A kerosene-fueled X-33 as a single stage to orbit vehicle.
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From: Robert Clark on 7 Apr 2010 04:28 On Apr 7, 12:42 am, hcobb <henry.c...(a)gmail.com> wrote: > The fix is to get your air launched rocket into space, but not into > orbit. > > It's a Virgin Galactic style shot that just clears the atmosphere at > roughly zero velocity. > > Then bring in stream of tiny impactors at 60 km/s to power an ablative > rocket and off you go. > > At 60 km/s these impactors have 400 times the energy their mass in TNT > would provide so this is far more energetic than any chemical rocket > could manage. > > Where do you get the 60 km/s? Simply launch the micro-impactors clear > of the Earth and have them slingshot around the Earth a half dozen > times to flip the planes of their orbits around until they're > counterorbital with respect to the Earth and you double Earth's > roughly 30 km/s orbital speed for the impact. > > -HJC Please don't give anyone any ideas about hypersonic bb's in orbit counter rotating to manned craft and satellites. Bob Clark
From: Richard Casady on 7 Apr 2010 07:06 On Wed, 7 Apr 2010 01:28:05 -0700 (PDT), Robert Clark <rgregoryclark(a)yahoo.com> wrote: >On Apr 7, 12:42�am, hcobb <henry.c...(a)gmail.com> wrote: >> The fix is to get your air launched rocket into space, but not into >> orbit. >> >> It's a Virgin Galactic style shot that just clears the atmosphere at >> roughly zero velocity. >> >> Then bring in stream of tiny impactors at 60 km/s to power an ablative >> rocket and off you go. >> >> At 60 km/s these impactors have 400 times the energy their mass in TNT >> would provide so this is far more energetic than any chemical rocket >> could manage. >> >> Where do you get the 60 km/s? �Simply launch the micro-impactors clear >> of the Earth and have them slingshot around the Earth a half dozen >> times to flip the planes of their orbits around until they're >> counterorbital with respect to the Earth and you double Earth's >> roughly 30 km/s orbital speed for the impact. >> >> -HJC > > Please don't give anyone any ideas about hypersonic bb's in orbit >counter rotating to manned craft and satellites. Give someone ideas? I read about that one fifty years ago. Casady
From: Pat Flannery on 7 Apr 2010 10:33 On 4/6/2010 8:42 PM, hcobb wrote: > The fix is to get your air launched rocket into space, but not into > orbit. > > It's a Virgin Galactic style shot that just clears the atmosphere at > roughly zero velocity. > > Then bring in stream of tiny impactors at 60 km/s to power an ablative > rocket and off you go. > > At 60 km/s these impactors have 400 times the energy their mass in TNT > would provide so this is far more energetic than any chemical rocket > could manage. > > Where do you get the 60 km/s? Simply launch the micro-impactors clear > of the Earth and have them slingshot around the Earth a half dozen > times to flip the planes of their orbits around until they're > counterorbital with respect to the Earth and you double Earth's > roughly 30 km/s orbital speed for the impact. So, in other words, you _want_ it to fly into a meteor storm, just like in 1950's sci-fi movies? Pat
From: Keith Willshaw on 7 Apr 2010 08:13 "hcobb" <henry.cobb(a)gmail.com> wrote in message news:881ce296-2434-4c5b-85a9-ac8b44a8665d(a)w17g2000yqj.googlegroups.com... > The fix is to get your air launched rocket into space, but not into > orbit. > > It's a Virgin Galactic style shot that just clears the atmosphere at > roughly zero velocity. > > Then bring in stream of tiny impactors at 60 km/s to power an ablative > rocket and off you go. > > At 60 km/s these impactors have 400 times the energy their mass in TNT > would provide so this is far more energetic than any chemical rocket > could manage. > > Where do you get the 60 km/s? Simply launch the micro-impactors clear > of the Earth and have them slingshot around the Earth a half dozen > times to flip the planes of their orbits around until they're > counterorbital with respect to the Earth and you double Earth's > roughly 30 km/s orbital speed for the impact. > > -HJC > Henry you are a certifiable idiot. 1) The rotational speed of the planet is FAR slower than the velocity of an object in orbit. This is why satellites in low earth object circle the planet in around 90 minutes. 2) Orbital velocity has nothing to do with the planets direction of rotation. Your particles moving at 60km/sec will NOT stay in orbit 3) Momentum is conserved so you gain NOTHING even if your cunning plan could work. 4) Your energetic particles would be put into orbit by a chemical rocket. Keith
From: J. Clarke on 7 Apr 2010 10:05
On 4/7/2010 10:33 AM, Pat Flannery wrote: > On 4/6/2010 8:42 PM, hcobb wrote: >> The fix is to get your air launched rocket into space, but not into >> orbit. >> >> It's a Virgin Galactic style shot that just clears the atmosphere at >> roughly zero velocity. >> >> Then bring in stream of tiny impactors at 60 km/s to power an ablative >> rocket and off you go. >> >> At 60 km/s these impactors have 400 times the energy their mass in TNT >> would provide so this is far more energetic than any chemical rocket >> could manage. >> >> Where do you get the 60 km/s? Simply launch the micro-impactors clear >> of the Earth and have them slingshot around the Earth a half dozen >> times to flip the planes of their orbits around until they're >> counterorbital with respect to the Earth and you double Earth's >> roughly 30 km/s orbital speed for the impact. > > So, in other words, you _want_ it to fly into a meteor storm, just like > in 1950's sci-fi movies? Actually it's a clever concept even though he doesn't seem to have a clue how to actually make the thing work. If I understand his notion correctly he's going to put some kind of big armor plate on his orbiter and then shoot BBs or whatever into the armor plate to provide acceleration. That part is no crazier than GA Orion. The problem is getting the BBs to the necessary velocity and aimed with sufficient accuracy, and his "slingshot around the Earth a half dozen times to flip the planes of their orbits" sounds on the face of it to be nuts. But if you're going to do it that way why bother with the "Virgin Galactic style shot", why not use the BBs for the entire flight? Engineering questions--(1) how do you accelerate and aim the BBs, (2) how much armor plate do you need. |