SpaceShipOne Flight Test 175
Soft writes "Scaled Composites' entry for the X-Prize, the SpaceShipOne, has had a successful first (unpowered) flight test.
The spacecraft was dropped from the White Knight carrier aircraft at 47,000 ft (14 km) and 105 kt (194 km/h, 120 mph) and touched down after a 1.1-hour glide at Mojave airport.
Photos are available."
Well... (Score:2, Funny)
Re:Well... (Score:1)
SpaceShipOne? (Score:3, Funny)
Read the EULA! (Score:1)
Re:Read the EULA! (Score:2)
Good on them (Score:1)
Rus
Re:Good on them (Score:1)
Flight Time? (Score:5, Informative)
The post refers to a 1.1 hour flight, which shocked me as a rather long glide from 47,000 feet, but after reading the article it seems that total flight duration was 1.1 hours and actual glide time was a more understandable 19 minutes. 19 minutes is still great from that altitude as Nasa's shuttle has a much higher sink rate, despite its greater weight.
Re:Flight Time? (Score:5, Insightful)
Re:Flight Time? (Score:5, Interesting)
Re:Flight Time? (Score:1)
I would argue that weight is irrelevant. However, wingloading is very significant. This is typically measured in lbs / ft2 (thats pounds per square foot). The shuttle's wing loading is very very high, partly due to its high weight, partly due to its relatively small wings.
Wingloading has an impact on sink rate. As wingload goes up, sink rate does as well; i.e. the more work a piece of wing has to do in terms of lifting, the more drag it produces. ergo, higher wing loadings usually equal higher drag.
Re:Flight Time? (Score:3, Interesting)
If I remember coeectly, the SS1 was designed to handle an expected 5.5 G's or so upon "re-entry".
Besides Burt Rutan is a genius, so it has to work. ;)
Re:Flight Time? (Score:3, Informative)
This plane does not have to do a full re-entry into the atmosphere, I think that gives Rutan a bit more leeway in aerodynamic design.
Can it handle re-entry? (Score:1)
Re:Can it handle re-entry? (Score:5, Informative)
Re-entry from orbit involves hitting the atmosphere at almost-orbital speeds - about 17,000+ mph.
SSO is designed to fly SUB-orbital. Its re-entry will be MUCH slower. Scaled Composites' website quotes [scaled.com] a maximum speed of about 2,500 mph. Kinetic heating shouldn't be a major problem at that sort of speed.
Comment removed (Score:5, Interesting)
Re:Can it handle re-entry? (Score:2)
Re:Can it handle re-entry? (Score:3, Informative)
Re:Can it handle re-entry? (Score:5, Informative)
First, the X-price is about creating a sub-orbital craft, not an orbital one. Still, it's a valid question you ask.
Rockets to slow the capsule / spaceship down for rentry purposes has been used on every single manned spaceship I know of. They are called retro-rockets and are employed to initiate re-entry at the proper time and place to put the capsule / spaceship down where it's supposed to come down. The alternative is to stay in orbit until it dacays naturaly, and then who knows how long you will stay up there or where you will come down.
That said, I assume you knew that already and are wondering about rocketengines / other engines that can be used continualy for a logner period of time to brake the craft faster than purely aerodynamic braking can achive?
In theory it is nothing stopping you from trying that - apart from the weight of both engines and fuel. Not only does the rule of thumb tells us that for every kilogram you want to take into orbit, you'll burn ten kilograms of fuel to get it there, but as the engiens and fuel will have to be protected against the heat of re-entry, you nead a larger (thus heavier) heatshield as well as a larger (heavier) craft overall. And that in turns means - you guessed it - that you'll have to burn even more fuel getting it up there.
On the other hand, if you're simply suggesting dropping the relative groundvelocity of the craft to zero before it re-enetered the atmosphere, so it would drop straight down, I see two problems. Firstly, you would have to do it fast (since loss in speed means loss in altitude - thus meeting the atmosphere), which means an allmighty kick in the pants for the poor astronauts (very hight G). Secondly, the heatpulse would be about the same anyway - the craft will have a whooping huge potential energy from simply beeing that high, and that will be converted to kinetic energy (read; speed) on the way down. Remember Epot = mgh while Ekin = 1/2mv, and if we assume that all the potential energy is transformed into kinetic energy (which it ain't, a whole lot will turn into heat), we find that Epot = Ekin, thus mgh=1/2mv. Simplify, and you see that the speed (v) equals the square root of two times the height multiplied with the gravitatinal pull (v=sq(2gh) ). Thus, if we set the height to 100 km (100000 meter) and we assume that g is constant at 9.82ms, we find that the speed of the craft as it reaches the surface is no less than 1401.42 meter a second, equal to 5045kmh, equal to 3136mph, or about 4.25 Mach. So to summarise, you won't save anything by 'stopping' in your orbital tracks.
