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User: starbird

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  1. Re:is it REALLY an "Aircraft"? on NASA to Attempt Mach 10 Flight Next Week · · Score: 1

    An aircraft carries its own fuel (propellant), but takes oxygen from the atmosphere, which this aircraft does (it is being boosted to mach 10 on a rocket, but once the booster falls off it will be run under its own power, compressing oxygen in the thin atmosphere and mixing it with its own propellant). A rocket carries its own propellant and oxidizer.

    The oxidizer can be liquid oxygen, peroxide or even vulcanized rubber. Whatever will let the propellant burn.

  2. Re:What is the Speed of Sound? on NASA to Attempt Mach 10 Flight Next Week · · Score: 1

    There is no sound in space, but as other people have mentioned this is not a spaceplane. It is still flying through the atmosphere, even at 110,000ft. At the speeds it will be flying there is enough oxygen around for it to compress and use as oxidizer for its scramjet engine.

  3. Re:Hobby vs Home on FCC Approves BPL Despite Interference Concerns · · Score: 5, Insightful

    Its a hobby until the area you are in is devastated and all other communication channels are down.

  4. Re:What's wrong with PDFs? on Microsoft Can't DRM Docs Fast Enough · · Score: 1

    In OS X you can save anything as PDF. PDF encoding is built into the OS.

  5. Re:Roll all the way on SpaceShipOne to Attempt Second Flight on Monday · · Score: 2, Informative

    There is only 1 rocket nozzle.

    The theory is the roll was started by upper level winds, which was correctable. Mellville says he stepped on a rudder pedal a bit too agressively which started the unrequested roll.

    If you look at the design, the rudders are above the thrust line. If you give a rudder input, you will get a roll in the same direction. Its like having built in dihedral. Once the roll started, they were in the upper stmosphere. The aero surfaces would be pretty much ineffective, but the RCS would not be strong enough yet to control the craft. By that time the feathering system could be opened, and any roll/yawing moments would be dampened as the craft comes back into thicker atmosphere. You even see the pilot stop fiddling with the controls once the roll was slowed and start taking pictures.

    You could ask 'well why not put the wings and vertial stabs in line with the thrust line?" My thinking is that you want the weight further below the line so that on reentry it will want to come down right side up. It would help it be more stable on the way down and make sure the craft reenters at the corect attitude (rather than inverted or backward).

  6. Re:Not surprising on Slack LCD TV Market Means Cheaper Phones And Monitors · · Score: 2, Insightful

    Thats how I see it. Unless your living in an apartment the size of a jail cell, there doesn't seem to be much incentive to buying an overpriced small tv.

  7. Another interesting home networking gadget on NIST Unveils Chip-scale Atomic Clock · · Score: 3, Interesting

    When can I buy a netgear networkable home atomic clock box? Plug it in to your network, and use it to update the times on all your systems, instead of pinging NTP servers.

    Or put it on a pci card, I can just put it in my router box.