t********t
发帖数: 1070 | 1 这是美国登月之父Wernher Von Braun在他1953年的书《Conquest of the Moon》中的
一段话：
...
It is commonly believed that man will fly directly from the earth to the
moon，but to do this, we would require a vehicle of such gigantic
proportions that it would prove an economic impossibility. It would have to
develop sufficient speed to penetrate the atmosphere and overcome the earth'
s gravity and, having traveled all the away to the moon. It must still have
enough fuel to land safely and make the return trip to earth. Furthermore,
in order to give the expedition a margin of safety, we would not use one
ship alone, but a minimum of three. Calculations have been carefully worked
out on the type of vehicle we would need for the nonstop flight from the
earth to moon and return. The figures speak for themselves: each rocket ship
would be taller than New York's Empire State Building (1250 feet) and with
about ten times the tonnage of the Queen Mary, or some 800,000 tons!
From the space station's orbit, however, a journey to the moon becomes
feasible. In the orbit we can construct the type of vehicles we require for
the lunar trip, in the same way that we can build the space station. These
vehicle will already have a speed of 15,840 miles per hour - the speed of
the space station as it moves around the earth. Since we have this running
start, we will...
如果冯布朗‘carefully worked out’的计算是正确的，那么美国登月时的技术进步已
经超过了科技神话：土星5把火箭高度从1250 feet减到了363 feet,把80万吨减到了
3000吨。
这个世界，总是有什么地方好像是被扯了蛋的。 | l**m
发帖数: 88 | 2 是不是被你略过的 however 后面那段就是解释如何从80000吨减到3000吨的呢?
to
earth'
★ 发自iPhone App: ChineseWeb 8.2.2
【在 t********t 的大作中提到】
: 这是美国登月之父Wernher Von Braun在他1953年的书《Conquest of the Moon》中的
: 一段话：
: ...
: It is commonly believed that man will fly directly from the earth to the
: moon，but to do this, we would require a vehicle of such gigantic
: proportions that it would prove an economic impossibility. It would have to
: develop sufficient speed to penetrate the atmosphere and overcome the earth'
: s gravity and, having traveled all the away to the moon. It must still have
: enough fuel to land safely and make the return trip to earth. Furthermore,
: in order to give the expedition a margin of safety, we would not use one
| n*********7
发帖数: 4682 | 3 米帝去月亮是直飞还是分段的？
【在 l**m 的大作中提到】
: 是不是被你略过的 however 后面那段就是解释如何从80000吨减到3000吨的呢?
:
: to
: earth'
: ★ 发自iPhone App: ChineseWeb 8.2.2
| b***y
发帖数: 14281 | 4 显然不是啊。however后面说的事如果从空间站出发的情况，和阿波罗没关系。
【在 l**m 的大作中提到】
: 是不是被你略过的 however 后面那段就是解释如何从80000吨减到3000吨的呢?
:
: to
: earth'
: ★ 发自iPhone App: ChineseWeb 8.2.2
|
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