Re:Can it handle re-entry? (Score:1, Informative)
Re:Can it handle re-entry? (Score:1)
Re:Can it handle re-entry? (Score:3, Interesting)
If you had the reaction mass in orbit as a refueling point, there is no question that this would work. It is out of reach of today's technology with its dependence on chemical rockets, because the cost of hauling the fuel up with you is much too great. But that could change in a hurry, if we happen to find a source of ice that is already up there somewhere...
What I envision is a reentry v
Re:Can it handle re-entry? (Score:1)
You would also need a big big rocket, because you'd have to decelerate rapidly indeed in order to 1) decrease your velocity enough to make it worthwhile, and 2) Get the pointy end back into the wind. On
Orbital Mechanics and re-entry (Score:2)
Orbital mechanics show that there is a direct link between speed and orbit height. If you slow down, your orbit height increases. If you speed up, height decreases. This makes rendevous in space tricky to say the least. The first attempts during gemini were not real successful, but they have it down to an art form now.
So in orbit you have to speed up to get down to the atmosphere. Once you get the atmospheric drag, orbita
Re:Orbital Mechanics and re-entry (Score:1)
That is a really warped version of orbital mechanics you're using.
Yes, a lower orbit means you're moving faster, but speeding up will not move you into a lower orbit.
Imagine a ship in a circular orbit. If it fires thrusters to speed up, its orbit will change shape, into an ellipse, with the "lowest" part of the orbit in line with the circlular orbit. As the craft moves from the lowest part of the orbit to the highest, it will be slowed down by gravity, trading kinetic energy for gravitational potential
SSO and Reentry (Score:4, Informative)
Funny you ask. SSO has a unique design in which the wings fold during re-entry and provide an aerodynamically stable "shuttlecocking" effect such that the belly remains down. This means more drag at higher altitudes, simpler re-entry controll, etc. Then the wing converts pack and the pilot glides the vehicle in. More drag at higher altitudes also means that it is decelleration is more spread out, so the heat (potential energy -> kenetic energy -> heat) is applied at a slower rate and is less of a problem.
It is all there in the FAQ.
Re:SSO and Reentry (Score:2)
Anyone else read that as SCO the first time? I almost jumped out of my chair... what? You mean they've got their grubby fingers in this IP pie too?
Re:SSO and Reentry (Score:2)
Anyone else read that as SCO the first time?
After I wrote this, I realized that SSO was also the acronym for Single Sign On.....
FWIW, SSO is SpaceShipOne, not SCO or Single Sign On
Re: (Score:2)
Re:Can it handle re-entry? (Score:2)
In fact Burt said that the IAS (INDICATED airspeed) never goes above around 180 knots even though the ship
Re:Can it handle re-entry? (Score:1)
While Indicated Air Speed is a very useful number aerodynamically (for working out things like stall speed, aerodynamic loading, and so forth), it's not much help when you're trying to work out things like kinetic heating - for that you need to pay attention to the True Air Speed and Mach Number.
Yes, air density is important - you'll get more heating in denser air - but at equivalent IAS values, you'll get more heating at Mach 3 than at Mach 0.5
That said: SSO won't have to deal with kinetic heating anythi
Re:Can it handle re-entry? (Score:1)
Re:Can it handle re-entry? (Score:1)
So the heat is much smaller than true orbital vehicles.
How will it handle this "benign" reentry ? Its got this funky shuttle cock tail arrangement going, read up on it on original launch day articles.
Anyhow, i hope Carmack, brits or some of canadians will win. "Elite" airship designer working on angel investor budget doesnt convey the tr
Wired Story (Score:2)
Re:From X to One (Score:4, Funny)
That, and we don't mind if they take off every SpaceShipZero for great justice, it's just that we don't want the pilot to have no chance to survive make his time.
Let's go! (Score:2, Interesting)
Re:Let's go! (Score:1, Interesting)
Too bad things don't work like that anymore.
That male bravado won't get you anywhere. You must think, consider, design and re-design the experiments. Then you'll test it unmanned for a few years and THEN you'll let the test pilots to take over.
Re:Let's go! (Score:1)
You left out the part about the IP lawyers who will ensure that this will ultimately get swallowed up in a massive pile of red tape, and drain it of any hope for success.
