Cloud formation: Bergeron-Findeisen theory (Icing) v.s Coalescence theory (Water droplet)
July 20, 2025
https://youtu.be/6WjU0kwu_ew?si=Kvf5LqleDUzpKo8b Cloud Formation
Cloud Formation
July 20, 2025
https://youtu.be/q87Ekar3emA?si=EN2zl3qUX1OmIcsh Read More https://www.britannica.com/video/process-cloud-formation-factors-surface-air-water/-203821 Cloud formation: Bergeron-Findeisen theory (Icing) v.s Coalescence theory (Water droplet) Cloud formation 夠竟係吸定放latent heat? Clouds 雲
Oktas – reporting the amount of cloud in the sky
July 20, 2025
https://worldweather.wmo.int/oktas.htm Oktas Definition Category 0 Sky clear Fine 1 1/8 of sky covered or less, but not zero Fine 2 2/8 of sky covered Fine 3 3/8 of sky covered Partly Cloudy 4 4/8 of sky covered Partly Cloudy 5 5/8 of sky covered Partly Cloudy 6 6/8 of sky covered Cloudy 7 7/8 of
How Does Autopilot Work? A Pilot Explains What It Can and Can’t Do
July 20, 2025
https://www.wsj.com/video/series/travel-guides/how-does-autopilot-work-a-pilot-explains-what-it-can-and-cant-do/1C1E2CD3-92E3-420F-927B-5A4026A3E412?mod=hp_featst_pos5
點解ATIS 要點Temperature and Dew Point?
July 20, 2025
今日打風溫書…簡接溫故知新~ 下面有個ATIS 實例…有T 28 /DP 26 要推算Cloud Base = T-DP * 400 = (28-26)*400 = 2* 400 = 800 feet AGL 再反推Relative Humidity (RH) = 100 – (T-D) *5 = 100 – (28-26) * 5 = 100 – 10 = 90% 呢兩條Rule of thumb 係work 既~
Calculation of Freezing Height
July 20, 2025
The Bradbury Rule Example: OAT 10 degree C ; DP 7 degree C Calculate Cloud Base T – DP * 400 = (10-7) * 400 = 1200 feet AGL Calculate Freezing layer DP / 1.8 * 1000 = 7/1.8 * 1000 = 3889 feet AGL Freezing height 1200 + 3889 = 5089 feet AGL This
How to find the Dew Point? How to find Relative Humidity (RH)?
July 20, 2025
How to find the Dew Point? RH = 100 – (T-D) x 5 Example: RH 83% ; Temp 12C, then 83 = 100 – (12-D) x 5 (83-100) / (-5)= 12-D D = 12 – (83-100) / (-5) D = 8.6 degree C Rightly, we can interpret the relative humidity (find the RH) from
Dew Point Application – Calculate Cloud Base
July 20, 2025
Degree C Let’s say the temperature is 25°C and the dew point is 15°C. Convergence Rate (CR) = 2.5°C Temperature Dew Point Spread (TDS) = T-DP = 25 – 15 = 10°C TDS ÷ CR = 10 / 2.5 = 4 Multiply by 1000 = 4 * 1000 = 4000 feet Therefore, the estimated cloud
Dew point, Dew Point Spread
July 20, 2025
What’s Dew Point? Dew point, given in degrees, is the temperature at which the air can hold no more moisture. When the temperature of the air is reduced to the dew point, the air is completely saturated and moisture begins to condense out of the air in the form of fog, dew, frost, clouds, rain,
ISA Deviation
July 20, 2025
Example: FL290 ; OAT -47 degree C ISA standard = 15 – (feet /1000) * 2 ISA Deviation = OAT – ISA standard FL 290 : 29,000 feet, so ISA standard @ FL 290 = 15- (29*2) = -43 degree C ISA deviation = -47 – -(43) = ISA-4 degree C https://youtu.be/_oWqu12Dm6M?si=eUYvJoTQD_EOKKl2
Thermodynamics: Radiation, Conduction, Convection & Advection
July 20, 2025
https://youtu.be/0vdxlgRKx1k?si=a80FzWfEp2fsKj2K What’s Solar insolation?
Tropopause
July 20, 2025
What’s Tropopause? https://youtu.be/jTCWSjhhXgc?si=9Zf8eVJgx6TKOXDs Tropopause height and its significance? https://youtu.be/ZfGVHCJSDsw?si=qaqwuN4DSlX6uyiu https://youtu.be/dRI5gYrJmvo?si=NHQo3NtST_5f-9ei More Reference: https://code7700.com/tropopause.htm
Spiral Dive v.s Spin v.s Dutch Roll
July 12, 2025
好耐無溫書…係時候準備! 今日朋友講起呢兩個TOPIC…就睇下啦~ XDDD Spin Stall -> Spin (autorotation) BOTH wing stall, but one wing stall more -> i.e uncoordinated stall / imbalanced stall 3 Phases (2 mins 36 sec) Incipient Spin Fully developed Recovery Feature slow airspeed at fully developed stage + high AOA Factors affecting spin recovery Weight & Balance -> CG aft, more
Air India crash : comment and discussion by Firstpost
July 1, 2025
https://youtu.be/dKeSj46pzng?si=X9U1pcfLMhu-jD4T d英文都幾易聽 內容都充實 對事情做個初步評估推論外 又有提到一班機pf 同 pm 既分別、 CVR 同 FDR 既分別 值得bookmark
Forward CG or Rearward CG?
June 15, 2025
好耐無溫書，曾經作為load control，一定會比人問同埋要考慮load頭定load尾好，by rule of thumb, 我果陣普遍幫佢裝頭，點解？ 係時候溫返書～ 一齊睇下AI分析先： Forward CG: https://youtu.be/a_33vmrV52s?si=WwrMtjkikczUpT3e Aft CG: In Summary: While a forward CG might be considered safer due to increased stability, pilots must balance this with the potential for increased drag and stall speed. Understanding the effects of both forward and aft CGs is crucial for safe and efficient flight
Aircraft Approach Categories: The What, Why and How
December 27, 2024
好耐無睇AViation 既野，今日見到篇文章吾錯： https://navigraph.com/blog/aircraft_approach_categories?utm_source=newsletter&utm_medium=email&utm_campaign=2413_n&utm_content=aircraft_approach_categories the aircraft’s indicated airspeed above the runway threshold (VAT speed). This, in turn, is equal to the highest value of the stall speed (VS0) multiplied by 1.3 or stall speed at 1G (Vs1g) multiplied by 1.23 of an aircraft in a normal landing configuration at its maximum certified landing mass. ICAO (the International
Back to basic: Law 法例
October 1, 2024
今日就黎對比一下香港,澳洲, 美國既航空例~ 香港 (Hong Kong) 香港既法規有主體條例 (Ordinance) 同子規例 (Regulations)… 係DOJ e-legislation 可以搵到相關既法規 (我統稱叫 「例」) https://www.elegislation.gov.hk/index/chapternumber?TYPE=1&TYPE=2&TYPE=3&LANGUAGE=E&p0=1&CAP_NO_FR=447&CAP_NO_TO=449 1 條主體條例 ; 7 條子法規 448 Civil Aviation Ordinance 448A Air Transport (Licensing of Air Services) Regulations 448B Hong Kong Civil Aviation (Investigation of Accidents) Regulations 448C Air Navigation (Hong Kong) Order 1995 448D Hong
