發信人: jamewang (0939)    看板: Aero
日期: Sun May  9 12:47:19 1999
標題: Re: 不不知道對不對

==> jamewang (0939) 的文章中提到:
>==> jamewang (0939) 的文章中提到:
>>==> mewinfred (快餐車寶寶) 的文章中提到:
>>>   今天上課有聽老師說到"cruise climb"
>>>   是不是有關巡航爬升的東東呢???
>>>   不知道我的解釋有沒有錯~
>>>   C=CL*0.5*ρV**2
>>>   CL,V都固定~~那麼要保持平衡的話只有ρ變小~
>>>   因為我們住在地球~受地心引力的影響~所以大部份的空氣分子都在下面~
>>>   那麼越上面的空氣壓力就小密度小~
>>>   如果要T=D,L=W,但是飛機飛行油量一定會少掉很多~
>>>     所以要保持平衡就只能改變ρ~~
>>>   那就是要升到上面~普通民航客機從35000ft~42000ft
>>>   就是慢慢爬升~是不是這個因素呢???
>>>   呵呵~我解釋的有點不好~還希望各位先進能再幫小弟註解一下~
>>>      謝謝~~
>>yeah ...you are right ..that you must to climb higher to save your fuel..
>>but it's not  unlimit to climd high......if you climbing to higher , 
>>you 'll waste your fuel more and in too high flight level , there is 
>alittle air and you need to spand more fuel to gain air speed.....
>so in exactly , you should fly high to save your fuel but not too high .
>every plain got it's "cruise level","cruise speed"and.........
> "cruise climb"to this level to save fuel......
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