Sorry about the pessimism, but I lump consumer space flight in with finding a cure for cancer.
--
In my great great grandchildren's lifetime? I'll still doubt it.
Re:Let's go! (Score:3, Insightful)
What, you mean the fact that they're both something that we've made great strides towards in the last 10 years, and both are extremely important to humanity? Good comparison!
Re:Creating life vs. creating technology (Score:4, Insightful)
a.k.a. testoterone poisoning (Score:3, Insightful)
Have you ever noticed that most "darwin award" winners are male?
Re:a.k.a. testoterone poisoning (Score:2)
Are they ANY female Darwin Award winners? Seriously, now that you mention it, I can't think of any.
Imagine how peaceful the world would be without men.
Re:a.k.a. testoterone poisoning (Score:1)
Re:Creating life vs. creating technology (Score:3, Informative)
Blame evolution. Nature, on the communal level, does not favor the timorous. Fret not, the key to the typical woman's reproductive gonads is lots of accumulated possessions...
Precision (Score:3, Funny)
The space ship was launched at 47,000 feet and 105 knots, 10 nm east of Mojave.
How the hell did they measure that? I mean, it has an altitude of 47000 feet and a velocity 105 knots and they tell you it is 10 nanometers east of Mojave!
Re:Precision (Score:4, Informative)
A nautical mile is slightly more than a mile ( I forget the specifics), but 10 nm is roughly 11 miles.
Re:Precision (Score:2)
It is simple: One imperial mile is 1609 meter. One nautical mile is 1852 meter. One kilometer - which is the preferable way to measure distances if you have seen the light of the metric system - is 1000 meter. One norwegian mil is (at least in this day and age) 10000 meter (10 kilometer).
So they dropped it 18520 meters east of Mojave, or about what I would say was roughtly one-point-eight mil away from touchdown.
Re:Precision (Score:3, Informative)
nautical mile A unit of length used in sea and air navigation, based on the length of one minute of arc of a great circle, especially an international and U.S. unit equal to 1,852 meters (about 6,076 feet). Also called sea mile.
Since aeronatical charts have hash marks for each minute of latitude along the north-south lontigude lines, it is easy to pull nm distances off using ruler that are corrected for the map's distortion due to projection.
Re:Precision (Score:1, Insightful)
joke: Something said or done to evoke laughter or amusement, especially an amusing story with a punch line.
Re:Precision (Score:1)
Re:Precision (Score:2)
11 miles, 2 chains, 4 rods, 6 poles, 7 cubits and half a furlong.
Re:Precision (Score:3, Funny)
Re:Precision (Score:2, Funny)
Re:Precision (Score:2, Funny)
When the Greeks reckon time by the kalends?
I took the liberty of re-inserting the portion of the hyphenated phrase which your non-American-made keyboard left out. You're welcome.
Not so short (Score:4, Interesting)
Re:Not so short (Score:5, Interesting)
I don't know how you get to 4 or 5 hours, but i assume you think that it can glide all the way down from 100 km up. Remember however that at that height there is hardly any air to glide in. You thus fall back like a brick, slow down when you hit the upper atmosphere (+- 20 km) and glide for the last part. This will get you more in the 30-45 min range.
Re:Not so short (Score:2)
Wasn't the plan to launch this thing at 60,000 feet or more at 300+ MPH?
Re:Not so short (Score:2, Insightful)
High speed atmospheric flight is obscenely expensive, fuel-wise.
Re:Not so short (Score:2)
Re:Not so short (Score:2, Insightful)
I promise.
promise? (Score:2)
Re:promise? (Score:3, Insightful)
If you can develop a rocket engine that will drive you at "a couple of machs" for, say, two hours, and will fit in SS1's airframe, I'd wager you could make a very large amount of money.
Now things are heating up... (Score:5, Interesting)
The competitors for the X-price [xprice.org] are one after the other dropping their capsules / spaceships out of the sky to test at least part of their re-entry profile, and Burt Rutans entry at least flies like a dream (big surprice - he designs flyingmachiens for a living, don't he?). The X-price is running until January 1, 2005 (qoute; The X PRIZE is fully funded through January 1, 2005, through private donations and backed by an insurance policy to guarantee that the $10 million is in place on the day that the prize is won), giving the teams a little more than one year to launch, overhaul their machines and launch again.
I'm getting all excited over the prosects ahead of us. Never mind if the X-price succeds in jumpstarting the space-tourism or not - we're getting a taste of what the spacerace was like when the USA and the USSR were competing about getting the first man up into space, allthought this time all the teams are playing with open cards.
