Why turbofan engine needs High bypass ratio? 點解要high bypass ratio?
June 1, 2024
Force = mass x acceleration [Ref Turbofan Engine | SKYbrary Aviation Safety] High bypass engines usually have a single stage fan which generates a high volume but relatively low speed air stream. The fan airflow, referred to as the cold air stream, is accelerated by the fan and passes through the engine remaining outside of
Why aircraft fly SO HIGH? 點解民航機要飛高D?
June 1, 2024
To answer this question, there are various approach. Weather Speed (Lift formular – air den v.s TAS) Efficiency of the engine Read More – Why Are Jet Engines More Efficient at Higher Altitudes? – HighSkyFlying
Carbon Fiber Composite (CFC) , Ceramic Matrix Composite (CMC)
May 27, 2024
CMC More about CMC: Behind the GE9X engine’s advanced technologies | Paid content | Flight Global CFC
Break Horsepower, Thrust Horsepower – BHP vs THP?
May 27, 2024
Definition of Horse Power (Break Horsepower) – refer below BBC youtube footage 5:14 Read more – Be caution ! 有出入 For below video, you may hear something a bit different, but the author mentioed that the clip below are on US basis.
Reliablity of B777 Electrical System – This Can Save An Airplane | Engineering Secrets
May 26, 2024
#IDG x2 – AC generator #APU #ELMS – Electrical Load Management System #Backup generator x2 #PMG x4 – Permanent Magnetic Generator #Battery #RAT -Ram Air Turbine #Emergency Battery
What’s Tropical Cyclone (Typhoon)?
May 26, 2024
Tropical cyclones is one of the natural hazard for aviation. How do we call them depending on the region. According to WMO (World Meteorological Organization): [Ref Tropical cyclone (wmo.int)] A tropical cyclone is a rapidly rotating storm that begins over tropical oceans, and they can vary in speed, size, and intensity. Tropical cyclones are the
What’s Foehn effect 焚風效應?
May 26, 2024
Ref Foehn effect – Met Office The foehn effect describes the change from wet and cold conditions one side of a mountain, to warmer and drier conditions on the other (leeward) side. Note: Latent heating (LH) arises predominantly from the release of heat associated with the condensation of water vapor into cloud droplets in clouds
What’s Lee side?
May 26, 2024
Ref Windward and leeward – Wikipedia The term “windward” has roots in both Low German and Old English. The word “lee“, which means a place without wind. Windward is upwind from the point of reference, i.e., towards the direction from which the wind is coming; Leeward is downwind from the point of reference, i.e., along the direction towards
How the air pressure work in our environment?
May 26, 2024
By change, I stumble upon a series of televsion show, which use animation to explain Meteorology in a easy way. Great!
Cloud Base v.s Cloud Ceiling
May 25, 2024
A cloud base refers to the lowest visible part of the clouds over the station. A cloud ceiling refers to the distance between the ground or water and the base of the lowest layer of clouds, which must form a cloud cover that blankets more than half of the sky below 20,000 feet. Read More –
