From: mark@unicorn.com
Date: Fri Aug 07 1998 - 07:44:44 MDT
Michelle Jones [spike66@ibm.net] wrote:
>mark the reason i am having such difficulty with this concept is that the
>roton is a re-entry system. you still have to lift the thing into orbit
>somehow to reenter the atmosphere.
Uh, Roton is a supposedly low-maintenance SSTO; using rotors significantly
reduces the mass because you don't have to carry a lot of fuel to use for
the landing. A very large part of the cost of government launchers is the
cost of assembling the numerous stages, testing them, building parts with
extremely low probability of failure and then throwing them all away.
An SSTO can in principle be much cheaper because it's not thrown away, it
can land if there's an in-flight failure, and all you need to do to fly
it again is tow it to the launch pad, run the pre-flight checks and
hook up the fuel lines. Obviously with a first-generation it's not going
to be as simple as flying a modern jet, but it should be much simpler
than any expendable launch vehicle in operation today.
So the rotors are a minor point except to the extent that they make it
a workable SSTO.
> the reentry system of modern
>government launchers is neither the cost driver nor the weight driver.
> spike
As far as I'm aware the shuttle's wings add a large amount to the cost
and weight.
Mark
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