點解客機要在三萬尺高空飛行?

點解客機要在三萬尺高空飛行?
**** lower air density, less air ==> less drag ===> less fuel required.
The engines are design to work most effectively at high attitude.


低d唔得?
**** 得, but will use more fuel. do you remember the low flypass of A380 (at1000ft) in 2007?

2012-07-31 17:26:50 補充：
你飛得坅高遇到既風就會少啲.
**** Wrong, the wind is even strong. You heard of Jetstream?

私人飛機有啲可以飛到50000呎高空
**** 私人飛機 = ? Cessna? Censsa doesn't have a pressurised cabin, and it can reach ~8000ft only.

低啲唔係無問題.但係你低啲既話遇到既風就會多啲.一係順風一係逆風.你飛得坅高遇到既風就會少啲.用少啲油.同埋細啲既飛機就會飛得高啲同埋飛機坅細就坅安全.所以私人飛機係好安全同可以飛得好高.私人飛機有啲可以飛到50000呎高空

慳油!!!!!!!!!!!!!!!!!!!!!!