwæ-/) is the tendency of a fluid jet to stay attached to a convex surface.[1] Merriam-Webster describes it as “the tendency of a jet of fluid emerging from an orifice to follow an adjacent flat or curved surface and to entrain fluid from the surroundings so that a region Read More
