Hot Rod Job For SpaceShipOne

rwven writes "MSNBC is reporting that the engine on SpaceShipOne has been modified to provide more thrust, for a longer amount of time. Mainly, the Nitrous Oxide tank has increased in size to lengthen the amount of time before the dropoff of thrust when it goes from a liquid to a gas. Also reporting is Space.com."

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In related news...

[nkrumm]

In related news the name of the project has been changed to RiceRocketOne.

Just say N2O

[Doc Ruby]

Using just a nitrous oxide charger and a balloon, I was never higher than low Earth orbit. But with a 60L tank, a garbage bag, and a mattress to jump on, I achieved full astral projection, even interdimensional travel! I recommend a complete crew of 1 extra spotter breathing 21:78:1 O2:N2:Ar2, for a safe return voyage. YMMV.

Re:Oooh

[iamdrscience]

No no, "If you can read this, you're SpaceshipTwo".

Re:Wasting precious resources

[AndroidCat]

The nitrous oxide is the oxidizer, they use rubber for fuel.

SpaceShipOne uses a hybrid rocket engine that uses both liquid and solid propellant to propel it into space. The complete system consists of a liquid nitrous oxide (or laughing gas) oxidizer and a solid form of rubber fuel, which are burned together for about 76 seconds during an average flight, Benson said.

They really are burning rubber into space.

American Spaceship

[ktakki]

I hope the Discovery Channel picks this up next season...


MONDAY

VINNY
Senior says that we have to have this spaceship ready for the X-Prize in November, but I just don't see it happening. We're just halfway through the mock-up and the combustion chamber has to be at the chromers by tomorrow.

TUESDAY

MIKEY
(Takes out the trash)

WEDNESDAY

PAUL, JR.
Whenever we do a theme spaceship, we always run into some problem. Like with this one, the attitude control thrusters were too close to the sissy bar. But Cody came through when he reversed the polarity of the positronic matrix and reconfigured the EPS conduits to emit tachyons through the deflector shields.

THURSDAY

PAUL, SR.
I really had my doubts about this spaceship, but Justin came through in the end. He did a killer job on the tins and the flames and pinstripes on the body really make the design work.


k.

Re:OT: how does NOx work in cars?

[Sooner Boomer]

" Can somebody tell me what nitrous oxide does in a car engine? It's not a flammable gas, is it?"

In a word, oxygen - nitrous contains more oxygen than air and is in a highly dense liquid form. In a car engine, nitrous, along with additional fuel is squirted into the intake. In the hybrid rocket engine, a large cylinder of rubber is the fuel; the nitrous is the oxidizer.

Re:OT: how does NOx work in cars?

[CreateWindowEx]

Since combustion of one unit of gasoline requires more than ten units of air (containing oxygen), most car engines are limited by how much air they can get into the cylinders--it's fairly easy to just squirt more fuel, but to get more air in you have to either force it in with a turbocharger or a supercharger or reduce sources of friction on the way in (lower-restriction air intakes, etc) or fool with cam timing. Nitrous oxide is a cheap and easy way of adding more oxygen for a short period of time, plus it has the added benefit of helping to cool the cylinders, preventing "knocking" (premature ignition of the fuel by "hot spots" in the engine == $$$ if left unchecked).

Usually nitrous oxide systems are set up to inject extra fuel along with the nitrous oxide to keep the correct fuel/oxygen ratio.

As an aside, F&F fans should realize that NOS (Nawz) is the logo of Nitrous Oxide Systems, not a chemical abreviation for nitrious oxide, although they spend a lot of money trying to get their name associated with it.

Re:Wasting precious resources

[Rei]

Yeah. It's an easy fuel/oxidizer combo, but not very scalable. The specific impulse is just too low, and the nitrous tank too heavy. I do find it funny that they described hybrid rocket engines as not being "conventional rockets" ;)

And before some of the posters here start going off on a "Specific impulse isn't everything!" line, I'll add: It's not everything, but it is *incredibly* important. And if you can't have lightweight tanks to compensate for your loss of specific impulse (which you can't with nitrous), you're not going to scale. Plus, using a carrier launch, you're not going to handle the spiralling mass increase very well.

In short, this type of design, while great for getting the X-prize (it's very simple - self pressurizing, no liquid/liquid combustion, etc), would never scale to orbit. I'd like to see a good tow-launch LOX/subcooled propane rocket; that should be scalable and yet still take advantage of air breathing power to get to altitude, and wouldn't have to deal with LH.

What everyone hopes for are some of the things that are on the horizon, that have high ISP without the various tank mass or cryogenic limitations. For example, alane (stabilized aluminum hydride) hybrid boosters, which have an ISP that even with a weaker oxidizer like H2O2, nears LOX/LH's isp, and a very high density. Everyone in rocketry would like such a panacea; however, for now, everyone has different opinions on what is the best way to go.

Re:Oooh

[errxn]

Don't forget the obligatory "Calvin taking a whiz on the NASA logo" sticker.