I'm willing to bet all my karma that we'll have the first launch before next summer; anyone willing to bet against it?
Re:Now things are heating up... (Score:5, Funny)
X-Prize [xprize.org]
There ya go, a working link to the X-Prize site.
I'm sure I will now be modded into oblivion. Enjoy!
Re:Now things are heating up... (Score:1)
The X-Price payable to SCO is 100 Trillion Dollars per X application.
Yours Sincerely, Darl McBride
Boldface 'z' ? (Score:1)
SpaceDev's engine is ready (Score:5, Informative)
SpaceDev Performs Successful Rocket Motor Test [yahoo.com]
Re:SpaceDev's engine is ready (Score:2)
BTW, I see little evidence that any other X-Prize competitors are anywhere near as ready as SpaceShipOne. Or maybe they're the only ones that seem to be building a commercially useful vehicle. Thoughts?
Re:SpaceDev's engine is ready (Score:2)
While they may select one hybrid provider now, testing an engine on the ground is not always the same as testing it in flight (which is why this stuff really IS rocket science).
I'm still boggled that eAc is allowed to perform rocket tests over waterways in Florida (check their test videos). There must be a lot of exemptions near the Cape f
The cool thing about all of this (Score:5, Interesting)
Re:The cool thing about all of this (Score:2)
Re:The cool thing about all of this (Score:2)
Ancient Chinese Curse: May you live in interesting times.
gratz, but... (Score:1, Flamebait)
I wish them and all the contestants success, though.
Re:gratz, but... (Score:2)
Re:gratz, but... (Score:1)
supposing he is just ignorant, he deserves to be modded down for not saying anything worthwhile. he's adding more noise which interferes with the signal, and he needs to learn
Re:gratz, but... (Score:1)
I think not.
I don't feel the craft looks very strong. Am I an aeronautics expert? No. Am I a Structural Engineer? No.
But would I ride in the plane? No.
And am I likely to be given the opportunity to? No.
I wished the team all the success. Just because I wouldn't feel comfortable flying in the craft does not make the post either a troll or a flame.
And I'll bet I'm not the only slashdotter that wouldn't feel comfortable riding in that plane.
Re:gratz, but... (Score:1)
from the FAQ [slashdot.org]
Insightful -- An Insightful statement makes you think, puts a new spin on a given story (or aspect of a story). An analogy you hadn't thought of, or a telling counterexample, are examples of Insightful comments.
Informative -- Often comments add new information to explain the circumstances hinted at by a particular story, fill in "The Other Side" of an argument, provide specifications to a product described too vaguely elsewhere, etc. Such comments
Re:gratz, but... (Score:1)
It was not a prank comment, nor was it intended to provoke ANY response.
But enough of the dickering over moderation. Posts are poorly moderated all the time.
Re:gratz, but... (Score:1)
Ugly (Score:1, Insightful)
------------
Off topic: Could someone get rid of that white dot in the ad banner at the top of the page it's driving me crazy!
Re:Ugly (Score:1)
SS1 could do with a smaller wing, perhaps, but i guess if you wanna fly where there's barely any air you need all the lifting surfaces you can get...
(for a really weird-looking Rutan creation, google for the Boomerang. asymmetr
Re:Ugly (Score:2)
Yup
Re:Ugly (Score:2)
Beauty is in the eye of the beholder, as they say.
Re:Ugly (Score:1)
Question (Score:2)
It is called (Score:4, Informative)
Re:Question (Score:1)
Designed by Burt Rutan, but unfortunately, not a commercial success.
Looks great.... (Score:2)
Re:Looks great.... (Score:1)
Too late. Andy Griffith [geocities.com] already did it in 1979.
Wow, that's fast... (Score:1)
10 nanometres in around an hour? Man, I love progress...
Rutan Interview (Score:2)
http://www.airandspacemagazine.com/ASM/Web/TWD/ru
The most amazing thing is... (Score:1)
snooze (Score:2)
Re:Feh... Old news. (Score:2)
2003-04-19 18:59:53 Private Space Plane Unveiled with Eyes on the X-Pr (articles,space) (rejected)
And it was exactly the same story as above.
Re:Feh... Old news. (Score:3, Informative)
Test flights are test flights, and the space plane neither went orbital or even to the edge of space. It was dropped from the bottom of the White Knight.
Hence my cause for bitching. I submitted several reports of relevence, and not one has been approved (the space flight report was rejected scant seconds after submission).
And similarly, my complaint is on topic, since it covered the above