Skid and Slip (on rolling)
通常講skid and slip, 我地都好易聯想起在turn 既時候uncoordinated turn 果個 skid and slip…但實際在rolling 既時候都可能有skid and slip…今日又做下溫習~ 我地知道skid and slip係有分別…但點解家下普通airliner 配備既係”anti-skid system” 而不是”anti-slip system”? 呢個問題係幾有趣…首先…我地要從學揸車開始! Understeer (推頭) = Slip Oversteer (甩尾) = Skid Ball-out Skid Ball-in Slip 之後就要睇下下面呢條片2:39 當braking force 增加到某個程度就會引致Skid (而在飛機進入Skid 之前一定會有一斷slip既時間…但Slip 反而有助stopping the aircraft!) https://youtu.be/TQrBwJWzmAc?si=2as89SBGnTdyz0X7 要睇下家下D飛機既設計! https://youtu.be/vZmS661zijo?si=KGdV4sVmJrRthnP2 https://youtu.be/F3uqUDGKsZQ?si=DH8Zuk60jZdJsyQe Btw…turning after airborne 果個skid and
溫故知新之飛機BRAKE!
過去好似收集過吾同Brake 有關既post…不過好似有D亂…今日一早就睇下吾同”交通工具/載具”既Brake! Private Car: Disc Brake by normal spring mechanism! Bus and Truck : Drum / Disc brake power by compressed air! General Aircraft : disc brake powered by Hydraulic (but only a master cylinder)! B777, A350 : Carbon Fibre Brakes (disc brake) powered by Hydraulic! B787, A220 : electrically activated braking system – electro-mechanical
巴士貨車同一般私家車既剎車原理吾太一樣: 巴士貨車用 Air Brakes! How’s Air Brake Works?
How Air Brakes Work in Trucks https://youtu.be/fbT_MFZLP9s?si=bYdXVGqumvyWzEqB https://youtu.be/twuO2tsuNKo?si=x-O9COMQhN_N5L5n https://youtu.be/dMxilatT0qw?si=Li_H8RB38PvDah_w
Wingtip device : winglet v.s wing fences
https://youtu.be/zWjrEGkpqiE?si=pY-v4dWnjAD7BzBl https://youtu.be/FNqXf6t7e-w?si=0DLCW8ZPclADGnIH
Folding wingtip 777-X
https://youtu.be/K9k0Y8t9NOU?feature=shared https://youtu.be/y_9gUT2Tk8o?si=0e2sjnahm6EBZnIB https://youtu.be/RcpL7wzYRng?si=c2J_lCPNqNHHhIsm
Types of Precipitation?
今日又溫下書…到底有咩類型既precipitation? 首先， what’s precipitation? 根據FAA PHAK chapter 12 (天氣果課書）： Precipitation refers to any type of water particles that form in the atmosphere and fall to the ground. 睇返之前 收集既一個wmo網頁，天氣現象大致分為：水、光、電、塵相關 Types of meteors (WMO) 而同水有關既可以睇呢個網： https://cloudatlas.wmo.int/en/hydrometeors.html Precipitation 係指 11類 falling particles (b) Falling particles (precipitation) 1. Rain : water droplets, but not drizzle
Change status of water
#Solid #liquid #gas #melting #evaporation #condensation #freezing #sublimation #deposition
點解會落雹 What’s hail?
話說琴晚黃昏就收到天文台特別天氣提示話會落雹可能，難道有冤情？ 🙂 都可能係 就係點解我仲未做到飛機師 因為我讀書未夠？ 咁就溫下書～ Hail is formed in strong thunderstorms when supercooled water droplets freeze onto ice pellets, which are then carried by powerful updrafts within the storm cloud. These ice pellets, or hailstones, grow larger as they repeatedly collide with more supercooled water droplets, eventually becoming too heavy to be supported by the updraft
Learn from mistakes: Plane crashes into the Mountain
每日學一點點 加油💪🏻 https://youtu.be/11WD64pgyH8?si=XI9gMslExoakfYz- AI summary : American Airlines Flight 965, a Boeing 757, crashed into a mountain near Cali, Colombia, on December 20, 1995, resulting in 151 fatalities. The primary cause was pilot error leading to the aircraft deviating from its intended approach path and impacting terrain. Contributing factors included crew misinterpretations of flight management system (FMS)
Cloud formation: Bergeron-Findeisen theory (Icing) v.s Coalescence theory (Water droplet)
https://youtu.be/6WjU0kwu_ew?si=Kvf5LqleDUzpKo8b Cloud Formation
Cloud Formation
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
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
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?
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
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)?
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
