發信人: jamewang (0939)    看板: Aero
日期: Sat May  8 18:55:06 1999
標題: Re: 不不知道對不對

==> 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".........
and got it's "cruise climb"to this level to save fuel......

--
* Origin: 國立中山大學 Formosa BBS-美麗之島 * From: 202.145.111.133 [已通過認證]
.