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    NASA Space elevator feasibility; split from: NASA Announces New Launch Vehicle and CEV

    Ok, theoretically, that COULD work. However, the anchor would have to be ACTIVELY swung at a VERY high rotational rate requiring ENORMOUS amounts of energy to keep it spinning. However, this is what I like to call the difference between where physicists live, and where engineers live. Why...
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    NASA Space elevator feasibility; split from: NASA Announces New Launch Vehicle and CEV

    All orbits MUST lie in a plane which intersects the center of mass of the massive body (in this case, the Earth). An object in orbit about the north pole must pass over the south pole (and vice versa). The ribbon connecting the other anchoring mass would be wrapped around the Earth due to the...
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    NASA Space elevator feasibility; split from: NASA Announces New Launch Vehicle and CEV

    ... (Psst... just because the people work for a place who's name ends in "national laboratory" doesn't mean they have a direct pipeline to the wisdom of the ages. In fact, they are just as likely to be wrong as anyone else... I know... I work with these people from time to time.) ...
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    NASA Space elevator feasibility; split from: NASA Announces New Launch Vehicle and CEV

    I gots some numbers I just tried to post this and my browser crapped out on me... f'ing FireFox... anywho... here it is in condensed form because I don't feel like retyping it all... SkepticJ... your 'space fountain' is crap. Your grandchildren's grandchildren's grandchildren won't see it...
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    Does anyone have any liquid fuel rocket plans?

    I suggest you don't listen to Ki Man. HE can stand 50 feet away... I would stand at LEAST 50 m away. Remember... when the shuttle launches, there are the astronauts inside... and nobody else for 3 MILES! Cheers...
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    NASA Space elevator feasibility; split from: NASA Announces New Launch Vehicle and CEV

    Yeah, they'll have those right after they have satellites that can scratch your ass with a laser beam from space. Cheers...
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    Triangles, Bridges And Centripetal Space Habitats

    To a degree this could help. However, there is a limit to the angular velocity with which a ring can safely rotate. There are tangental and normal stresses that are imparted on a spinning disk. So a strut system could help distribute the stresses due to rotation. FYI: This is why you...
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    Solar Sail Spacecraft

    Yep. Looks like they did. [Broken] The reason you can launch that much payload on a converted ballistic missile is due to the fact that the Russian's nukes were always heavier than ours (and why their manned rocket...
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    Why Harrier didn't success?

    A series of poor design decisions plagued the Harrier... 1) It had only a single engine to power EVERYTHING, including the ducts for vertical landing. So if the engine failed while hovering or landing, with no horizontal velocity to generate lift, that pesky gravity would bring them down...
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    Space Shuttle moon orbit

    Oh, PLEASE tell me you're joking! That movie ranks right up there with 'The Core' and 'Ghosts of Mars' as the movies that break the most laws of physics. Seriously, a group of friends and I made up a 'Mission to Mars' drinking game. Whenever they do anything that involves unsound...
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    Space Shuttle moon orbit

    Well... if money weren't an option, you could put a '72 Pinto Hatchback into orbit, to the moon, or to the stars... If you're asking what the LEAST expensive way to do it would be, then I'd have to say Launch-to-LEO-to-LLO-to-Land with hook-up and staging. That way existing launch vehicles...
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    Pipeline To Space?

    What is going to power these pumps?
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    Pipeline To Space?

    I second that. Cheers...
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    Pipeline To Space?

    So it can't be any smaller than a skyhook, because you have "stations" hanging onto it at regular intervals. These are effectively the same as "cars" on a skyhook. Your point that it could be smaller is now moot. Cheers...
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    Pipeline To Space?

    So all the pumping is going to be done from the surface of the Earth? Run a quick pressure analysis and see what kind of pressures that is going to require near the bottom. Then see just how many CNT layers you need to contain that via thin wall pressure vessel. Your OD may surprise you...
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    Pipeline To Space?

    Ugh... No, you cannot use hydrogen as the propellant for an ion engine. You can use hydrogen as the propellant for a VASIMR (VAriable Specific Impulse Magnetoplasma Rocket). Now... How many ways do I have to say it? This pipeline would never be built, even if it could be. Is it a...
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    Disaster relief blimps: case made

    Why don't people build blimps... Well, there are two big reasons... 1) The Hindenberg disaster is still the most common thing people think of when you say the word "blimp" (except maybe Goodyear tires). It may sound stupid, but to this day people in the US do not trust nuclear power due...
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    Pipeline To Space?

    Well, then it won't work. A skyhook of any sort has to have it's free end in a very narrow band of altitude in order to remain stable... you can't be raising and lowering it. The inside of both of the World Trade Center towers were no fly zones, but things still flew inside of them. Two...
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    Pipeline To Space?

    Why not make it hollow? Because then it is a completely different engineering animal altogether. A skyhook needs only to support the vertical loads associated with the gravitational attraction of the planet it is located upon (as well as some minor off-axis forces). Making it hollow and...
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    Pipeline To Space?

    I think we're neglecting the major issue here... CNTs cannot be made of the length you are specifying, errorist. Providing that they could, how many would you need to string side by side in order to build this pipe? Run a quick hoop stress analysis on the kind of maximum pressure you would...
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    Pipeline To Space?

    If you can build me a single carbon nano-tube 18000 miles long... then I've got some nice real estate to sell you. Better yet, show me a CNT just ONE mile long. Even better still, show me a CNT 1000 feet long. Sorry to burst bubbles, but there are serious hurdles to overcome before we...
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    A traveling-wave engine to power deep space travel

    I agree, what's the big deal with radioactive materials in space??? This traveling wave generator is a novel idea, don't discard it just because it has the taboo "radio-" prefix in it's description. What's wrong with using radioactive power sources, like the SAFE fission reactor or any of the...
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    Resistence of wings on commercial airliners

    I know Boeing tests all their wings to destruction. But I think they only do it in bending, since that is the weakest failure mode of the wing. Search Boeing's site, and I think you'll have better results with getting information.
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    Satellite guided airship

    I don't know about your floating platform idea, but I think I know how to fix the windage problem. Just design your control system such that it has zero steady state tracking errors for constant disturbance forces. I would imagine a well designed PD or PID controller could work. See any...
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    Space elevator and ionoshphere

    Always remember that something appearing in print has no relevance on its being true or not.
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    Harder than any other

    Apples and Oranges Comparing different branches of engineering is like comparing apples and oranges. Although I am an aerospace engineer, there are other branches that I think have harder areas than aerospace. For instance, electrical engineers know worlds more about communications and...