(Paul Spielmann) :

(Henry Spencer) wrote in message
...
In article ,
Paul Spielmann wrote:

The extent of these problems is much exaggerated, especially by people
who
don't have direct knowledge of space engineering.

I tend to belive this is true. I get the feeling they know more about
mathematical forumlas than what they are really talking about.

In some cases, there are real problems but they are artifacts of current
design practices, which can and should be changed. For example, rocket
engines often experience a great deal of thermal stress during startup,
due to very rapid temperature rises. But there is no fundamental reason
why their startup sequences need to be so fast. Limiting warmup to rates
normally found in jet engines is not a big problem, once designers start
caring about reliability and long life rather than absolute maximum
performance.

I belive that this is the solution. Alot of small changes in our way
of thinking that could make rlvs possible. There should be a website
out there that count up all these small things thats could make rlvs
possible. I think its sad that there are people out there that knows
approaches on how to make rlvs but there really is no good information
source for it??? Where is the websites? Where is the books? I read
armadillo aerospace website witch i think is good, but is there more?

First, you say that you read armadillo aerospace website. Notice that he has
already restarted, and even flew his rocket designs more than once. That
automaticly tells you that rockets can be fired more than once.

Second, most RLV designers are only looking for 10-100 flights before
scrapping a craft. Logical if the the total cost of maintenance and the cost
of the craft total is less then the cost of the same number of flights of
one-shot craft then you are saving money.

Notice you car does not last forever either, but imagine what it would cost
to drive your car if after every trip you needed to buy a new one?

Earl Colby Pottinger

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