有趣視頻之： 點解飛機引擎有d small holes ?
August 7, 2025
Normal aspirate vs Turbocharger Engine?
August 7, 2025
今個早上繼續努力 讀書 我要做飛機師 🙈 首先，engine air induction 空氣有分normal aspirate and turbocharger 之後，就算turbo engine 都再分 supercharge and turbocharge, let’s get started 🙃🤪 Turbo vs Supercharger 先睇車既 https://youtu.be/DhTxCA65KWo https://youtu.be/iS0XxIcdcu4 再睇飛機既 https://youtu.be/o_MQ-5-Gii8 https://youtu.be/Xp0Vx8rVISc
Engine Detonation & Pre-Ignition
August 4, 2025
今日溫書…繼續Engine先~ 睇一下上年差吾多時間既發文…再收集一下新野: 溫故知新~ 我要揸飛機 XDDD 有一句說話好真…書第一次讀係知…第二、三、四、五次讀先會識…以前我真係讀書…知道佢UP咩…但未識…今晚一個人安靜下…睇返之知自己入左誤區都吾知 >3<” 今晚就一文搞清楚某D Terms 既分別! Reciprocating Engine v.s Turbine Engine Reciprocating and turbine engines differ primarily in their mechanism for converting fuel energy into motion. Reciprocating engines use pistons that move back and forth in cylinders, converting combustion pressure into rotational motion. Turbine engines, on the other hand, use
Disk brake (Disc brake)
September 8, 2024
Modern general aircarft (GA) and airliner are also use disc brake Types of disk brake (disc brake) Singel disc Multi-disc Composition of disc? Steel Carbon Modern airliner tends to use carbon multi-disc. Advantage of disc type actuator? more effective at slowing or stopping improve the issue on drum brake (less fading problem) light
Drum brakes
September 8, 2024
Drum brake – not used on modern aircraft Basic component of drum brake? Drum – the moving part ; A hollow, cylindrical metal component that is attached to the wheel hub and rotates with it. It is the surface against which the brake shoes press to create friction. Brake shoes – the static part ;
民航機的空調系統
August 25, 2024
Function of air condition system improve passenger comfort – air conditioning ventilation – exchange fresh air maintain cabin pressure Component of air conditioning system? B777/A350 for example – Bleed air (from APU/Engine) -> Primary heat exchanger ->air cycle machine (compressor) -> Main heat exchanger -> air cycle machine (Turbine) -> Water separator -> Mixer
Two spools v.s Triple spools
August 4, 2024
References: Difference between Two Spool Engines and Three Spool Engines – FlyFA Aircraft Maintenance Engineering 3-Spool-Engine Concept | aircraftengineering (wordpress.com) What is triple spool design on the RB211? what are the advantages/disadvantages? A 3 spool engine is one that has three sets of compressors before the combustor and three sets of turbines behind it. A
Cooling Methods in Turbine Blades
August 4, 2024
Reference: Cooling Methods in Turbine Blades | Turbomachinery blog (softinway.com) thermal barrier coating on the turbine blade (Blade Passive Protection) internal cooling – maintains the blade metal temperature below the outside gas temperature by heat transfer to internal cooling air – include convection cooling and impingement cooling, where cooling air runs through channels within the
[GA piston engine] What’s full throttle height?
August 3, 2024
Full throttle height – Depending on the power setting, as an aircraft climbs (fitted with a fixed-pitch propeller), a height is reached eventually where the throttle will be fully open to maintain that power setting. Important concept: An aicraft can have various power setting! Each power setting has a full-throttle height! Read more
[GA Piston Engine] Effect of Increasing Height on Power Output
August 3, 2024
(On a ‘standard’ day) Aicraft climbs / fly high –> output of the engine decreases for two reasons: decrease in atmospheric pressure – reduces the manifold pressure and thus the flow of air into the cylinders (a similar effect to closing the throttle) – can be compensated for by progressively opening the throttle decrease in
Too lean, Too rich, CCM, Best power, Best economy
August 3, 2024
Notes: The carburettor measures the weight of air passing through the induction manifold and uses this measurement to regulate the amount of fuel discharged into the air stream (according to a predetermined schedule). What’s rich, lean and CCM? Rich: 1:8 Chemically Correct fuel/air Mixture (CCM): 1:15 Lean: 1:20 In theory, the ‘correct’ quantity
What’s Feathering? (Propeller)
July 21, 2024
Ref untitled (cast-safety.org) 原文: “On a variable pitch propeller, the drag can be minimized by rotating the blades until they are edgewise to the flight direction. This is called feathering the propeller.” Why we need “feathering the propeller”? / When we need to “feathering the proeller”? When an engine is shutdown in flight, an
