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Re: Re: Re: Re: starship-design: Re: Perihelion Maneuver
>In a message dated 11/27/97 3:09:43 AM, email@example.com wrote:
>>That is a big deal! Do you have any idea how to do VLBI with
>>If so, there's a Nobel Prize waiting for you.
>>We can do VLBI with microwave wavelengths because it's just barely
>>possible to measure phase with them (and thus possible to receive
>>multiple signals and constructively interfere them appropriately).
>>We _can't_ do VLBI with infrared and shorter wavelengths. It _might_
>>be possible to do it in the future, but don't bank on it.
>Actualy we do currently do VLBI with optical ground telescopes, and NASA is
>tinkering with a project to scatter 1 meter drone scopes across an area of
>hundreds of miles of lunar surface.
We do LBI with optical ground telescopes. So far as I know, VLBI is
impossible with known technology.
The V in VLBI stands for "Very". What that means is that the elements
are so far apart that they aren't rigidly locked wrt to each other
within the tolerance of about 1/4 the working wavelength.
The moon's surface provides a very stable nearly rigid "structure"
to lock a bunch of elements wrt to each other, but this isn't necessary
>>>>> Or funding sources that much more patent? If it take a half
>>>>>century to get results, a inteligent person will wait a couple
>>>>>decades for faster cheaper systems.
>>>>Not if those "faster cheaper" systems aren't going to be much faster or
>>>When have we not developed much better systems after a few decades?
>>For instance, automobiles. Automotive technology has gotten a bit
>>better, but a 1960's Cobra can race competetively with anything
>>we can build today of similar weight/size. A 1940's Volkswagon
>>is still one of the most fuel efficient vehicles you can drive.
>>Cars are a bit better, but not outrageously better, than several
>Cars speeds are governed by highway speed limits.
Not on the racetrack.
>Unrestricted the max speed
>for a car a hundred years ago was tens of miles per hour, just recently
>supersonics (700+) were runing.
Not on the racetrack.
Admittedly there was a vast improvement in automotive technology
between 100 and 50 years ago. However, since then improvement
has largely leveled off.
>Oh and gas milage and the rest for cars a decade or so old are fairly bad by
>current standards. (Top fuel efficent cars from the dealership can get up to
>100 mpg, thou few are very drivable.)
Anyone knows that car fuel efficiency depends upon the car's
size/weight. Comparing cars of equivalent size/weight, we haven't
improved gas mileage much.
Well, since you seem unconvinced by what I deemed a blatant example,
I'll give another--small arms. Today's military small arms don't
significantly outperform those from 40 or 50 years ago except in
_____ Isaac Kuo firstname.lastname@example.org http://www.csc.lsu.edu/~kuo
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