[SpaceProgram] DARPA-RA-11-70 100YSS Notification

[Ian Eyberg]

not to belabor this point but rockets are nothing but a bomb w/a hole in
them

they are expensive, loud, unsafe and a ridiculous way to goto space in

- Ian

On 18:15 Tue 03 Jan     , cole santos wrote:
> Check out JP aerospace luke....they are thinking huge ships. It is
> impractical, however so was atmospheric nitrogen synthesis before
> haber bosch, long distance power transmission before Tesla, etc.
> 
> I think rockets (and other developed tech) is a misplaced goal with
> stratolaunch, spacex, NASA, ect. The things that need our attention
> are the things very few are doing. ie closed arcologies, asteroid
> mineral utilization, solar furnaces, biogas rockets, MHD rockets, etc.
> 
> On Tue, Jan 3, 2012 at 5:59 PM, Luke Weston <reindeerflotilla at gmail.com> wrote:
> > Furthermore, if you want to launch a rocket from some sort of platform
> > carried by a balloon or something - well, it may be practical to do
> > this with a small model rocket or something, but it's going to be
> > highly impractical to carry the weight of any meaningfully large
> > rocket.
> >
> > Cheers,
> >  Luke
> >
> >
> > On Wed, Jan 4, 2012 at 1:49 PM, Atrus <atrus6 at gmail.com> wrote:
> >> Except, there really isn't that much difference in gravity from the surface
> >> of the earth, 10km or in orbit.
> >>
> >> g on the
> >> surface: http://www.wolframalpha.com/input/?i=solve+%5Bg+%3D+%286.67*10%5E-11+*+5.9442*10%5E24%29+%2F+%286378100%29%5E2%2C+g%5D
> >>
> >> g 10km
> >> up: http://www.wolframalpha.com/input/?i=solve+%5Bg+%3D+%286.67*10%5E-11+*+5.9442*10%5E24%29+%2F+%286378100%2B10000%29%5E2%2C+g%5D
> >>
> >> ISS orbit (410 km up)
> >> : http://www.wolframalpha.com/input/?i=solve+%5Bg+%3D+%286.67*10%5E-11+*+5.9442*10%5E24%29+%2F+%286378100%2B410000%29%5E2%2C+g%5D
> >>
> >> This is why launching rockets on a platform will only make the actual launch
> >> more difficult. You still have to reach escape velocity to obtain orbit, the
> >> only thing you would be doing by launching a rocket at a higher altitude
> >> would be the face that you would have to hit that velocity in a shorter
> >> distance.
> >>
> >> Tim Butram
> >>
> >>
> >>
> >> On Mon, Jan 2, 2012 at 7:48 PM, Stuart Young <cefiar at gmail.com> wrote:
> >>>
> >>> On Jan 3, 2012 11:27 AM, "Atrus" <atrus6 at gmail.com> wrote:
> >>> >
> >>> > What exactly is the benefit of having a high altitude launch platform?
> >>> > You would still need to reach essentially the same escape velocity, but only
> >>> > have ~half the distance to achieve that velocity. That seems like a worse
> >>> > trade off (assuming that your perceived benefit is less air resistance).
> >>>
> >>> Benefits (apart from air resistance):
> >>>
> >>> 1. Less gravity to escape (inverse square law).
> >>> 2. Less fuel to carry in the actual rocket (less mass to move to get a
> >>> payload to escape velocity), which should make things simpler (no need for
> >>> multiple stages, simpler avionics).
> >>> 3. Less differences in engine design (high/low atmospheric pressure
> >>> compensation in design not necessary) which simplifies engine and avionics
> >>> design.
> >>>
> >>> And that is just the ones that I can think off of the top of my head.
> >>>
> >>> Btw: Written from my phone, while on site at a client, so pls excuse any
> >>> errors in the text.
> >>>
> >>> --
> >>> Cef
> >>>
> >>>
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> >>>
> >>
> >>
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