A kerosene-fueled X-33 as a single stage to orbit vehicle.
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From: J. Clarke on 29 Mar 2010 18:04 On 3/29/2010 2:16 PM, hallerb(a)aol.com wrote: > On Mar 29, 11:24�am, "J. Clarke"<jclarke.use...(a)cox.net> wrote: >> On 3/29/2010 10:54 AM, hall...(a)aol.com wrote: >> >> >> >> >> >>> On Mar 29, 10:35 am, "Jeff Findley"<jeff.find...(a)ugs.nojunk.com> >>> wrote: >>>> "Marvin the Martian"<mar...(a)ontomars.org> �wrote in messagenews:KMednS79l_rYcDHWnZ2dnUVZ_joAAAAA(a)giganews.com... >> >>>>> On Sun, 21 Mar 2010 17:40:19 -0400, Greg D. Moore \(Strider\) wrote: >>>>>> Because 50,000 feet gets you above the bulk of the atmosphere which >>>>>> provides a decent bonus. >> >>>>> Its trivial. If you knew anything about the subject, you wouldn't have >>>>> said that. >> >>>> Launching from 50k feet gets you above enough of the atmosphere that you can >>>> optimize your rocket engine for vaccuum. This gives you quite a bit more >>>> ISP than the same engine with a sea level optimized nozzle. The difference >>>> here is that your overall stage performance goes up *over the entire flight >>>> of the stage* due to the higher ISP of the engine. >> >>>>> All these people who think that they're so damned smart with all their >>>>> cockeyed ideas, as if they've never been looked at before. >> >>>> These aren't "cokeyeyd" ideas. If you knew *anything* about aerospace >>>> engineering, you'd understand. >> >>>> Jeff >>>> -- >>>> "Take heart amid the deepening gloom >>>> that your dog is finally getting enough cheese" - Deteriorata - National >>>> Lampoon >> >>> Besides with our depency on satellites for everything from TV, to >>> credit card approval a fast replacement satellite to norbit capacity >>> is needed. >> >>> KSC was looking to build a facility for just that, with generic >>> satellites that could be launched from silos within a few days. >> >> Nice idea, if "generic satellites" would do all missions. �Will they? >> And who is going to pay to keep them ready? >> >> Hint--if DirecTV wanted a generic satellite on a hotpad they'd be paying >> somebody to do it already. > > Generic satellites...... > > The sats would be designed for long term storage, FAST activation and > easy stacking, probably on a silo based booster. So is there a "generic" set of requirements published anywhere for a satellite? If it was practical to mass-produce generic satellites that will satisfy all customers don't you think someone would be doing it by now? > This way many companies that MIGHT need a replacement can share the > costs. although since many satellites are covered by insurance this > may pay for fast replacement. So what features does your generic satellite have? Or do you build it with all possible transmitters, receivers, and sensors and park it on top of the uprated Saturn V that you'll need to lug the monster into orbit? > in a critical application the cst although substantial might be trivia > in comparison with lost revenues in case of failure. > > currently much of this is handled by in orbit spares...... > > both direct tv and dish have multiple sats at each main orbital slot, > and usually a older sat just station keeping for redundancy
From: Rick Jones on 29 Mar 2010 18:40 In sci.space.history J. Clarke <jclarke.usenet(a)cox.net> wrote: > So is there a "generic" set of requirements published anywhere for a > satellite? If it was practical to mass-produce generic satellites that > will satisfy all customers don't you think someone would be doing it by now? Sure - it comes in a plain, white container, with no markings except "Satellite" on the outside in plain block letters printed in black. :) http://en.wikipedia.org/wiki/Generic_brand rick jones -- oxymoron n, commuter in a gas-guzzling luxury SUV with an American flag these opinions are mine, all mine; HP might not want them anyway... :) feel free to post, OR email to rick.jones2 in hp.com but NOT BOTH...
From: Greg D. Moore (Strider) on 29 Mar 2010 20:23 Rick Jones wrote: > In sci.space.history J. Clarke <jclarke.usenet(a)cox.net> wrote: > >> So is there a "generic" set of requirements published anywhere for a >> satellite? If it was practical to mass-produce generic satellites >> that will satisfy all customers don't you think someone would be >> doing it by now? > > Sure - it comes in a plain, white container, with no markings except > "Satellite" on the outside in plain block letters printed in black. :) > > http://en.wikipedia.org/wiki/Generic_brand > > rick jones Funny this comes up as this month's issue of Air & Space has an article: http://www.airspacemag.com/space-exploration/Mr-Fix-It.html on Frank Cepollina who sort of proposed a "generic satellite bus". -- Greg Moore Ask me about lily, an RPI based CMC.
From: Pat Flannery on 29 Mar 2010 23:22 On 3/29/2010 2:04 PM, J. Clarke wrote: > So is there a "generic" set of requirements published anywhere for a > satellite? If it was practical to mass-produce generic satellites that > will satisfy all customers don't you think someone would be doing it by > now? That's how commercial comsats are designed. Individual countries purchase satellites of the same design: http://www.ssloral.com/html/satexp/intelsat.html Pat
From: Pat Flannery on 29 Mar 2010 23:25
On 3/29/2010 2:40 PM, Rick Jones wrote: > Sure - it comes in a plain, white container, with no markings except > "Satellite" on the outside in plain block letters printed in black. :) > > http://en.wikipedia.org/wiki/Generic_brand I still like the alcoholic beverage "Drink" out of Repo Man. Pat |