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SpaceShipOne Back in Action
JoeSilva writes "After a 3 month wait,
Scaled Composites' SpaceShipOne is
back in the skies above Mojave! Not only is it patched up from a failed landing gear, it's got a 'thermal protection system' installed.
Looks like high temp insulation on the leading edges. Also they have a picture of it with 'the rocket motor for the flight 13p'. This was the 12th SpaceShipOne flight."
Looks like the flight was a few days ago (March 11) - why is this the first report? They're being very quiet about this. And how did Joe Silva track this down?
Energy: time to change the picture.
While you are there check out the Global Flyer It is just as cool in my book. The similarity in the designs of the craft are interesting. The idea of flying around the world on one tank of gas is pretty wild.
It's hard to believe that's how Micronians are made. Why don't we see it right now by having you both kiss one another?
Of course, the project we have to compare it to is John Carmack's Armadillo Aerospace venture (since they have the decency to provide week-by-week status reports, which I consider manditory Monday reading). The folks at Armadillo are still working on getting their engines to light reliably (extra important since they're using five of them) and still haven't had anything like a successful test flight.
I dunno, man -- If I'm Carmack, I'm thinking it's time to really get at it if you're still serious about winning the X-prize. The SpaceShipOne folks seem to be putting them further and further into the rear-view. Which isn't to say they *can't* catch up; if the Armadillo team can get their engines lighting reliably, they should be about ready to bolt the thing together and start flying.
Man, this beats the heck out of money pits like the ISS, eh? Nothing like a little old fashioned get-the-prize competition to turn up some interesting stuff. Maybe a $100 billion prize for the first company to land people on Mars and bring them back ought to be next -- get the government to cooperate with permits and NASA to share their tech. I'd bet you'd see people there inside a decade.
Every year during my review, I just pray the words "slashdot.org" aren't mentioned.
Also, IMHO the ship looks like some high-school science project with way to much duct-tape with the leading edges done the way they have it.
Apparently, Scaled Composites is one of two teams to have applied for a permit from the FAA to launch a spaceflight. The other is Armadillo Aerospace, run by John Carmack of Doom fame. It's interesting to compare and contrast the two companies. Rutan has a sleek ship with lots of cool round windows that launches from a funky big plane, and they have some good solid live testing. The Armadillo team's site really shows you the nitty-gritty of building something that flies in your spare time, with pictures of them welding engines together, making a crew capsule out of whatever they could find, and building a landing gear with some thick cable springs. I'm guessing that Rutan will win, but I'll hold out hope that the garage engineer can pull off at least some type of flight to give courage to that old entrepreneurial spirit....
They better not have any more delays like that last one, if they want to win the X-Prize. The $10 million dollar prize expires at the end of this year, and a lot of other groups are competing for it.
I think we'll see some exciting new developments in space technology over the next few years. I'm confident someone will win the X-Prize,(which is more a PR bonus for starting a space tourism company than anything else) the Bush Admin wants to send folks to the moon or Mars (probably using nuclear propulsion), and it's all but a foregone conclusion that someone will try to build a Space Elevator soon.
Rutan and Scaled are prob the Ultimate Gargage Engineers. He's done stuff that "experts" called impossible for years.
/.ed)
The "early" kit planes he designed are still works of "art".
(bad news, the site is
Uh, bullshit.
Cryogenic hydrogen/oxygen (LOX/LH2) is about the best you can get without big handling difficulties. You can go with flourine combos, but that only nets another 3%-4% ISP with truely horrid handling problems.
There's no "improvement of 2 or 3 orders of magnitude" coming anywhere.
And LH2 has the problem with needing huge tanks because it's so non-dense. If you consider tank size, you can actually get more into orbit on a smaller/lighter vehicle using LOX/kerosene like the Saturn V. The smaller & lighter tanks offset the lower ISP.
I wouldn't worry too much. Rutan seems to be putting on a show more than actually at a "space capable" stage. IIRC, the X-Prize requires that the craft reach 100KM. Rutan's craft has only reached ~14Km, about where a 747 flies. Actual LEO is really 200km - 1500km.
FWIW, it looks like Carmack is taking the time to understand his engines before shooting them off and hoping they fly. This is particularly important since his Monoprop fuel has an Isp of a mere 160. (Shuttle SRBs get 250, and LHOx like the Shuttle main engines get 450.)
Javascript + Nintendo DSi = DSiCade
How do you know how what sort of cooling mechanism is in place or how effective the heat shield will be? Just looking at pictures? For all you know there could be some elaborate fluid cooling system internally distributed, making blunt edges less necessary. Or that heat shield could be more effective than what your extensive calculations and research indicate.
My point is is that you shouldn't be so quick to judge. Or maybe you're just shoehorning some semi-related facts in an insightful-sounding post to raise your karma.
(btw I am an aeronautical engineering major)
I don't have every answer, but here are a few facts:
...
You've got it right on the heat dissipation, though I mentioned that more to address comments that all the heat would be "taken" along the leading edges of the wings, which isn't the case even though they do tend to get pretty hot - which you can see in infrared pictures of the Shuttle as it descends.
This isn't an orbital vehicle, no. A flight will take around half an hour and it'll reach an altitude of 100km or so - across the official space boundary, but it won't stay there long. A lot more fuel would be required to reach orbital velocity, and a lot more heat shielding to make it back.
Re-entry profiles are usually "corridors" only a few degrees wide; come in too shallow, and you skip off the atmosphere; too steep, and you're crushed by G forces. The exact profile differs from design to design, I'd imagine.
Most of the envelope is determined by fuel and the shape of your ship. Amazing things can be done by designing your vehicle well and taking advantage of physics... take a look at the Sanger skip bomber", a suborbital craft designed to fly once around the world and make an unpowered glide landing, "skipping" off the atmosphere like a stone off water.
Notice how flat the underside of the spacecraft is
i am a soviet space shuttle